thomas

利用Event和MapFile进程共享信息

工作过程:


进程一, 建立映射文件,填写数据,并发出Event的信号;


进程二,打开映射文件,收到Event的信号时读取数据.

#include <windows.h>
#include 
<string.h>
#include 
<iostream>
using namespace std;

#define FILE_SIZE 1024

static HANDLE hMapFile;
static LPVOID lpMapAddress;
static LPCTSTR g_szEventName="EventName";

void Write(char* data){
    
if(lpMapAddress!=NULL){
        memset(lpMapAddress,
0,FILE_SIZE);
        sprintf((
char*)lpMapAddress,"%s",data);
    }

}


void Read(){
    
if(lpMapAddress!=NULL){
        printf(
"%s\n",lpMapAddress);
    }

}



void Process1(){//写数据
hMapFile = CreateFileMapping(
    INVALID_HANDLE_VALUE,               
// Current file handle. 
    NULL,                              // Default security. 
    PAGE_READWRITE,                    // Read/write permission. 
    0,                                 // Max. object size. 
    FILE_SIZE,                         // Size of hFile. 
    "MyFileMappingObject");            // Name of mapping object. 
 
if (hMapFile == NULL) 

    printf(
"Could not create file-mapping object."); 
    
return ;
}
 

//
lpMapAddress = MapViewOfFile(hMapFile, // Handle to mapping object. 
    FILE_MAP_ALL_ACCESS,               // Read/write permission 
    0,                                 // Max. object size. 
    0,                                 // Size of hFile. 
    FILE_SIZE);                                // Map entire file. 
 
if (lpMapAddress == NULL) 

    printf(
"Could not map view of file."); 
    
return ;
}
 
::Sleep(
10000);
//Write data
HANDLE hEvent=::OpenEvent(
        EVENT_MODIFY_STATE,
        FALSE,
        g_szEventName);

while(hEvent!=NULL){
        scanf(
"%s",lpMapAddress);
        ::SetEvent(hEvent);
}

::CloseHandle(hEvent);
hEvent
=INVALID_HANDLE_VALUE;

}


void Process2(){//读数据
hMapFile = OpenFileMapping(FILE_MAP_ALL_ACCESS, // Read/write permission. 
    FALSE,                             // Do not inherit the name
    "MyFileMappingObject");            // of the mapping object. 
 
if (hMapFile == NULL) 

    printf(
"Could not open file-mapping object.\n"); 
    
return;
}
 
 
lpMapAddress 
= MapViewOfFile(hMapFile, // Handle to mapping object. 
    FILE_MAP_ALL_ACCESS,               // Read/write permission. 
    0,                                 // Max. object size. 
    0,                                    // Size of hFile. 
    FILE_SIZE);                                // Map entire file. 
 
if (lpMapAddress == NULL) 

    printf(
"Could not map view of file.\n"); 
    
return;
}
 

//Wait for data
HANDLE hEvent=::CreateEvent(
        NULL,
        TRUE,
        FALSE,
        g_szEventName);

while(hEvent!=NULL){
        ::WaitForSingleObject(hEvent,INFINITE);
        ::ResetEvent(hEvent);
        ::Read();
    }

::CloseHandle(hEvent);
hEvent
=INVALID_HANDLE_VALUE;
}


void main(){
    
int flag;
    cin
>>flag;
    
if(flag==1){
        Process1();
    }

    
else if(flag==2){
        Process2();
    }

}

posted on 2005-04-03 15:51  THOMAS  阅读(1432)  评论(0编辑  收藏  举报

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