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QT 5.11进程之间通讯方式

谷中百合517 2022-02-15 阅读 42

一: 通过消息进行传递

QT是通过nativeEvent()函数来捕获window系统发送过来的消息,所以要重写这个消息。

而MFC是通过重写OnCopyData来捕获消息

在发送和接收方都添加 

#pragma execution_character_set("utf-8")

头文件添加:

#include <qt_windows.h>
#pragma comment(lib, "user32.lib")

发送方:

HWND hWnd = NULL;
    QString  str("服务端");
    hWnd = ::FindWindowW(NULL, (LPCWSTR)str.utf16());//找窗口名称,窗口名称中文英文均可
    int a = 0;
    if(::IsWindow(hWnd))
    {
        COPYDATASTRUCT cd;

        QString str = QStringLiteral("new data1245");
        cd.dwData = 100;
        cd.cbData = str.length();
        cd.lpData = str.toUtf8().data();
        ::SendMessageW(hWnd, WM_COPYDATA, 0,reinterpret_cast<LPARAM>(&cd));
        
    }

接收方


bool Widget::nativeEvent(const QByteArray &eventType, void *message, long *result)
{

    MSG *param = static_cast<MSG *>(message);

       switch (param->message)
       {
       case WM_COPYDATA:
       {
           COPYDATASTRUCT *cds = reinterpret_cast<COPYDATASTRUCT*>(param->lParam);
          //QString *cds = reinterpret_cast<QString*>(param->lParam);



           if (cds->dwData == 100)
           {
               char buf[100]={0};
               memcpy(buf, cds->lpData, cds->cbData);
               //QString strMessage =buf;
               QString strMessage = QString::fromUtf8(reinterpret_cast<char*>(cds->lpData), cds->cbData);
               QString strMessage2 =  (char *)(cds->lpData);

               qDebug() <<  "len=" <<strMessage.length()<< strMessage2.length()<< endl;
               QString str1 = QString::fromUtf8("提示");
               qDebug() << "message1=" <<(strMessage)<<endl;

               qDebug() << "message17=" <<strMessage.toUtf8()<<endl;
               QMessageBox::warning(this, str1, strMessage);

               qDebug() << "message3=" <<strMessage.toLatin1()<<endl;
               *result = 1;
               return true;
           }
       }
       }

       return QWidget::nativeEvent(eventType, message, result);
}

问题: 关键是:两个客户端都设置了

#pragma execution_character_set("utf-8")

但在接收显示时,中文一直乱码。。。。各位大神求支招。。。

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