Printwindow prints with empty space - winapi

Question

The width and height of application Melon is 438 x 615 pixels and ::GetWindowRect() function grab it correctly.
However, ::PrintWindow() function draws smaller size which is 348 x 489 pixels, rest of them filled with black blank(may be draw nothing)
...may the one picture will be better than hundreds of discription.
here is result of the code
bool result = true;
HWND appHWnd = ::FindWindow(nullptr, TEXT("Melon"));
RECT appWindowRect; ::GetWindowRect(appHWnd, &appWindowRect);
HDC appDC = ::GetWindowDC(appHWnd);
// HDC appDC = ::GetDC(appHWnd); // same issue occured either
// HDC appDC = ::GetDC(nullptr);
HDC memoryDC = ::CreateCompatibleDC(appDC);
HBITMAP capturedScreenBitmap = ::CreateCompatibleBitmap(
appDC,
appWindowRect.right - appWindowRect.left,
appWindowRect.bottom - appWindowRect.top
);
HBITMAP memoryBitmap = static_cast<HBITMAP>(::SelectObject(memoryDC, capturedScreenBitmap));
result = ::PrintWindow(appHWnd, memoryDC, 0);
//copy to clipboard
OpenClipboard(nullptr);
EmptyClipboard();
SetClipboardData(CF_BITMAP, capturedScreenBitmap);
CloseClipboard();
::SelectObject(memoryDC, memoryBitmap);
::DeleteObject(capturedScreenBitmap);
::DeleteDC(memoryDC);
::ReleaseDC(appHWnd, appDC);
Strangely, C# version of the code works correctly. import same user32 library, use same of it and output different result? why?

Answer 1

It will be down to DPI awareness – David Heffernan
::GetWindowRect, which used to c# project and C++ console project in Visual Studio, aren't affected from the scaling by dpi awareness. but, what used to qt studio are affected from it.
here is my solution.
RECT appWindowRect; {
::GetWindowRect(hwnd, &appWindowRect);
}
POINT appWindowSize; {
qreal dotsPerInch = QApplication::screens().at(0)->logicalDotsPerInch();
appWindowSize.x = static_cast<LONG>((appWindowRect.right - appWindowRect.left) * 96 / dotsPerInch);
appWindowSize.y = static_cast<LONG>((appWindowRect.bottom - appWindowRect.top) * 96 / dotsPerInch);
}