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window下c++共享内存，进程互斥锁。

news 2025/7/25 15:24:42

全局文件

#ifndef DEFINE_H
#define DEFINE_H#include<QString>
#include <windows.h>
#include <iostream>
#include <string>typedef struct
{short dataType;short width;short height;}MessageData;const wchar_t *share_memory_name=L"shareMemory0";
const wchar_t *hMutex=L"DateIsReady";const int share_memory_size=1024*10;#endif // DEFINE_H

进程1

#include "mainwindow.h"#include <QApplication>
#include "Define.h"#include <windows.h>
#include <iostream>
#include <QDebug>int main(int argc, char *argv[])
{QApplication a(argc, argv);MainWindow w;w.show();HANDLE hMapFile=CreateFileMapping(INVALID_HANDLE_VALUE,NULL,PAGE_READWRITE,0,share_memory_size,share_memory_name);if(hMapFile==nullptr){qDebug()<<QObject::tr("开辟内存失败");return -1;}LPVOID pBuf=MapViewOfFile(hMapFile,FILE_MAP_ALL_ACCESS,0,0,share_memory_size);if(pBuf==nullptr){qDebug()<<QObject::tr("映射内存失败");CloseHandle(hMapFile);return -1;}HANDLE  hmutex=CreateMutex(NULL,false,hMutex);if(hmutex==nullptr){qDebug()<<QString("lock create fail");return -1;}else{qDebug()<<QString("lock create succ");}while(1){DWORD ts=WaitForSingleObject(hmutex,INFINITE);if(ts==WAIT_OBJECT_0){MessageData data0;data0.dataType=1;data0. width=200;data0. height=230;//  ZeroMemory(pBuf,share_memory_size);memcpy(pBuf,&data0,sizeof(MessageData));Sleep(1000);ReleaseMutex(hmutex);}}return a.exec();
}

进程2

#include "mainwindow.h"#include <QApplication>#include "Define.h"#include<QString>
#include <windows.h>
#include <iostream>
#include <string>
#include <QDebug>int main(int argc, char *argv[])
{QApplication a(argc, argv);MainWindow w;w.show();HANDLE hMapFile1=CreateFileMapping(INVALID_HANDLE_VALUE,NULL,PAGE_READWRITE,0,share_memory_size,share_memory_name);if(hMapFile1==nullptr){qDebug()<<QObject::tr("开辟内存失败");return -1;}LPVOID pBuf1=MapViewOfFile(hMapFile1,FILE_MAP_ALL_ACCESS,0,0,share_memory_size);if(pBuf1==nullptr){qDebug()<<QObject::tr("映射内存失败");CloseHandle(hMapFile1);return -1;}while(1){HANDLE hmutex1=OpenMutex(SYNCHRONIZE,false,hMutex);//HANDLE hmutex1=CreateMutex(NULL,false,hMutex);if(hmutex1==nullptr){qDebug()<<QObject::tr("锁失败")<<123;} else{qDebug()<<QObject::tr("锁成功")<<456;DWORD ts1=WaitForSingleObject(hmutex1,INFINITE);if(ts1==WAIT_OBJECT_0){//4.读取数据MessageData data0;memcpy(&data0,pBuf1,sizeof(MessageData));qDebug()<<"内容"<<data0.width;ReleaseMutex(hmutex1);}}}return a.exec();
}