我需要释放bitpointer,因为该函数已多次执行并且内存使用率由于某种原因我不了解,并且在达到ram使用率22mb之后崩溃。.如果我尝试删除bitpointerdelete []bitpointer这样的free(bitpointer)我收到访问冲突错误。但是我不明白为什么,因为该函数不再使用指针,并且设置了新的红色,蓝色,绿色值。

void Get_Color(int x,int y,int w,int h,int &red,int &green,int &blue,int action)
{
    HDC hdc, hdcTemp;
    RECT rect;
    BYTE*bitPointer=new BYTE[4*h*w];
    HWND Desktop = GetDesktopWindow();
    hdc = GetDC(Desktop);
    GetWindowRect(Desktop, &rect);
    hdcTemp = CreateCompatibleDC(hdc);
    BITMAPINFO bitmap;
    bitmap.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    bitmap.bmiHeader.biWidth = w;
    bitmap.bmiHeader.biHeight = h;
    bitmap.bmiHeader.biPlanes = 1;
    bitmap.bmiHeader.biBitCount = 32;
    bitmap.bmiHeader.biCompression = BI_RGB;
    bitmap.bmiHeader.biSizeImage = 0;
    bitmap.bmiHeader.biClrUsed = 0;
    bitmap.bmiHeader.biClrImportant = 0;
    HBITMAP hBitmap2 = CreateDIBSection(hdcTemp, &bitmap, DIB_RGB_COLORS, (void**)(&bitPointer), NULL, NULL);
    SelectObject(hdcTemp, hBitmap2);
    BitBlt(hdcTemp, 0, 0, w, h, hdc, x, y, SRCCOPY);
    if(action==1)
    {
        for(int j=0;j<=w*h*4;j+=4)
        {
            red = bitPointer[j+2];
            green = bitPointer[j+1];
            blue = bitPointer[j];
            if(red<30 && green>190 && blue>190)
            {
                break;
            }
        }
    }
    else
    {
        for(int j=0;j<=w*h*4;j+=4)
        {
            red = bitPointer[j+2];
            green = bitPointer[j+1];
            blue = bitPointer[j];
            break;

        }
    }
    ///RELEASE
    ReleaseDC(NULL,hdc);
    ReleaseDC(NULL,hdcTemp);
    delete []bitPointer; ///Error
}

最佳答案

在SelectObject中,保存返回的值:HGDIOBJ save = SelectObject(hdcTemp, hBitmap2);
然后在ReleaseDC之前,删除DIB DeleteObject( SelectObject(hdcTemp, save) );
否则,您将创建位图并且不要删除它们。

10-08 04:44