Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Reading data from INI files
Generating random UUID values
Converting a decimal string to an integer
Retrieving list of available disk drives
Saying "Hello World!" with VFP and WinAPI
Using SQLBrowseConnect to connect to a data source through a number of iterative calls (SQL Server)
How to perform Base64 encoding/decoding using Cryptography API Functions
Using shared memory to exchange data between applications (processes)
Using the GetLogicalDriveStrings
Programmatically removing submenus from VFP main menu
Setting the Window Region for a form
GDI+: converting image file to another graphics format
How to start the screen saver and how to find whether the screen saver is active
A class that encrypts and decrypts files using Cryptography API Functions
How to drag a Form not using its Titlebar or Caption
Current directory of the application
Smart Card Database Query Functions
Reading and setting explicit Application User Model ID for the current process (Win7)
Using named pipes for interprocess communication
Converting long file names to the short format and vice versa
Hiding mouse cursor
Retrieving window and menu help context identifiers
GDI+: Color Transparency
Listing device drivers in the system: load addresses, names
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
Versions:
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.
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



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: 57  
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  
FreeTranslation.com offers instant, free translations of text or web pages.
User Contributed Notes:
There are no notes on this subject.


Copyright 2001-2015 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 (5.1.68), the Open Source standard SQL database, AceHTML Freeware Version 4, freeware HTML Editor of choice.   Hosted by Korax Online Inc.
Last Topics Visited (50.16.75.46)
17 sec.Function: 'LockWorkStation'
39 sec.Function: 'GetWindowLong'
1.75 min.Example: 'Creating a file, then moving it to another destination'
Google
Advertise here!