C#窗体应用程序调用C++动态链接库（dll）
最近完成了一个项目，项目难度不大，但是过程中还是遇到了一些问题，特此记录下来，以备不时之需。该项目实现了MCU控制一些LED灯的状态，这个很简单无需多讲，MCU是通过串口通讯接收上位机APP的指令，然后再去根据指令执行控制LED的动作的。上位机APP是通过C#写的，其实C#有自带的串口控件，最简单的方式是直接利用这个控件来实现通讯，但是为了方便客户的开发，我还是决定做成一个可以调用的动态链接库（DLL）来实现，后期用户只需要参考我们的APP调用这个DLL就可以了。下面将讲解如何完成DLL和APP的编写，以及过程中遇到的一些问题。
1.动态链接库（dll）：
1.1 创建新项目
这里我使用的是VS2019，界面跟之前的版本有所不同：
这样，一个工程就建好了，接下来编写代码。
1.2 代码编辑：
1.2.1 创建好的项目中自带一个dllmain.cpp文件，这个文件一般情况下不需要更改。
1.2.2 需要创建其他源文件或者头文件，可以右击“解决方案资源管理器”这一栏中的“源文件”或“头文件”，选择“添加”，选择“新建项”。在本次项目中增加了4个文件，“WzSerialPort.h”，“WzSerialPort.cpp”，“SBC7835_DLL.cpp”,“SBC7835_DLL.h”,其中“WzSerialPort.h”和“WzSerialPort.cpp”是实现串口通讯功能的源文件和头文件，“SBC7835_DLL.cpp”,“SBC7835_DLL.h”是应用层的代码，是自定义的数据格式以及串口的开启及关闭：
WzSerialPort.cpp：
#include "pch.h"
#include "WzSerialPort.h"
#include <stdio.h>
#include <string.h>
#include <WinSock2.h>
#include <windows.h>
WzSerialPort::WzSerialPort()
{
}
WzSerialPort::~WzSerialPort()
{
}
bool WzSerialPort::open(const char* portname,
int baudrate,
char parity,
char databit,
char stopbit,
char synchronizeflag)
{
this->synchronizeflag = synchronizeflag;
HANDLE hCom = NULL;
if (this->synchronizeflag)
{
//同步方式
hCom = CreateFileA(portname, //串口名
GENERIC_READ | GENERIC_WRITE, //支持读写
0, //独占方式，串口不支持共享
NULL,//安全属性指针，默认值为NULL
OPEN_EXISTING, //打开现有的串口文件
0, //0：同步方式，FILE_FLAG_OVERLAPPED：异步方式
NULL);//用于复制文件句柄，默认值为NULL，对串口而言该参数必须置为NULL
}
else
{
//异步方式
hCom = CreateFileA(portname, //串口名
GENERIC_READ | GENERIC_WRITE, //支持读写
0, //独占方式，串口不支持共享
NULL,//安全属性指针，默认值为NULL
OPEN_EXISTING, //打开现有的串口文件
FILE_FLAG_OVERLAPPED, //0：同步方式，FILE_FLAG_OVERLAPPED：异步方式
NULL);//用于复制文件句柄，默认值为NULL，对串口而言该参数必须置为NULL
}
if (hCom == (HANDLE)-1)
{
return false;
}
//配置缓冲区大小
if (!SetupComm(hCom, 1024, 1024))
{
return false;
}
// 配置参数
DCB p;
memset(&p, 0, sizeof(p));
p.DCBlength = sizeof(p);
p.BaudRate = baudrate; // 波特率
p.ByteSize = databit; // 数据位
switch (parity) //校验位
{
case 0:
p.Parity = NOPARITY; //无校验
break;
case 1:
p.Parity = ODDPARITY; //奇校验
break;
case 2:
p.Parity = EVENPARITY; //偶校验
break;
case 3:
p.Parity = MARKPARITY; //标记校验
break;
}
switch (stopbit) //停止位
{
case 1:
p.StopBits = ONESTOPBIT; //1位停止位
break;
case 2:
p.StopBits = TWOSTOPBITS; //2位停止位
break;
case 3:
p.StopBits = ONE5STOPBITS; //1.5位停止位
break;
}
if (!SetCommState(hCom, &p))
{
// 设置参数失败
return false;
}
//超时处理,单位：毫秒
//总超时＝时间系数×读或写的字符数＋时间常量
COMMTIMEOUTS TimeOuts;
TimeOuts.ReadIntervalTimeout = 1000; //读间隔超时，该时间为串口每次接收等待的时间间隔，数据不多可以把该时间改小，这里每次等待1000mS间隔
TimeOuts.ReadTotalTimeoutMultiplier = 500; //读时间系数
TimeOuts.ReadTotalTimeoutConstant = 5000; //读时间常量
TimeOuts.WriteTotalTimeoutMultiplier = 500; // 写时间系数
TimeOuts.WriteTotalTimeoutConstant = 2000; //写时间常量
SetCommTimeouts(hCom, &TimeOuts);
PurgeComm(hCom, PURGE_TXCLEAR | PURGE_RXCLEAR);//清空串口缓冲区
memcpy(pHandle, &hCom, sizeof(hCom));// 保存句柄
return true;
}
void WzSerialPort::close()
{
HANDLE hCom = *(HANDLE*)pHandle;
CloseHandle(hCom);
}
int WzSerialPort::send(const void* buf, int len)
{
HANDLE hCom = *(HANDLE*)pHandle;
if (this->synchronizeflag)
{
// 同步方式
DWORD dwBytesWrite = len; //成功写入的数据字节数
BOOL bWriteStat = WriteFile(hCom, //串口句柄
buf, //数据首地址
dwBytesWrite, //要发送的数据字节数
&dwBytesWrite, //DWORD*，用来接收返回成功发送的数据字节数
NULL); //NULL为同步发送，OVERLAPPED*为异步发送
if (!bWriteStat)
{
return 0;
}
return dwBytesWrite;
}
else
