我看过这个网站和其他网站的类似问题的多个回复，虽然我觉得我已经接近了，但我还是做不到。不过，这可能是一个超级愚蠢的问题。
所以我过去每隔几分钟只调用一次WndProc案例“WM_Paint”（通过InvalidateRect），所以我没有真正注意到泄漏。现在我添加了一些东西，每秒调用它约5次。在那一秒，我的内存使用量跃升约3800k。是的，这引起了注意...... 这是代码：
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
// Other cases omitted since we skip them due to "case WM_Paint:".
case WM_PAINT:
wndProc_Paint(hwnd);
break;
// Other cases omitted since we skip them due to "break;".
}
return 0;
}
void wndProc_Paint(HWND hwnd)
{
g_hbmBoard = ConvertIplImageToHBITMAP(targetBoardImg); //OpenCV command
BITMAP bm;
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps); // <- Breakpoint here while monitoring mem usage shows this is what is adding ~772k per call which never gets released.
HDC hdcMem = CreateCompatibleDC(hdc);
HBITMAP hbmOld = (HBITMAP)SelectObject(hdcMem, g_hbmBoard);
GetObject(g_hbmBoard, sizeof(bm), &bm);
BitBlt(hdc, 0, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
hbmOld = (HBITMAP)SelectObject(hdcMem, g_hbmGreenLight);
GetObject(g_hbmGreenLight, sizeof(bm), &bm);
BitBlt(hdc, screenResW - 59, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
hbmOld = (HBITMAP)SelectObject(hdcMem, g_hbmWorkingLight);
GetObject(g_hbmWorkingLight, sizeof(bm), &bm);
BitBlt(hdc, screenResW - 94, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
hbmOld = (HBITMAP)SelectObject(hdcMem, g_hbmWorkingIndicator);
GetObject(g_hbmWorkingIndicator, sizeof(bm), &bm);
BitBlt(hdc, screenResW - 129, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
//DeleteObject(hbmOld);
SelectObject(hdcMem, hbmOld);
DeleteDC(hdcMem);
//SelectObject(hdc, hbmOld);
//ReleaseDC(hwnd, hdc);
//DeleteDC(hdc);
//DeleteObject(hdc);
EndPaint(hwnd, &ps);
}
除了g_hbmWorkingIndicator段和注释掉的部分之外，这是我的WM_Paint在被调用5次/秒之前的样子（甚至在我把它放入它自己的函数之前 - 这是一个单独的问题）。
“HDC hdc = BeginPaint（hwnd，＆amp; ps）;”是添加内存的地方，它永远不会被释放。每次我们完成这个功能都会发生这种情况。所以我现在尝试解决这个问题。
阅读类似的问题，我认为我需要释放或删除hdc的DC。我不是（仍然不是 - 是的，我已经阅读过MSDN页面）确定SelectObject如何使用这些，所以我尝试使用和不使用ReleaseDC＆amp;删除hdc和hdcMem的DC（＆amp; both）。我也尝试过DeleteObject for hdc＆amp; hdcMem。这些都没有任何影响。
DeleteObject（hbmOld）有效果。 解决了这个问题。除了这是错误的解决方案，因为虽然我没有失控的内存，但我确实有一些视觉效果被错误的视觉效果所取代。 g_hbmGreenLight通常获取g_hbmBoard的图形，而g_hbmWorkingLight变为绿色（g_hbmGreenLight的图形）。移动“DeleteObject（hbmOld）;”在EndPaint（〜）之后或尝试使用“SelectObject”只是改变哪些对象被哪个错误的图形替换 - 也;返回内存泄漏。
编辑：为了完整起见，我在这里包含了ConvertIplImageToHBITMAP（IplImage * image）的代码。这完全有可能是罪魁祸首。
HBITMAP ConvertIplImageToHBITMAP(IplImage* pImage)
{
IplImage* image = (IplImage*)pImage;
bool imgConverted = false;
if(pImage->nChannels != 3)
{
IplImage* imageCh3 = cvCreateImage(cvGetSize(pImage), 8, 3);
if(pImage->nChannels==1){cvCvtColor(pImage, imageCh3, CV_GRAY2RGB);}
image = imageCh3;
imgConverted = true;
}
int bpp = image->nChannels * 8;
assert(image->width >= 0 && image->height >= 0 && (bpp == 8 || bpp == 24 || bpp == 32));
CvMat dst;
void* dst_ptr = 0;
HBITMAP hbmp = NULL;
unsigned char buffer[sizeof(BITMAPINFO) + 255*sizeof(RGBQUAD)];
BITMAPINFO* bmi = (BITMAPINFO*)buffer;
BITMAPINFOHEADER* bmih = &(bmi->bmiHeader);
ZeroMemory(bmih, sizeof(BITMAPINFOHEADER));
bmih->biSize = sizeof(BITMAPINFOHEADER);
bmih->biWidth = image->width;
bmih->biHeight = image->origin ? abs(image->height) : -abs(image->height);
bmih->biPlanes = 1;
bmih->biBitCount = bpp;
bmih->biCompression = BI_RGB;
if (bpp == 8)
{
RGBQUAD* palette = bmi->bmiColors;
int i;
for (i = 0; i < 256; i++)
{
palette[i].rgbRed = palette[i].rgbGreen = palette[i].rgbBlue = (BYTE)i;
palette[i].rgbReserved = 0;
}
}
hbmp = CreateDIBSection(NULL, bmi, DIB_RGB_COLORS, &dst_ptr, 0, 0);
cvInitMatHeader(&dst, image->height, image->width, CV_8UC3, dst_ptr, (image->width * image->nChannels + 3) & -4);
