 |
| GDI+: Storing content of the Clipboard to a bitmap file |
User rating: 0/10 (0 votes) | | |
|
|
|
Versions:
click to open |
|
|
|
|
| Before you begin: |
|
The code is based on custom GDI+ class. Download the class module first and save it in gdiplus.prg file.
Related code samples:
Storing content of the Clipboard to a bitmap file using GDI API
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
Copying picture of the active form to the Clipboard using Bitmap API functions
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
Storing screen shot of a form to a bitmap file
|
|
|
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
|
|
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: 198 |
|
|
|
| Listed functions: |
|
|
|
|
| My comment: |
|
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. |
|
|
| Word Index links for this example: |
|
|
|
|
|
| Translate this page: |
|
|
Moving shortcut to a specified position on the Windows Desktop 
