Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
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Setting the Window Region for a form
Using GetFileSize
Using the IsWindowEnabled function
Converting characters in a URL into corresponding escape sequences and backwards
GDI+: Storing DLL icon resources in image files
How to start the screen saver and how to find whether the screen saver is active
Minimizing all running applications
Obtaining I/O counts for the current process
Obtaining provider name for a specific type of network
PocketPC: creating directories and files
Printf-style formatted text output in VFP
Reading STARTUPINFO structure for the current VFP session
Testing if a connection to an Url can be established
Testing Transparent Menu Class with top-level form (requires VFP9)
Disabling drawing in the VFP form
Managing Cookies
Retrieving IP statistics for the computer
Using the FindMediaType function
Enhanced GetFont dialog
Enumerating forms supported by a specified printer
GDI+: loading image file, drawing on it, saving the result to another file

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Before you begin:
The example shows how to load an image file, put semi-transparent frame with a text on it, and save the result to another file.

Make sure the source and target file names are valid. The source file can be in any of graphics formats supported by the GDI+: BMP, GIF, JPG, TIF, EMF...

The code is based on custom GDI+ class. Download the class module first and save it in gdiplus.prg file.
SET PROCEDURE TO gdiplus ADDITIVE

PRIVATE gdiplus, src, dst, himage
gdiplus = CREATEOBJECT("gdiplusinit")

src = CREATEOBJECT("gdiimage", "c:\windows\forest.bmp")
dst = CREATEOBJECT("gdiimage", src)

IF dst.imgtype=0 OR VARTYPE(dst.graphics) <> "O"
    ? "Error code:", dst.errorcode
    RETURN
ENDIF

LOCAL gdibrush, gdipen, fnt
STORE 0 TO gdibrush, gdipen

* creating brush, pen and font objects
* note that the alpha channel is defined for the solid brush,
* which creates semi-transparent fill
= GdipCreateSolidFill(ARGB(255,255,255, 128), @gdibrush)
= GdipCreatePen1(ARGB(220,220,255), 2, 2, @gdipen)
fnt = CREATEOBJECT("gdifont", "Arial", 24, 1, ARGB(220,220,255))

* drawing filled semi-transparent rectangle with a border
= GdipFillRectangle(dst.graphics.graphics, gdibrush, 5,5, 160,50)
= GdipDrawRectangle(dst.graphics.graphics, gdipen, 5,5, 160,50)

* printing text
= dst.graphics.DrawText("SAMPLE",;
    fnt, 10,10, dst.imgwidth-10, 0)

* releasing system resources
= GdipDeletePen(gdipen)
= GdipDeleteBrush(gdibrush)

* creating drawing surface based on main VFP window
LOCAL gr
gr = CREATEOBJECT("graphics", _screen.HWnd)

gr.DrawImage(src, 20,20)
gr.DrawImage(dst, 20+src.imgwidth+5,20)

*= dst.SaveToFile("d:\temp\tmp.bmp")

* end of main



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1294 bytes  
Created: 2004-07-22 12:43:04  
Modified: 2005-10-13 10:33:55  
Visits in 7 days: 27  
Listed functions:
Printer friendly API declarations
My comment:
The transparency is controlled by the alpha-channel value. In this particular example a semi-transparent solid brush is used.

#kwd: sln_gdiplus.
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