{
//异步方式
DWORD dwBytesWrite = len; //成功写入的数据字节数
DWORD dwErrorFlags; //错误标志
COMSTAT comStat; //通讯状态
OVERLAPPED m_osWrite; //异步输入输出结构体
//创建一个用于OVERLAPPED的事件处理，不会真正用到，但系统要求这么做
memset(&m_osWrite, 0, sizeof(m_osWrite));
m_osWrite.hEvent = CreateEvent(NULL, TRUE, FALSE, L"WriteEvent");
ClearCommError(hCom, &dwErrorFlags, &comStat); //清除通讯错误，获得设备当前状态
BOOL bWriteStat = WriteFile(hCom, //串口句柄
buf, //数据首地址
dwBytesWrite, //要发送的数据字节数
&dwBytesWrite, //DWORD*，用来接收返回成功发送的数据字节数
&m_osWrite); //NULL为同步发送，OVERLAPPED*为异步发送
if (!bWriteStat)
{
if (GetLastError() == ERROR_IO_PENDING) //如果串口正在写入
{
WaitForSingleObject(m_osWrite.hEvent, 1000); //等待写入事件1秒钟
}
else
{
ClearCommError(hCom, &dwErrorFlags, &comStat); //清除通讯错误
CloseHandle(m_osWrite.hEvent); //关闭并释放hEvent内存
return 0;
}
}
return dwBytesWrite;
}
}
int WzSerialPort::receive(void* buf, int maxlen)
{
HANDLE hCom = *(HANDLE*)pHandle;
//if (this->synchronizeflag)
//{
// //同步方式，这里因为发送用了同步，接收想用异步，又没有重新初始化串口打开，就直接注释掉用串口异步接收了
// DWORD wCount = maxlen; //成功读取的数据字节数
// BOOL bReadStat = ReadFile(hCom, //串口句柄
// buf, //数据首地址
// wCount, //要读取的数据最大字节数
// &wCount, //DWORD*,用来接收返回成功读取的数据字节数
// NULL); //NULL为同步发送，OVERLAPPED*为异步发送
// if (!bReadStat)
// {
// return 0;
// }
// return wCount;
//}
//else
{
//异步方式,用同步会阻塞
DWORD wCount = maxlen; //成功读取的数据字节数
DWORD dwErrorFlags; //错误标志
COMSTAT comStat; //通讯状态
OVERLAPPED m_osRead; //异步输入输出结构体
//创建一个用于OVERLAPPED的事件处理，不会真正用到，但系统要求这么做
memset(&m_osRead, 0, sizeof(m_osRead));
m_osRead.hEvent = CreateEvent(NULL, TRUE, FALSE, L"ReadEvent");
ClearCommError(hCom, &dwErrorFlags, &comStat); //清除通讯错误，获得设备当前状态
if (!comStat.cbInQue)return 0; //如果输入缓冲区字节数为0，则返回false
BOOL bReadStat = ReadFile(hCom, //串口句柄
buf, //数据首地址
wCount, //要读取的数据最大字节数
&wCount, //DWORD*,用来接收返回成功读取的数据字节数
&m_osRead); //NULL为同步发送，OVERLAPPED*为异步发送
if (!bReadStat)
{
if (GetLastError() == ERROR_IO_PENDING) //如果串口正在读取中
{
//GetOverlappedResult函数的最后一个参数设为TRUE
//函数会一直等待，直到读操作完成或由于错误而返回
GetOverlappedResult(hCom, &m_osRead, &wCount, TRUE);
}
else
{
ClearCommError(hCom, &dwErrorFlags, &comStat); //清除通讯错误
CloseHandle(m_osRead.hEvent); //关闭并释放hEvent的内存
return 0;
}
}
return wCount;
}
}
WzSerialPort.h:
#pragma once
#ifndef _WZSERIALPORT_H
#define _WZSERIALPORT_H
class WzSerialPort
{
public:
WzSerialPort();
~WzSerialPort();
// 打开串口,成功返回true，失败返回false
// portname(串口名): 在Windows下是"COM1""COM2"等，在Linux下是"/dev/ttyS1"等
// baudrate(波特率): 9600、19200、38400、43000、56000、57600、115200
// parity(校验位): 0为无校验，1为奇校验，2为偶校验，3为标记校验（仅适用于windows)
// databit(数据位): 4-8(windows),5-8(linux)，通常为8位
// stopbit(停止位): 1为1位停止位，2为2位停止位,3为1.5位停止位
// synchronizeflag(同步、异步,仅适用与windows): 0为异步，1为同步
bool open(const char* portname, int baudrate, char parity, char databit, char stopbit, char synchronizeflag = 1);
//关闭串口，参数待定
void close();
//发送数据或写数据，成功返回发送数据长度，失败返回0
int send(const void* buf, int len);
//接受数据或读数据，成功返回读取实际数据的长度，失败返回0
int receive(void* buf, int maxlen);
private:
int pHandle[16];
char synchronizeflag;
};
#endif
SBC7835_DLL.cpp：
// SBC7835_DLL.cpp : 定义 DLL 应用程序的导出函数。
//
#include "pch.h"
#include "SBC7835_DLL.h"
WzSerialPort w;
uint8_t Check(uint8_t data[], uint8_t len)
{
uint32_t sum = 0;
uint8_t ret;
for (uint8_t i = 0; i < len; i++)
{
sum += data[i];
}
ret = sum / len;
return ret;
}
bool SBC7835_OpenCOM(const char* portname)
