PROBLEMAS AO CAPTURAR WEBCAM NO WINDOWS 7

var
HwebCam: HWND;

function capCreateCaptureWindowA(lpszWindowName: pchar; dwStyle: dword; x, y, nWidth, nHeight: word; ParentWin: dword; nId: word): dword; stdcall external 'avicap32.dll';

implementation

Function CapturarWebCam(DestinoCapBMP:string) : Boolean;
const
WM_WEBCAM = $400;
WM_CONECTAR_DRIVER_WEBCAM = WM_WEBCAM + $a;
WM_DESCONECTAR_DRIVER_WEBCAM = WM_WEBCAM + $b;
WM_GUARDAR_CAPTURA = WM_WEBCAM + 25;
WM_FECHAR_WEBCAM = $0010;
begin
if HwebCam = 0 then
begin //WS_CHILD //WS_VISIBLE
HwebCam := capCreateCaptureWindowA('CaptureWindow', $40000000 and $10000000, 0, 0, 0, 0, GetDesktopWindow, 0);
if SendMessage(HwebCam, WM_CONECTAR_DRIVER_WEBCAM, 0, 0) <> 1 then
begin
HwebCam := 0;
Result := False;
end else begin
SendMessage(HwebCam, WM_GUARDAR_CAPTURA, wparam(0), lparam(PChar(DestinoCapBMP)));
SendMessage(HwebCam, WM_FECHAR_WEBCAM, 0, 0);
SendMessage(HwebCam, WM_FECHAR_WEBCAM, 0, 0);
HwebCam := 0;
Result := True;
end;
end else
Result := False;
end;

Procedure Capturar;
Const
Captura = 'C:\Users\Gil\Desktop\WebCam Captura.bmp';
begin
if not CapturarWebCam(Captura) then
MessageBox(0,Pchar('Não foi possivél capturar a webcam'#10''),'Erro',16);
end;