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EnumResourceTypes Function & C#

Posted on 2004-03-25
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Last Modified: 2012-06-27
Background: trying to grab some resources from a file. Take a look below, I need to know how to setup a callback function:

[DllImport("kernel32")]
private extern static long EnumResourceTypes(long hModule, long lpEnumFunc, long lParam);
[DllImport("kernel32")]
private extern static long EnumResTypeProc(long hModule, string lpszType, long lParam);

m_hMod = LoadLibraryEx(Filename, 0, LOAD_LIBRARY_AS_DATAFILE);
EnumResourceTypes(hModule, EnumResTypeProc(),0);

What do I need to do to get EnumResourceTypes to call the second variable as a callback function?
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Question by:rossryan
  • 3
3 Comments
 
LVL 48

Expert Comment

by:AlexFM
ID: 10684981
See
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dncscol/html/csharp09192002.asp
Functions with Callbacks

You don't need to import EnumResTypeProc. You should write it yourself and pass it's address to EnumResourceTypes.
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LVL 48

Expert Comment

by:AlexFM
ID: 10685011
Right EnumResourceTypes definition is:

[DllImport("kernel32")]
private extern static long EnumResourceTypes(IntPtr hModule, EnumResTypeProc callback, long lParam);

EnumResourceTypes is your delegate:

delegate bool EnumResourceTypes(
   IntPtr hModule,
   [MarshalAs(UnmanagedType.LPTStr)]
   string lpszType,
   long lParam);
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LVL 48

Accepted Solution

by:
AlexFM earned 2000 total points
ID: 10685036
Now write callback function according to delegate type:

bool EnumResourceTypesCallback(IntPtr hModule, string lpszType, long lParam)
{
    ...
}

And call EnumResourceTypes:

long result = EnumResourceTypes(hModule, new EnumResourceTypes(EnumResourceTypesCallback), lParam);
// (set hModule and lParam to required values).

Inplement required logic in EnumResourceTypesCallback function. Return 0 to stop enumeration, 1 to continue enumeration.
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