Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Converting a hexadecimal string to an integer
Enumerating MIDI output devices
Enumerating Volumes and Volume Mounting Points (NTFS)
Retrieving graphic capabilities of your display
How to test file attributes (key method for FileExists and DirectoryExists routines)
Retrieving System Error message strings
Using shared memory to exchange data between applications (processes)
Retrieving country-specific dialing information from the Windows Telephony list of countries
Retrieving national language settings
Smart Card Database Query Functions
Retrieving list of available disk drives
Winsock: initializing the service in the VFP application
An alternative way of setting Form.Closable to False
How to drag a Form not using its Titlebar or Caption
Retrieving configuration information for the specified server (Win98/Me)
GDI+: Storing DLL icon resources in image files
Using Shell for performing operations on files
Using the GetLogicalDriveStrings
Converting path to original case
How to perform Base64 encoding/decoding using Cryptography API Functions
Using named pipes for interprocess communication
Converting a decimal string to an integer
Using custom Simple MapiSendMail class
Generating random UUID values
GDI+: loading image file, drawing on it, saving the result to another file

User rating: 0/10 (0 votes)
Rate this code sample:
  • ~
More code examples    Listed functions    Add comment     W32 Constants      Translate this page Printer friendly version of this code sample
click to open
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.

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( <> "O"
    ? "Error code:", dst.errorcode

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(, gdibrush, 5,5, 160,50)
= GdipDrawRectangle(, gdipen, 5,5, 160,50)

* printing text
    fnt, 10,10, dst.imgwidth-10, 0)

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

* creating drawing surface based on main VFP window
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

User rating: 0/10 (0 votes)
Rate this code sample:
  • ~
1294 bytes  
Created: 2004-07-22 12:43:04  
Modified: 2005-10-13 10:33:55  
Visits in 7 days: 15  
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.
Word Index links for this example:
Translate this page:
  Spanish    Portuguese    German    French    Italian offers instant, free translations of text or web pages.
User Contributed Notes:
There are no notes on this subject.

Copyright 2001-2016 News2News, Inc. Before reproducing or distributing any data from this site please ask for an approval from its owner. Unless otherwise specified, this page is for your personal and non-commercial use. The information on this page is presented AS IS, meaning that you may use it at your own risk. Microsoft Visual FoxPro and Windows are trade marks of Microsoft Corp. All other trademarks are the property of their respective owners. 

Privacy policy
Credits: PHP (4.4.9), an HTML-embedded scripting language, MySQL (5.6.30), the Open Source standard SQL database, AceHTML Freeware Version 4, freeware HTML Editor of choice.   Hosted by Korax Online Inc.
Last Topics Visited (
45 sec.Function: 'Escape'
3.62 min.Example: 'How to retrieve adapter information for the local computer (including MAC address)'
Advertise here!