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| GDI+: Storing content of the Clipboard to a bitmap file |
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| Before you begin: |
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The code is based on custom GDI+ class. Download the class module first and save it in gdiplus.prg file.
Related code samples:
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Storing screen shot of a form to a bitmap file
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SET PROCEDURE TO gdiplus ADDITIVE
#DEFINE CF_BITMAP 2
#DEFINE CF_DIB 8
DO decl
IF IsClipboardFormatAvailable(CF_DIB)=0
= MESSAGEBOX("No image data found stored " +;
"on the clipboard. ")
RETURN
ENDIF
* an instance of gdiplusinit should be created before
* and released after using any of gdi+ objects
PRIVATE gdiplus As gdiplusinit, img As gdibitmap
gdiplus = CREATEOBJECT("gdiplusinit")
= OpenClipboard(0)
LOCAL bmp As gdibitmap, hBitmap, hDib, lResult
hBitmap = GetClipboardData(CF_BITMAP)
hDib = GetClipboardData(CF_DIB)
bmp = CREATEOBJECT("gdibitmap")
* use either of two ways to create an instance
* of the gdibitmap object
*lResult = bmp.CreateFromHBITMAP(hBitmap)
lResult = bmp.CreateFromBITMAPINFO(hDib)
IF lResult
* make sure the target folder is valid
* uncomment one or more lines with savetofile
*!* bmp.savetofile("c:\temp\tmp.jpg")
*!* bmp.savetofile("c:\temp\tmp.gif")
*!* bmp.savetofile("c:\temp\tmp.bmp")
*!* bmp.savetofile("c:\temp\tmp.tif")
*!* bmp.savetofile("c:\temp\tmp.png")
ENDIF
= CloseClipboard()
* end of main
PROCEDURE decl
DECLARE INTEGER CloseClipboard IN user32
DECLARE INTEGER OpenClipboard IN user32 INTEGER hwnd
DECLARE INTEGER GetClipboardData IN user32 INTEGER uFormat
DECLARE INTEGER IsClipboardFormatAvailable IN user32;
INTEGER wFormat
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User rating: 0/10 (0 votes) | | | 1358 bytes
Created: 2004-12-05 15:02:35
Modified: 2004-12-05 16:06:00
Visits in 7 days: 191 |
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| My comment: |
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When an image is copied, most likely it creates on the clipboard at least three different blocks of data:
- Bitmap handle (CF_BITMAP)
- BITMAPINFO structure (CF_DIB)
- BITMAPV5HEADER structure (CF_DIBV5)
This code above retrieves data in CF_DIB format from the clipboard and passes it to the GdipCreateBitmapFromGdiDib function to create an instance of GDI+ bitmap object. This newly created object can be saved to a file, printed or painted on a window.
The GetClipboardData returns a pointer to a memory object containing a BITMAPINFO structure followed by the bitmap bits.
There is a simplification in the way the code treats the BITMAPINFO data. For some display resolutions, like 1, 4, 8 and rarely 16 bits per pixel, the BITMAPINFO structure may contain a color table. If you are able to use GDI+ and Visual FoxPro, most likely your display resolution does not require a presence of such color table in the BITMAPINFO structure. That is how this structure is believed to contain only 40 bytes occupied by BITMAPINFOHEADER data.
* * *
Same way the GetClipboardData call with CF_BITMAP as input parameter can retrieve a bitmap handle. This handle then can be passed to the GdipCreateBitmapFromHBITMAP function to create an instance of GDI+ bitmap object. This newly created object can be saved to a file, printed or painted on a window. |
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