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Save screenshot of DirectX window
Posted: Sat Apr 28, 2018 7:28 am
by Dude
I finally found some code that apparently saves DirectX screenshots. Anyone know how to convert it to PureBasic?
From:
https://www.gamedev.net/forums/topic/22 ... tx-window/
Code: Select all
Allright, i got it to work finally (working with GDI functions btw):
otherwindow = myClass.Getotherwindowhwnd();
myDC = GetDC (otherwindow);
memDC = CreateCompatibleDC (myDC);
myBitmap = CreateCompatibleBitmap (myDC, 800, 600);
SelectObject (memDC, myBitmap);
rc = BitBlt (memDC, 0, 0, 800, 600, myDC, 0, 0, SRCCOPY);
b = (char*) malloc (800*600*4);
for (int i=0;i < 256; i++) b = i;
BITMAPINFO* myInfo;
myInfo = (BITMAPINFO*) malloc (sizeof (BITMAPINFO) + sizeof(RGBQUAD)*800+600);
myInfo->bmiHeader.biBitCount = 32;
myInfo->bmiHeader.biClrImportant = 0;
myInfo->bmiHeader.biClrUsed = 0;
myInfo->bmiHeader.biCompression = BI_RGB;
myInfo->bmiHeader.biHeight = 600;
myInfo->bmiHeader.biPlanes = 1;
myInfo->bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
myInfo->bmiHeader.biSizeImage = 800*600*4;
myInfo->bmiHeader.biWidth = 800;
myInfo->bmiHeader.biXPelsPerMeter = 1;
myInfo->bmiHeader.biYPelsPerMeter = 1;
GetDIBits (memDC, myBitmap, 0, 600, b, myInfo, DIB_RGB_COLORS);
free (myInfo);
//free (b);
Now i have the screen shot in b[..] and can save it to disk. Thx for all replies anyway!!
Re: Save screenshot of DirectX window
Posted: Sat Apr 28, 2018 8:36 am
by chi
You can't use GDI to capture a fullscreen game! It will always just capture the empty window's client area where the game is rendered on, not the game itself...
On Vista or above, start a game in fullscreen and hold [Win] + hit [Tab]. Windows wont be able to show a preview of the game and I bet MS would, if they easily could
The only way I can think of is to hook the game (EndScene, glSwapBuffers, ...) and copy the content of the buffer to an image. Please correct me if I'm wrong...
Re: Save screenshot of DirectX window
Posted: Sat Apr 28, 2018 9:01 am
by firace
A quick, slimmed down conversion of the above code... (just replace TargetWindowTitle with the target you want to capture)
Does that work? (I didn't sleep much - There may be some bugs left)
Code: Select all
otherwindowID = FindWindow_(0,"TargetWindowTitle")
myDC = GetDC_(otherwindowID)
memDC = CreateCompatibleDC_(myDC)
myBitmap = CreateCompatibleBitmap_(myDC, 800, 600)
SelectObject_(memDC, myBitmap)
rc = BitBlt_(memDC, 0, 0, 800, 600, myDC, 0, 0, #SRCCOPY)
myInfo.BITMAPINFO
With myInfo\bmiHeader
\biSize=SizeOf(BITMAPINFOHEADER) ;Size of struct
\biWidth=800 ;Bitmap width
\biHeight=600 ;Bitmap height
\biPlanes=1 ;Single plane
\biBitCount=32 ;Bit depth
\biCompression=#BI_RGB ;No compression
\biSizeImage=800*600*4
\biXPelsPerMeter=0
\biYPelsPerMeter=0
\biClrUsed=0
\biClrImportant=0
EndWith
GetDIBits_(memDC, myBitmap, 0, 600, 0, myInfo, #DIB_RGB_COLORS);
OpenWindow(0, 100, 100, 440, 440, "")
ImageGadget(1,10,10,500,500,myBitmap)
Repeat : Until WaitWindowEvent() = 13116
Re: Save screenshot of DirectX window
Posted: Sat Apr 28, 2018 9:46 am
by Dude
chi wrote:start a game in fullscreen and hold [Win] + hit [Tab]. Windows wont be able to show a preview of the game
You're right.
The Windows thumbnail doesn't show the game. Thanks firace, for converting the code, too. It didn't work, unfortunately.