WIN32 DLL动态链接库

WIN32 DLL创建动态链接库.

步骤如下:

<1> : 先开发一个DLL动态链接库:程序如下:

 

#include<afx.h>

 

 

_declspec(dllexport) void _stdcall WriteToWinfile(LPCTSTR appname,LPCTSTR keyname,LPCTSTR str){

 

       WriteProfileString(appname,keyname,str);

 

}

 

 

_declspec(dllexport) void _stdcall ReadFromWinFile(LPCTSTR appname,LPCTSTR keyname,LPCTSTR def,char* retstr,DWORD nsize){

      

       GetProfileString(appname,keyname,def,retstr,100);

       MessageBox(NULL,retstr,"read info",MB_OK);

}

/*

_declspec(dllexport) void _stdcall WriteRegPara(LPCTSTR lpValueName,DWORD dwType,DWORD value,DWORD cbData){

 

              HKEY m_Hkey;

              RegCreatePara(HKEY_CURRENT_USER,"Software\\www.google.com\\admin",&m_Hkey);

              RegSetValueEx(m_Hkey,lpValueName,0,REG_DWORD,(CONST BYTE *)value,cbData);

              RegClosePara(m_Hkey);

}

 

_declspec(dllexport) void _stdcall ReadRegPara(LPTSTR lpValueName,LPBYTE lpData,LPDWORD lpcbData){

              HKEY m_Hkey;

              DWORD dwType;

              RegCreatePara(HKEY_CURRENT_USER,"Software\\www.google.com\\admin",&m_Hkey);

              RegQueryValueEx(m_Hkey,lpValueName,0,&dwType,lpData,lpcbData);

}

*/

def文件如下编写:

LIBRARY

EXPORTS

WriteToWinfile @1

ReadFromWinFile @2

<2> : 编译上面的文件,生成一个dll文件,将这个文件复制到新建的工程中,在新建的工程中,调用动态链接库:程序如下:

#include<iostream>

#include<windows.h>

using namespace std;

void main(){

 

       char retstr[100];

       HINSTANCE hInst;

       hInst=LoadLibrary("dll5.dll");

       typedef void (_stdcall *ADDPROC)(LPCTSTR appname,LPCTSTR keyname,LPCTSTR str);

       ADDPROC WriteToWin=(ADDPROC)GetProcAddress(hInst,"WriteToWinfile");

       if(!WriteToWin){

              return;

       }

       WriteToWin("warden","nickname","www.google.com");

/*---

       char ip[16];

       DWORD num=0;

       num=GetProfileString("warden","nickname","def",ip,16);

       cout<<num<<endl<<ip<<endl;

---*/

/*----     

       GetProfileString("warden","nickname","liis",retstr,100);

       MessageBox(NULL,retstr,"read info",MB_OK);

----*/

       typedef void (_stdcall *ADDPROCD)(LPCTSTR appname,LPCTSTR keyname,LPCTSTR def,LPCTSTR retstr,DWORD nsize);

       ADDPROCD ReadFromWin=(ADDPROCD)GetProcAddress(hInst,"ReadFromWinFile");

       if(!ReadFromWin){

              return;

       }

 

       ReadFromWin("warden","nickname","lisi",retstr,100);

       MessageBox(NULL,retstr,"read info",MB_OK);

 

       FreeLibrary(hInst);

}

三种颜色标出了三种调用方式,读取值后,再利用MessageBox函数弹出一个对话框!

 

一个重要的说明:

windows中的LPTSTR 类型对应上char ch[]类型!

OK!

运行上面的结果,一切正常了!