{
return w.open(portname, 115200, 0, 8, 1);
}
int SBC7835_CtrlLEDS(uint32_t color)
{
uint8_t sendData[6];
uint8_t recData[6];
int ret = 0;
sendData[0] = 0xAA;
sendData[1] = AllLEDCtrl;
sendData[2] = color >> 16;
sendData[3] = color >> 8;
sendData[4] = color;
sendData[5] = Check(sendData, 5);
ret = w.send(sendData, 6);
if (ret != 6)
{
return ret;
}
else
{
/*Sleep(10);
ret = w.receive(recData, 6);
if (ret != 6)
{
return false;
}
for (int i = 0; i < 6; i++)
{
if (recData[i] != sendData[i])
return false;
}*/
return ret;
}
}
bool SBC7835_CtrlOneLED(uint8_t num, uint8_t color)
{
uint8_t sendData[6];
uint8_t recData[6];
int ret = 0;
sendData[0] = 0xAA;
sendData[1] = OneLEDCtrl;
sendData[2] = num;
sendData[3] = color;
sendData[4] = 0xff;
sendData[5] = Check(sendData, 5);
ret = w.send(sendData, 6);
if (ret != 6)
{
return false;
}
else
{
/*Sleep(10);
ret = w.receive(recData, 6);
if (ret != 6)
{
return false;
}
for (int i = 0; i < 6; i++)
{
if (recData[i] != sendData[i])
return false;
}*/
return true;
}
}
SBC7835_DLL.h
#ifndef SBC7835_DLL_H #define SBC7835_DLL_H #include "pch.h" #include <iostream> #include "WzSerialPort.h" #include "Windows.h" #ifdef SBC7835_EXPORTS #define SBC7835_API __declspec(dllexport) //声明为DLL导出函数的宏定义 #else #define SBC7835_API __declspec(dllimport) #endif #define OneLEDCtrl 0x01 #define AllLEDCtrl 0x02 uint8_t Check(uint8_t data[], uint8_t len); extern "C" SBC7835_API bool SBC7835_OpenCOM(const char* portname); extern "C" SBC7835_API int SBC7835_CtrlLEDS(uint32_t color); extern "C" SBC7835_API bool SBC7835_CtrlOneLED(uint8_t num, uint8_t color); #endif
__declspec(dllexport)与__declspec(dllimport)是DLL内的关键字，表示导出和导入。
dllexport是在这些类、函数以及数据的申明的时候使用。用他表明这些东西可以被外部函数使用，即（dllexport）是把 DLL中的相关代码（类，函数，数据）暴露出来为其他应用程序使用。使用了（dllexport）关键字，相当于声明了紧接在（dllexport）关键字后面的相关内容是可以为其他程序使用的。
dllimport是在外部程序需要使用DLL内相关内容时使用的关键字。当一个外部程序要使用DLL 内部代码（类，函数，全局变量）时，只需要在程序内部使用（dllimport）关键字声明需要使用的代码就可以了，即（dllimport）关键字是在外部程序需要使用DLL内部相关内容的时候才使用。（dllimport）作用是把DLL中的相关代码插入到应用程序中。
_declspec(dllexport)与_declspec(dllimport)是相互呼应，只有在DLL内部用dllexport作了声明，才能在外部函数中用dllimport导入相关代码。
C#调用dll：
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using System.Runtime.InteropServices; using System.IO.Ports; namespace SBC7835_APP { public partial class SBC7835 : Form { [DllImport("SBC7835_DLL.dll", EntryPoint = "SBC7835_OpenCOM", CallingConvention = CallingConvention.Cdecl)] public static extern bool SBC7835_OpenCOM(string portname); [DllImport("SBC7835_DLL.dll", EntryPoint = "SBC7835_CtrlLEDS", CallingConvention = CallingConvention.Cdecl)] public static extern bool SBC7835_CtrlLEDS(UInt32 color); [DllImport("SBC7835_DLL.dll", EntryPoint = "SBC7835_CtrlOneLED", CallingConvention = CallingConvention.Cdecl)] public static extern bool SBC7835_CtrlOneLED(byte num, byte color); int Count = 0; const byte LED1 = 0; const byte LED2 = 1; const byte LED3 = 2; const byte LED4 = 3; const byte LED5 = 4; const byte LED6 = 5; const byte LED7 = 6; const byte LED8 = 7; const byte LED9 = 8; const byte LED10 = 9; const byte LED11 = 10; const byte LED12 = 11; const byte LED_OFF = 0x00; const byte LED_RED = 0x01; const byte LED_GREEN = 0x02; const byte LED_BLUE = 0x03; public SBC7835() { InitializeComponent(); string[] PortName = SerialPort.GetPortNames(); for(int i = 0;i<PortName.Count();i++) { SerialPort_comboBox.Items.Add(PortName[i]); } LED1_comboBox.SelectedIndex = 0; LED2_comboBox.SelectedIndex = 0; LED3_comboBox.SelectedIndex = 0; LED4_comboBox.SelectedIndex = 0; LED5_comboBox.SelectedIndex = 0; LED6_comboBox.SelectedIndex = 0; LED7_comboBox.SelectedIndex = 0; LED8_comboBox.SelectedIndex = 0; LED9_comboBox.SelectedIndex = 0; LED10_comboBox.SelectedIndex = 0; LED11_comboBox.SelectedIndex = 0; LED12_comboBox.SelectedIndex = 0; } void OpenCOM() { string Com = SerialPort_comboBox.Text; try { if (SBC7835_OpenCOM(Com) != true) { MessageBox.Show("SBC7835 Open COM Failed!", "Warning"); } } catch (Exception ex) { MessageBox.Show("SBC7835 Open COM Error:" + ex.ToString(), "ERROR"); } } private void Manual_button_Click(object sender, EventArgs e) { UInt32 color = 0; if (LED_OFF_radioButton.Checked == true) color = 0; else if (LED_RED_radioButton.Checked == true) color = 0x555555; else if (LED_GREEN_radioButton.Checked == true) color = 0xAAAAAA; else if (LED_BLUE_radioButton.Checked == true) color = 0xFFFFFF; try { if (SBC7835_CtrlLEDS((UInt32)color) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(),"ERROR"); } } private void Auto_button_Click(object sender, EventArgs e) { timer1.Interval = 1000; timer1.Start(); } private void timer1_Tick(object sender, EventArgs e) { UInt32 color = 0; Count++; if (Count >= 4) Count = 0; if (Count == 0) color = 0; else if (Count == 1) color = 0x555555; else if (Count == 2) color = 0xAAAAAA; else if (Count == 3) color = 0xffffff; try { if (SBC7835_CtrlLEDS((UInt32)color) != true) { if (Count == 0) { timer1.Stop(); return; } MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } else if(Count == 0) { LED_OFF_radioButton.Checked = true; timer1.Stop(); } else if (Count == 1) { LED_RED_radioButton.Checked = true; } else if (Count == 2) { LED_GREEN_radioButton.Checked = true; } else if (Count == 3) { LED_BLUE_radioButton.Checked = true; } } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED1_OFF_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED1,LED_OFF) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED1_RED_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED1, LED_RED) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED1_GREEN_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED1, LED_GREEN) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED1_BLUE_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED1, LED_BLUE) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED2_OFF_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED2, LED_OFF) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED2_RED_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED2, LED_RED) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED2_GREEN_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED2, LED_GREEN) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED2_BLUE_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED2, LED_BLUE) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED3_OFF_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED3, LED_OFF) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED3_RED_