window下c++共享内存，进程互斥锁。

全局文件

c 复制代码

#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

cpp 复制代码

#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

cpp 复制代码

#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();
}