在VS2010 用的QT框架做的海康sdk开发，预览不出图像。

qq_28818621 2016-03-22 01:37:25

直接贴代码
qt_test::qt_test(QWidget *parent, Qt::WFlags flags)
: QMainWindow(parent, flags)
{
ui.setupUi(this);

connect(ui.pushButton_3, SIGNAL(clicked()), this, SLOT(CamerStart())); //开始
connect(ui.pushButton, SIGNAL(clicked()), this, SLOT(CamerStop())); //停止
connect(ui.pushButton_4, SIGNAL(clicked()), this, SLOT(CamerExit())); //关闭

HWND hwnd = (HWND)ui.frame->winId();
//初始化
NET_DVR_Init();
//注册设备

NET_DVR_DEVICEINFO_V30 StruDeviceInfo;
IUserID = NET_DVR_Login_V30("192.168.1.64",8000,"admin","liginfo1001",&StruDeviceInfo);
if(IUserID < 0)
{
qDebug()<<"login error!\n";
NET_DVR_Cleanup();
return;
}
//启动预览

NET_DVR_PREVIEWINFO StruPlayInfo = {0};
StruPlayInfo.hPlayWnd = hwnd;
StruPlayInfo.lChannel = 1;
StruPlayInfo.dwStreamType = 1;
StruPlayInfo.dwLinkMode = 0;
StruPlayInfo.bBlocked = 0;
IRealPlayHandle = NET_DVR_RealPlay_V40(IUserID,&StruPlayInfo,NULL,NULL);
/*
NET_DVR_CLIENTINFO ClientInfo = {0};
ClientInfo.hPlayWnd = hwnd;
ClientInfo.lChannel = 1;
ClientInfo.lLinkMode = 0;
ClientInfo.sMultiCastIP = NULL;
IRealPlayHandle = NET_DVR_RealPlay_V30(IUserID,&ClientInfo,g_RealDataCallBack_V30,NULL,0);
*/
if(IRealPlayHandle<0)
{
qDebug()<<"play error!\n";
NET_DVR_Logout(IUserID);
NET_DVR_Cleanup();
return;
}
else
{

}
}

UI界面上画了三个按键用来控制的，一个frame 用来显示图像，我获取这个frame的句柄，然后调用NET_DVR_RealPlay_V30，播放，frame上市空的什么都没有。什么原因，新手，没搞过，我的平台是windows 跨平台用的QT做的

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