Java – get screenshot of StartMenu

I'm using BitBlt to capture a window If aviation theme is enabled, the background of the captured image is black If I disable DWM and capture the window, the captured image is very good

This is part of my code

HDC hdcMemDC = GDI32.INSTANCE.CreateCompatibleDC(desktopDC);
HDC windowDC = User32.INSTANCE.GetDC(window);

HWND window= User32Extra.INSTANCE.FindWindow(null,"Start menu");

GDI32Extra.INSTANCE.BitBlt(hdcMemDC,width,height,desktopDC,WinGDIExtra.SRCCOPY );
GDI32Extra.INSTANCE.BitBlt(hdcMemDC,windowBounds.left,windowBounds.top,windowWidth,windowHeight,windowDC,windowBounds.left+windowBounds1.right-windowBounds.right+(windowExtraGap/2),windowBounds.top+windowBounds1.bottom-windowBounds.bottom+(windowExtraGap/2),WinGDIExtra.SRCCOPY);

How do I capture the start menu with the appropriate background?

Is there any other way to obtain appropriate aerial window images?

Solution

Use desktop DC and cut to window

RECT rc,rc2;
GetClientRect(hWnd,&rc);
GetWindowRect(hWnd,&rc2);
int width = rc2.right - rc2.left;
int height = rc2.bottom - rc2.top;
HDC hdcScreen = GetDC(NULL); //!!!! Get desktop DC

HDC     hBmpFileDC = CreateCompatibleDC(hdcScreen);
HBITMAP hBmpFileBitmap = CreateCompatibleBitmap(hdcScreen,height);
HBITMAP hOldBitmap = (HBITMAP)SelectObject(hBmpFileDC,hBmpFileBitmap);
BitBlt(hBmpFileDC,hdcScreen,rc2.left,rc2.top,SRCCOPY | CAPTUREBLT);
HGdioBJ prev = SelectObject(hBmpFileDC,hOldBitmap);

SaveBitmap(szLogFilename,hBmpFileBitmap);

DeleteDC(hBmpFileDC);
DeleteObject(hBmpFileBitmap);

Another variant

RECT rc;
GetClientRect(hWnd,&rc);

int width = rc.right - rc.left;
int height = rc.bottom - rc.top;

HDC hdcScreen = GetDC(hWnd);
////////////////////////////
PrintWindow(hWnd,0);
PrintWindow(hWnd,PW_CLIENTONLY);
////////////////////////////    
HDC     hBmpFileDC = CreateCompatibleDC(hdcScreen);
HBITMAP hBmpFileBitmap = CreateCompatibleBitmap(hdcScreen,hBmpFileBitmap);

DeleteDC(hBmpFileDC);
DeleteObject(hBmpFileBitmap);

I call printwindow before calling any capture methods It is used to redraw its own window Therefore, the screenshot will have the correct picture I get the most stable result through the double call of printwindow