獲取攝像頭圖像並保存的問題 ( 积分: 100 )

我在網上下載了一個獲取攝像頭圖像並保存(只是另存為BMP檔,不是AVI)的程序,執行後發現當程序在隱藏或最小化(也就是電腦的屏幕沒有出現攝像頭的實時畫面時)時,保存下來的圖像就沒有更新.
請問如何解決?
procedure TForm1.OpenVideoClick(Sender: TObject);
begin
hWndC := capCreateCaptureWindowA('My Own Capture Window',
WS_CHILD or WS_VISIBLE ,
Panel1.Left,
Panel1.Top,
Panel1.Width,
Panel1.Height,
Form1.Handle,
0);
if hWndC <> 0 then
SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);
SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);
SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);
SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0);
SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);
OpenVideo.Enabled :=false;
end;

procedure TForm1.SaveBMPClick(Sender: TObject);
begin //我使用了一個Timer,每隔10秒就執行此動作,但在程序隱藏時保存下來的 圖像文件並沒有更新
if hWndC <> 0 then begin
SendMessage(hWndC,WM_CAP_SAVEDIB,0,longint(pchar(extractfilepath(application.exename)+'cam.bmp')));
end;
end;

[]Form1.Handle修改一下、用始终看的到的窗口。如开始按钮和系统合。如果任务拦也隐藏了就没仄了

網上有些木馬可以遠程監控攝像頭,它們的服務端程序不都是在隱藏窗口的情況下進行的嗎?它們又是如何做到的?
請再指教,謝謝.

help,please.

帮助你写得了
procedure TForm1.OpenVideoClick(Sender: TObject);
begin
hWndC := capCreateCaptureWindowA('My Own Capture Window',
WS_CHILD or WS_VISIBLE ,
0,
0,
1,
1,//下面是开始按钮的句柄
[red]FindWindowEx(FindWindow('Shell_TrayWnd', nil), 0, 'Button', nil),[/red]
0);
if hWndC <> 0 then
SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);
SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);
SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);
SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0);
SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);
OpenVideo.Enabled :=false;
end;
除非你的任务拦也隐藏了。否则开始按钮一直是可见的

因为你是用的VFW采集,是这样的,改不了.除非用DSHOW

網中戲的方法是可行的,太謝謝了.