display image on desktop

This code has been declared by its author to be Public Domain code.

display image on desktop by b32

2007

I'm not sure if the loaded bitmap needs to be cleaned up after usage. I've tested this code on my pc and I was able to draw the image all over the desktop. It doesn't remove it, however, I can imagine you can copy a portion of the desktop before drawing onto it, and place it back afterwards. The program was based on several programs I found on the net.

In combination with the hack to hide your startup window, this can be used for splash screens.
http://www.blitzbasic.com/Community/posts.php?topic=37093

;--------------------------------------------------------------------------------
;								draw image on desktop
;--------------------------------------------------------------------------------


	Const bmpname$ = "earth.bmp"

	;load image	   	
	image = api_LoadImage(0, bmpname$, 0, 0, 0, $10)
	
	;get desktop dc
	hdc = api_GetDC(0)

	;create new dc and place image on it
	hdc2 = api_CreateCompatibleDC(hdc)
	api_SelectObject(hdc2, image)
			
	;copy data
	api_BitBlt(hdc, 0, 0, 256, 256, hdc2, 0, 0, $CC0020)
	
	;clean up dcs
	api_ReleaseDC(DeskHwnd, hdc)
	api_DeleteDC(hdc2)
	
	WaitKey()
	End


;--------------------------------------------------------------------------------
;save these lines as a .decls file in the \program files\blitz\userlibs directory
;--------------------------------------------------------------------------------
		
;	.lib "user32.dll"
;	
;	api_LoadImage% (hInst%, lpsz$, un1%, n1%, n2%, un2%) : "LoadImageA"
;	api_ReleaseDC%(hWnd%,hDC%) : "ReleaseDC"
;	api_GetDC%(hWnd%) : "GetDC"
;	
;	
;	.lib "gdi32.dll"
;	
;	api_BitBlt%(hDestDC%,X%,Y%,nWidth%,nHeight%,hSrcDC,XSrc,YSrc,dwRop) : "BitBlt"
;	api_CreateCompatibleDC% (hdc%) : "CreateCompatibleDC"
;	api_SelectObject% (hdc%, hObject%) : "SelectObject"
;	api_DeleteDC% (hdc%) : "DeleteDC"

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