cvConvertImage(image, &dst, image->origin ? CV_CVTIMG_FLIP : 0);
if(imgConverted)
{cvReleaseImage(&image);}
return hbmp;
}
所以，所有这一切：帮我StackExchange，你是我唯一的希望！ ; _;
答案 0 :(得分：9)
您正在丢失HBITMAP返回的原始SelectObject(hdcMem, g_hbmBoard)，因此在调用DeleteDC()之前您没有正确恢复它，因此它会被泄露。每次拨打hbmOld时，您都会覆盖SelectObject()变量，但在重写hbmOld之前，您不会将当前dcMem值恢复为hbmOld。使用SelectObject()时，必须在完成对HDC的更改后恢复原始对象。
请改为尝试：
void wndProc_Paint(HWND hwnd)
{
g_hbmBoard = ConvertIplImageToHBITMAP(targetBoardImg); //OpenCV command
BITMAP bm;
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
HDC hdcMem = CreateCompatibleDC(hdc);
HBITMAP hbmOld = (HBITMAP) SelectObject(hdcMem, g_hbmBoard); // save the original HBITMAP
GetObject(g_hbmBoard, sizeof(bm), &bm);
BitBlt(hdc, 0, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
SelectObject(hdcMem, g_hbmGreenLight); // returns g_hbmBoard, no need to save it to hbmpOld
GetObject(g_hbmGreenLight, sizeof(bm), &bm);
BitBlt(hdc, screenResW - 59, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
SelectObject(hdcMem, g_hbmWorkingLight); // returns g_hbmGreenLight, no need to save it to hbmpOld
GetObject(g_hbmWorkingLight, sizeof(bm), &bm);
BitBlt(hdc, screenResW - 94, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
SelectObject(hdcMem, g_hbmWorkingIndicator); // returns g_hbmWorkingLight, no need to save it to hbmpOld
GetObject(g_hbmWorkingIndicator, sizeof(bm), &bm);
BitBlt(hdc, screenResW - 129, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
SelectObject(hdcMem, hbmOld); // restore the original HBITMAP
DeleteDC(hdcMem);
EndPaint(hwnd, &ps);
// who owns g_hbmBoard? ConvertIplImageToHBITMAP() creates
// a new HBITMAP, so you need to free it with DeleteObject()
// before calling ConvertIplImageToHBITMAP() again. It would
// be better to create g_hbmBoard one time outside of WM_PAINT,
// recreate g_hbmBoard only when the source image actually changes,
// and then re-use g_hbmBoard as-is inside of WM_PAINT.
// ConvertIplImageToHBITMAP() really does not belong in WM_PAINT...
//
//DeleteObject(g_hbmBoard);
}
或者，请改用SaveDC() / RestoreDC()：
void wndProc_Paint(HWND hwnd)
{
g_hbmBoard = ConvertIplImageToHBITMAP(targetBoardImg); //OpenCV command
BITMAP bm;
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hwnd, &ps);
HDC hdcMem = CreateCompatibleDC(hdc);
int iOldState = SaveDC(hdcMem); // save everything the HDC currently has selected
SelectObject(hdcMem, g_hbmBoard);
GetObject(g_hbmBoard, sizeof(bm), &bm);
BitBlt(hdc, 0, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
SelectObject(hdcMem, g_hbmGreenLight);
GetObject(g_hbmGreenLight, sizeof(bm), &bm);
BitBlt(hdc, screenResW - 59, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
SelectObject(hdcMem, g_hbmWorkingLight);
GetObject(g_hbmWorkingLight, sizeof(bm), &bm);
BitBlt(hdc, screenResW - 94, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
SelectObject(hdcMem, g_hbmWorkingIndicator);
GetObject(g_hbmWorkingIndicator, sizeof(bm), &bm);
BitBlt(hdc, screenResW - 129, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
RestoreDC(hdcMem, iOldState); // restore everything the HDC originally had selected
DeleteDC(hdcMem);
EndPaint(hwnd, &ps);
// who owns g_hbmBoard? ConvertIplImageToHBITMAP() creates
// a new HBITMAP, so you need to free it with DeleteObject()
// before calling ConvertIplImageToHBITMAP() again. It would
// be better to create g_hbmBoard one time outside of WM_PAINT,
// recreate g_hbmBoard only when the source image actually changes,
// and then re-use g_hbmBoard as-is inside of WM_PAINT...
// ConvertIplImageToHBITMAP() really does not belong in WM_PAINT...
//
//DeleteObject(g_hbmBoard);
}