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jin005
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../DSPack/Demos/D6-D7/PlayVideoCap的Demo实现了捕获一个视频设备的图像并在Image中回放，我在那个程序中又加了一个FilterGraph1,Filter1,Image1还有SampleGrabber1和VideoWindow1，并使用SysDev创建了两个设备（一个是摄像头，一个是采集卡），运行后两个VideoWindow和两个Image都能正常回显视频，但是在运行几分钟以后会出现错误提示：
检测到错误类EInvalidPointer,错误信息:'Invalid pointer operation'.进程终止.或者程序自动退出，使用单步或运行继续运行,
我在SampleGrabber1的过程中是这样写的
SampleGrabber的过程也是一样但是Image)
procedure TVideoForm.SampleGrabber1Buffer(sender: TObject;
SampleTime: Double; pBuffer: Pointer; BufferLen: Integer);
begin
if CallBack.Checked then
begin
try
Image1.Canvas.Lock;
try
SampleGrabber1.GetBitmap(Image1.Picture.Bitmap);
except
exit;
end;
finally
Image1.Canvas.Unlock;
end;
end;
end;
检测到错误类EInvalidPointer,错误信息:'Invalid pointer operation'.进程终止.或者程序自动退出，使用单步或运行继续运行,
我在SampleGrabber1的过程中是这样写的
SampleGrabber的过程也是一样但是Image)procedure TVideoForm.SampleGrabber1Buffer(sender: TObject;
SampleTime: Double; pBuffer: Pointer; BufferLen: Integer);
begin
if CallBack.Checked then
begin
try
Image1.Canvas.Lock;
try
SampleGrabber1.GetBitmap(Image1.Picture.Bitmap);
except
exit;
end;
finally
Image1.Canvas.Unlock;
end;
end;
end;