Windows 10版本1703(15063.138)上的bitblt失败 [英] bitblt failed on Windows 10 version 1703 (15063.138)
问题描述
使用Visual Studio 2017,vc141,以下代码应从游戏前窗口获取屏幕截图,但现在它返回黑白图像.
using Visual Studio 2017, vc141, the following code should got a screenshot from front game window but now it return a black and blank image.
游戏的唯一问题(尝试过OpenGL和Vulkan,ogl返回黑色,vulkan返回白色)
only issue with games(tried OpenGL and Vulkan, ogl return black, vulkan return white)
在升级到Windows 10 1703之前,它可以在Windows 10 1607和Windows 7 sp1上工作
before upgrade to windows 10 1703, it works on windows 10 1607 and windows 7 sp1
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
代码:
BOOL ScreenShot(cv::Mat *img, HWND hWnd = NULL) {
HBITMAP hBitmap;
HDC hdcSys = GetDC(hWnd);
HDC hdcMem = CreateCompatibleDC(hdcSys);
void *ptrBitmapPixels;
BITMAPINFO bi;
HDC hdc;
RECT rect;
if (!GetWindowRect(hWnd, &rect) || (hWnd == NULL)) {
return FALSE;
}
ZeroMemory(&bi, sizeof(BITMAPINFO));
LONG lWidth = rect.right - rect.left;
LONG lHeight = rect.bottom - rect.top;
bi.bmiHeader.biSize = sizeof(BITMAPINFO);
bi.bmiHeader.biWidth = lWidth;
bi.bmiHeader.biHeight = -lHeight;
bi.bmiHeader.biPlanes = 1;
bi.bmiHeader.biBitCount = 32;
hdc = GetDC(hWnd);
hBitmap = CreateDIBSection(hdc, &bi, DIB_RGB_COLORS, &ptrBitmapPixels, NULL, 0);
SelectObject(hdcMem, hBitmap);
*img = cv::Mat(lHeight, lWidth, CV_8UC4, ptrBitmapPixels, 0);
BitBlt(hdcMem, 0, 0, lWidth, lHeight, hdcSys, 0, 0, SRCCOPY);
//DeleteObject(hBitmap);
DeleteDC(hdcMem);
ReleaseDC(hWnd, hdcSys);
ReleaseDC(hWnd, hdc);
return TRUE;
}
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
/*...*/
HotKeyId = GlobalAddAtom(L"DBKGNDSCREENSHOT");
RegisterHotKey(hWnd, HotKeyId, NULL, VK_F10);
/*...*/
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
/*...*/
case WM_HOTKEY:
if (wParam == HotKeyId) {
cv::Mat t;
HWND MainHWND;
MainHWND = GetForegroundWindow();
ScreenShot(&t, MainHWND);
cv::imshow("1", t);
}
break;
/*...*/
}
甚至是黑色的PrintWindow(至少我们有一个标题栏)
and still black even PrintWindow(at least we got a titlebar)
PrintWindow(hWnd, hdcMem, 0);
//BitBlt(hdcMem, 0, 0, lWidth, lHeight, hdcSys, 0, 0, SRCCOPY);
我将此程序发送给了我的朋友(不做任何修改,他的OS = win7 x64),但是他得到了正确的结果.
I send this program to my friend (without any modify, his OS=win7 x64), but he got the correct result.
那我该怎么办?
推荐答案
GDI是一项非常古老的技术,并且已逐渐被弃用.在Windows 10上捕获桌面的更可靠方法是通过桌面复制API .
GDI is a very old technology and is slowly getting deprecated. The more reliable method to capture desktop on Windows 10 would be through Desktop Duplication API.
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