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Intel corner
Windows version
Asking for the correct Windows version from REALbasic Code using Declares.
Issue: 5.6 (September/October 2007)
Author: Christian Schmitz
Article Description: No description available.
Article Length (in bytes): 6,718
Starting Page Number: 44
RBD Number: 5617
Resource File(s):
5617.zip Updated: Friday, September 14, 2007 at 7:40 PM
Related Link(s): None
Known Limitations: None
Excerpt of article text...
All Windows versions should be equal to you as the programmer, but some are different so if a customer has a problem you might ask him what Operation System he is using. For Mac OS see the listing for a nice version function in Listing #1.
Collection version data for Windows
For Windows it's a little bit more complicated. First we will make a declare statement to the function GetVersionEx which returns the version information record. Than we have to interpret it, but let's start with the declare. The C code looks like that:
BOOL GetVersionExA(LPOSVERSIONINFO lpVersionInfo);
As you can see it's just a boolean function with a pointer (lp is short for a long pointer) pointing to a memoryblock. So we get this declare:
Declare function GetVersionExA lib "KERNEL32" (versioninfo as ptr) as boolean.
This function was extended around Windows 2000 so we try first to call the function with a 156 byte Memoryblock asking for the information. If we run on an old Windows version it will reject our request because of a mismatch in the memoryblock size, so we ask in this case again with a smaller block. We store in the first long inside the memoryblock the size of our block so Windows knows how much data it can savely place into the block.
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