Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
GDI+: custom control, base class
Pocket PC: enumerating mounted database volumes and databases in the Object Store
StrDup returns a pointer to the duplicate of a source VFP string
Extracting the name and extension parts of a path string
Retrieving list of all active RAS connections
Retrieving list of Global Atom names
Retrieving statistics for the TCP protocol running on the local computer
Setting the Window Region for a form
Using the IsWindowEnabled function
Dial the Net Automatically
GDI+: cropping images
How to release and renew a lease on an IP address previously obtained through Dynamic Host Configuration Protocol (DHCP)
Retrieving information about all users currently logged on to the workstation (WinNT only)
Retrieving IP statistics for the computer
Using InternetGoOnline function
Using Multimedia Command Strings to play MIDI files
Reading keys in the specified section of the Win.ini file
Retrieving information about MS-DOS device names using QueryDosDevice (WinNT only)
Retrieving names for the registered clipboard formats
Using the SetErrorMode for determining if a floppy drive is ready
CryptoAPI: retrieving list of providers
Obtaining provider name for a specific type of network
Retrieving Network Provider information
Closing Windows
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: 85  
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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