m_hCapWnd:=capCreateCaptureWindow(Pchar('VideoTest'),
        WS_CHILD or WS_VISIBLE,0,0,AviPanel.width,AviPanel.height,AviPanel.Handle,0);if(capDriverConnect(m_hCapWnd,0)) then
      begin
         capPreviewRate(m_hCapWnd,30);
         capPreview(m_hCapWnd,true);   
         dwSize:=capGetVideoFormatSize(m_hCapWnd);
         capGetVideoFormat(m_hCapWnd,@setBmp, dwSize);
         setBmp.bmiHeader.biWidth:=352;           
         setBmp.bmiHeader.biHeight:=288; 
         capSetVideoFormat(m_hCapWnd,@setBmp,dwSize);
      end;不管我换到哪一路视频capDriverConnect(m_hCapWnd,0)始终为fasle哪位大侠帮我指点一下阿