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED3, LED_RED) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED3_GREEN_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED3, LED_GREEN) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED3_BLUE_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED3, LED_BLUE) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED4_OFF_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED4, LED_OFF) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED4_RED_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED4, LED_RED) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED4_GREEN_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED4, LED_GREEN) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED4_BLUE_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED4, LED_BLUE) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED5_OFF_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED5, LED_OFF) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED5_RED_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED5, LED_RED) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED5_GREEN_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED5, LED_GREEN) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED5_BLUE_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED5, LED_BLUE) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED6_OFF_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED6, LED_OFF) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED6_RED_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED6, LED_RED) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED6_GREEN_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED6, LED_GREEN) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED6_BLUE_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED6, LED_BLUE) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED7_OFF_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED7, LED_OFF) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED7_RED_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED7, LED_RED) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED7_GREEN_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED7, LED_GREEN) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED7_BLUE_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED7, LED_BLUE) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED8_OFF_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED8, LED_OFF) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED8_RED_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED8, LED_RED) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED8_GREEN_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED8, LED_GREEN) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED8_BLUE_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED8, LED_BLUE) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED9_OFF_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED9, LED_OFF) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED9_RED_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED9, LED_RED) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED9_GREEN_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED9, LED_GREEN) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED9_BLUE_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED9, LED_BLUE) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED10_OFF_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED10, LED_OFF) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED10_RED_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED10, LED_RED) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED10_GREEN_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED10, LED_GREEN) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED10_BLUE_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED10, LED_BLUE) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED11_OFF_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED11, LED_OFF) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED11_RED_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED11, LED_RED) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED11_GREEN_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED11, LED_GREEN) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED11_BLUE_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED11, LED_BLUE) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED12_OFF_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED12, LED_OFF) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED12_RED_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED12, LED_RED) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED12_GREEN_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED12, LED_GREEN) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void LED12_BLUE_radioButton_CheckedChanged(object sender, EventArgs e) { try { if (SBC7835_CtrlOneLED(LED12, LED_BLUE) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void All_LED_Ctrl_button_Click(object sender, EventArgs e) { Int32 color = 0; /*将所有LED灯的状态存放到color变量中，每一个LED的状态占用2个bit,如 [bit1:bit0] * 表示LED1的状态，0表示熄灭，1表示红色，2表示绿色，3表示蓝色。其他 的LED通理*/ color |= (LED1_comboBox.SelectedIndex << (0 * 2)); color |= (LED2_comboBox.SelectedIndex << (1 * 2)); color |= (LED3_comboBox.SelectedIndex << (2 * 2)); color |= (LED4_comboBox.SelectedIndex << (3 * 2)); color |= (LED5_comboBox.SelectedIndex << (4 * 2)); color |= (LED6_comboBox.SelectedIndex << (5 * 2)); color |= (LED7_comboBox.SelectedIndex << (6 * 2)); color |= (LED8_comboBox.SelectedIndex << (7 * 2)); color |= (LED9_comboBox.SelectedIndex << (8 * 2)); color |= (LED10_comboBox.SelectedIndex << (9 * 2)); color |= (LED11_comboBox.SelectedIndex << (10 * 2)); color |= (LED12_comboBox.SelectedIndex << (11 * 2)); try { if (SBC7835_CtrlLEDS((UInt32)color) != true) MessageBox.Show("SBC7835 Send CMD Failed", "Warning"); } catch (Exception ex) { MessageBox.Show("SBC7835 Ctrl LEDS Error:" + ex.ToString(), "ERROR"); } } private void OpenCOM_button_Click(object sender, EventArgs e) { OpenCOM(); } } }
过程中遇到过一个问题，就是串口发送数据的时候总会失败，但是其他项目中也是通过这种方式去实现串口通讯的，代码上应该没有问题，所以
有点百思不得其解，直到我打开任务管理器，看到后台在运作的任务管理器中的串口助手，才知道串口被占用了。只要把串口助手关掉即可。
另外，C#上有一个简单的方法可以把设备上所有可用的串口列举出来的方法，代码如下：
using System.IO.Ports;
string[] PortName = SerialPort.GetPortNames(); for(int i = 0;i<PortName.Count();i++) { SerialPort_comboBox.Items.Add(PortName[i]); }
