Printscreen in Windows

[Acrobat]

Does anybody have a solution to make screenshots in Windows in Fullescreen ? First of all you can't handle printscreen button (via sfml), second, by default you got black screen. So i think we need to handle it, and upload our picture ?

[eXpl0it3r]

If you just want the content of the window: window.capture()

[Acrobat]

If you just want the content of the window: window.capture()

Your answers are SOOO "helpfull".

Solution to make a printscreen if fullscreen mode on windows :

void copyScreenshotToClipboard(const sf::Image & image)
{
        BITMAPINFOHEADER bmpInfoHeader = {0};
        bmpInfoHeader.biSize = sizeof(BITMAPINFOHEADER);
        bmpInfoHeader.biBitCount = 24;
        bmpInfoHeader.biClrImportant = 0;
        bmpInfoHeader.biClrUsed = 0;
        bmpInfoHeader.biCompression = BI_RGB;
        bmpInfoHeader.biHeight = image.getSize().y;
        bmpInfoHeader.biWidth = image.getSize().x;
        bmpInfoHeader.biPlanes = 1;
        bmpInfoHeader.biSizeImage = image.getSize().x * image.getSize().y * 3;

        HGLOBAL hResult;
        if (!OpenClipboard(NULL)) return ;
        if (!EmptyClipboard()) return ;
       
        int size = sizeof(BITMAPINFOHEADER) + bmpInfoHeader.biSizeImage;
        hResult = GlobalAlloc(GMEM_MOVEABLE, size);
        if (hResult == NULL) return ;

        void * pointer = GlobalLock(hResult);
        memcpy(pointer, &bmpInfoHeader, sizeof(BITMAPINFOHEADER));
        pointer = (void*) ((int)pointer + sizeof(BITMAPINFOHEADER));
        const unsigned char * src = image.getPixelsPtr() + (image.getSize().y - 1) * image.getSize().x * 4;
        unsigned char * dest = (unsigned char*)pointer;
        unsigned int srcIndex = 0;
        unsigned int dstIndex = 0;
        for (unsigned int i = 0; i < image.getSize().y; i++) {
                for (unsigned int j = 0; j < image.getSize().x; j++) {                 
                        dest[dstIndex + 0] = src[srcIndex + 2];
                        dest[dstIndex + 1] = src[srcIndex + 1];
                        dest[dstIndex + 2] = src[srcIndex + 0];
                        dstIndex += 3;
                        srcIndex += 4;
                }
                srcIndex = 0;
                src -= image.getSize().x * 4;
                if (image.getSize().x % 4 != 0) dstIndex += 4 - image.getSize().x % 4;
        }

        GlobalUnlock(hResult);

        if (SetClipboardData(CF_DIB, hResult) == NULL) {
                CloseClipboard();
                return ;        // error
        }

        CloseClipboard();
        GlobalFree(hResult);
}
 

This will copy the content of image to clipbuffer, you can insert it to any other program (photoshop, paint, etc.)

To Handle print screen use :

GetAsyncKeyState(VK_SNAPSHOT)

call copyScreenshotToClipboard on the next iteration

[eXpl0it3r]

Your answers are SOOO "helpfull".

Sorry, from your vague description it's impossible to know what you actually want to achieve.

Besides the window.capture() function works quite well to get the content of the window and since you're in full screen mode your window size equals the screen size and thus a 'print screen' is the same as capturing the content of the window.

Besides that you've never mentioned that you want the image in the clipboard...

[LD_FLO]

Thanks Acrobat, very useful

Why SFML doesn't have such a feature ? It could be nice to be able to send input too.

[Hapax]

Why SFML doesn't have such a feature ?

Capturing the window (fullscreen or not) is possible with SFML.
Sending to the clipboard is not, yet.