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覆巢之下焉有完卵。出来道上混,迟早是要还的。

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VFW视频采集怎么设置图像的大小？

2010-08-10 18:49:19| 分类： VFW | 标签： |举报 |字号大中小订阅

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我通过下面API设置没有用，请问怎么设置呢？
capGetVideoFormat(m_hVideoWnd,&bitinfo,sizeof(BITMAPINFO));
bitinfo.bmiHeader.biHeight=rc.Height();
bitinfo.bmiHeader.biWidth=rc.Width();
capSetVideoFormat(m_hVideoWnd,&bitinfo,sizeof(BITMAPINFO));
[left]1[/left]img src=[qu]1[/qu]http://daohang.quanqiugou88.com/t/4.png[qu]1[/qu]  alt=[qu]1[/qu][qu]1[/qu] /[right]1[/right]
图像的大小只有这么大，没有在整个对话框内，另外我希望在对话框最大化的时候，图像也随着对话框变大，请大家帮忙看下，谢谢

主要程序代码：
（1）对话框初始化函数中：
      GetWindowRect(&rc);
ScreenToClient(rc);

CAPDRIVERCAPS capd;
CAPSTATUS    caps;
BITMAPINFO bitinfo;

m_Event.ResetEvent();
   AfxBeginThread(ThreadFun,(void*)this); //开始一个线程

::WaitForSingleObject(m_Event,INFINITE); //等待线程函数的执行
if (capDriverConnect(m_hVideoWnd,0))    //连接驱动程序
{
capDriverGetCaps(m_hVideoWnd,sizeof(CAPDRIVERCAPS),&capd);
capGetStatus(m_hVideoWnd,&caps,sizeof(CAPSTATUS));

::SetParent(m_hVideoWnd,*this);    //设置父窗口
::SetWindowLong(m_hVideoWnd,GWL_STYLE,WS_CHILD);
::SetWindowPos(m_hVideoWnd,NULL,rc.left,rc.top,
rc.Width(),rc.Height(),SWP_NOZORDER);

::ShowWindow(m_hVideoWnd,SW_SHOW);
capGetVideoFormat(m_hVideoWnd,&bitinfo,sizeof(BITMAPINFO));
      bitinfo.bmiHeader.biHeight=rc.Height();
bitinfo.bmiHeader.biWidth=rc.Width();
      capSetVideoFormat(m_hVideoWnd,&bitinfo,sizeof(BITMAPINFO));
capPreviewRate(m_hVideoWnd,30); //设置预览速率
capPreview(m_hVideoWnd,true); //开始预览

}
else
{
AfxMessageBox([qu]1[/qu]创建失败[qu]1[/qu]);
}
（2）线程函数
UINT CCapVideoDlg::ThreadFun( LPVOID lpParam )
{
CCapVideoDlg* pTempDlg = (CCapVideoDlg*)lpParam;
if (pTempDlg!= NULL)
{
HWND hwnd= capCreateCaptureWindow(NULL,WS_POPUP,0,0,100,50,pTempDlg-[right]1[/right]m_hWnd,0);
pTempDlg-[right]1[/right]m_hVideoWnd = hwnd;
pTempDlg-[right]1[/right]m_Event.SetEvent();

MSG msg;
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
return 0;
}

=========================

HWND VFWAPI capCreateCaptureWindow(
LPCSTR lpszWindowName,
DWORD dwStyle,
int x,
int y,
int nWidth,
int nHeight,
HWND hWnd,
int nID
);
这个函数的第五，六个参数指定宽度和高度。

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