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我有简单的c + + DLL包含屏幕捕获代码。内存泄漏在c + + dll
HBITMAP hCaptureBitmap;
extern "C" __declspec(dllexport) HBITMAP __stdcall CaptureScreenByGDI(bool allScreens)
{
int nScreenWidth;
int nScreenHeight;
HDC hDesktopDC;
if(allScreens)
{
nScreenWidth = GetSystemMetrics(SM_CXVIRTUALSCREEN);
nScreenHeight = GetSystemMetrics(SM_CYVIRTUALSCREEN);
}
else
{
nScreenWidth = GetSystemMetrics(SM_CXSCREEN);
nScreenHeight = GetSystemMetrics(SM_CYSCREEN);
}
HWND hDesktopWnd = GetDesktopWindow();
if(allScreens)
{
hDesktopDC = GetDC(NULL);
}
else
{
hDesktopDC = GetDC(hDesktopWnd);
}
HDC hCaptureDC = CreateCompatibleDC(hDesktopDC);
hCaptureBitmap =CreateCompatibleBitmap(hDesktopDC,
nScreenWidth, nScreenHeight);
SelectObject(hCaptureDC,hCaptureBitmap);
BitBlt(hCaptureDC,0,0,nScreenWidth,nScreenHeight,
hDesktopDC,0,0,SRCCOPY|CAPTUREBLT);
ReleaseDC(hDesktopWnd,hDesktopDC);
DeleteDC(hCaptureDC);
return hCaptureBitmap;
}
extern "C" __declspec(dllexport) void __stdcall ClearAfterGDI()
{
DeleteObject(hCaptureBitmap);
}
从C#调用
CaptureScreenByGDI(true);
ClearAfterGDI();
后仍然存在内存泄漏。为什么? 如果我从CaptureScreenByGDI函数中调用DeleteObject(hCaptureBitmap)并返回void everthing是可以的。
如何解决这个问题?
应用程序验证程序可能会在某些情况下帮助。 –