screen to bitmap API

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3 total messages Started by poojo hackma Thu, 26 Oct 2006 14:14

#2975

Author: poojo hackma
Date: Thu, 26 Oct 2006 14:14

4 lines
1118 bytes

I'm looking for an API call that can capture the display of whatever Window 
I have selected, and turn that into a bitmap.

Is such an API out there?

Re: screen to bitmap API

#2976

Author: Remy Lebeau (TeamB)
Date: Thu, 26 Oct 2006 16:37

12 lines
1155 bytes

"poojo hackma" <poojo.com/mail> wrote in message
news:4540c2b4@newsgroups.borland.com...

> I'm looking for an API call that can capture the display of
> whatever Window I have selected, and turn that into a bitmap.

Simply retreive the HDC for the window and then BitBlt() it into your
bitmap's HDC.


Gambit

Re: screen to bitmap API

#2979

Author: JF Jolin
Date: Thu, 26 Oct 2006 16:55

59 lines
2451 bytes

> Remy Lebeau (TeamB) <no.spam@no.spam.com> wrote:
> news:4540e4bb$1@newsgroups.borland.com...
>
>> Simply retreive the HDC for the window and then BitBlt() it into your
>> bitmap's HDC.
>

Example "Capturing an image" taken from help file.


/*
  * Create a normal DC and a memory DC for the entire screen. The
  * normal DC provides a "snapshot" of the screen contents. The
  * memory DC keeps a copy of this "snapshot" in the associated
  * bitmap.
  */

hdcScreen = CreateDC("DISPLAY", NULL, NULL, NULL);
hdcCompatible = CreateCompatibleDC(hdcScreen);

/* Create a compatible bitmap for hdcScreen. */

hbmScreen = CreateCompatibleBitmap(hdcScreen,
                      GetDeviceCaps(hdcScreen, HORZRES),
                      GetDeviceCaps(hdcScreen, VERTRES));

if (hbmScreen == 0)
     errhandler("hbmScreen", hwnd);

/* Select the bitmaps into the compatible DC. */

if (!SelectObject(hdcCompatible, hbmScreen))
     errhandler("Compatible Bitmap Selection", hwnd);

         /* Hide the application window. */

         ShowWindow(hwnd, SW_HIDE);

         /*
          * Copy color data for the entire display into a
          * bitmap that is selected into a compatible DC.
          */

         if (!BitBlt(hdcCompatible,
                0,0,
                bmp.bmWidth, bmp.bmHeight,
                hdcScreen,
                0,0,
                SRCCOPY))

         errhandler("Screen to Compat Blt Failed", hwnd);

         /* Redraw the application window. */

         ShowWindow(hwnd, SW_SHOW);


__
JF Jolin

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