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VB Forum / Win API / January 2008Constants for API functions
Where is the best place to get the constant values for some of the API functions? For instance, using the GPO API I have some constants like GPO_LIST_FLAG_MACHINE which I know is &H1 because I had to Google it. How else would I get the &H1 value? It is not included in the MSDN documentation. Thanks!! > Where is the best place to get the constant values for some of the API > functions? [quoted text clipped - 3 lines] > else would I get the &H1 value? It is not included in the MSDN > documentation. Your absolute best source of these constants are C++ header files (these are files with a .h extension). The MSDN documentation will tell you (usually) which header file. Just for an example, in searching the Oct 2001 MSDN Library, I found GPO_LIST_FLAG_MACHINE in the topic for the GetGPOList function. The docs mention the header being Userenv.h. Looking in that file, I found this: #define GPO_LIST_FLAG_MACHINE 0x00000001 // Return machine policy information #define GPO_LIST_FLAG_SITEONLY 0x00000002 // Return site policy information only #define GPO_LIST_FLAG_NO_WMIFILTERS 0x00000004 // Ignore WMI filters when filtering GPO's #define GPO_LIST_FLAG_NO_SECURITYFILTERS 0x00000008 // Ignore security filters Obviously, you need to convert this to VB syntax, so it helps to know at least a little about C++. Also, you should install the latest Platform SDK. This will ensure you have the latest .h files. Search Microsoft Downloads for various Platform SDKs: http://www.microsoft.com/downloads/Search.aspx Here's the link for the SDK to Windows Server 2008: http://www.microsoft.com/downloads/details.aspx?FamilyID=3671e40c-d700-4509-9ed0 -30e00ea38a9c&DisplayLang=en Here's the link to the SDK for Vista: http://www.microsoft.com/downloads/details.aspx?FamilyID=c2b1e300-f358-4523-b479 -f53d234cdccf&DisplayLang=en And here's the link to the SDK for Windows Server 2003 SP1: http://www.microsoft.com/downloads/details.aspx?FamilyId=A55B6B43-E24F-4EA3-A93E -40C0EC4F68E5&displaylang=en  SignatureMike Microsoft MVP Visual Basic > Where is the best place to get the constant values for some of the API > functions? [quoted text clipped - 3 lines] > else would I get the &H1 value? It is not included in the MSDN > documentation. Where you find these things is variable depending on where that particular manufacturer publishes them. As MikeD said for MS they are usually published in SDKs which can be downloaded from Microsoft. For other manufacturers they could be published in any way. Michael Thank you for the replies, I am new to using the APIs and I appreciate the point in the right direction. > Where is the best place to get the constant values for some of the API > functions? [quoted text clipped - 5 lines] > > Thanks!! > Where is the best place to get the constant values for some of the API > functions? [quoted text clipped - 5 lines] > > Thanks!! Many times I've found constant values by way of Google using a quoted phrase. "const GPO_LIST_FLAG_MACHINE =" That one only shows 4 hits, but the first 3 you could copy and paste right from the results. >> Where is the best place to get the constant values for some of the API >> functions? [quoted text clipped - 13 lines] > That one only shows 4 hits, but the first 3 you could copy and paste right > from the results. But that's relying on someone having asked for that particular const declaration and gotten the declaration posted in a reply. It's certainly possible one needs a constant that's never been asked about. If you have the .h files, it's probably easier to just find it in them. Nothing difficult about converting C++ constants to VB. SignatureMike Microsoft MVP Visual Basic >> Many times I've found constant values by way of Google using a quoted >> phrase. [quoted text clipped - 6 lines] > But that's relying on someone having asked for that particular const > declaration and gotten the declaration posted in a reply. Or finding sample code posted, like at Randy's site. > It's certainly possible one needs a constant that's never been asked about. Definitely. > If you have the > .h files, it's probably easier to just find it in them. Nothing difficult > about converting C++ constants to VB. Yeah, I have TextPad setup to scan through them all, for me, when I need 'em. Definitely best, but it can be frustrating at times. In particular when you get things with multiple indirections in the damned definitions... <grumble> Signature.NET: It's About Trust! http://vfred.mvps.org Hello, If you use the APIs in Visual Basic, this is an address to look at : http://allapi.mentalis.org/ The main page says goodbye, but dated 2002 ... They used to propose a download for an api viewer, here is one that seems to stay updated -less documented with examples than the previous one, but with the formats for more various languages : http://www.activevb.de/rubriken/apiviewer/index-apiviewer.html The site is german but it seems an English speaker can find one's way. If you speak French, here is a very nice place to find info about APIs -although I am less sure about the constants : http://docvb.free.fr/api.php _____________________________________________ Brian Mitchell a écrit, le 10/12/2007 02:53 : > Where is the best place to get the constant values for some of the API > functions? [quoted text clipped - 5 lines] > > Thanks!! |
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