using dllimport

Question

I'm trying to use the DllImport attribute in the following code:

[DllImport("grfinger.dll",EntryPoint="_grstartenroll@4")]
public static extern int startenroll(int context);

to get the function name I used dumpbin /export. When I run the code I get the following exception:

Unable to find an entry point name '_grstartenroll@4' in DLL 'grfinger.dll'.

How can I resolve this error?

score 5 · Answer 1 · edited Oct 12 '09 at 13:15

5

_grstartenroll@4 is the decorated function name in the dll.

That looks like standard calling convention naming, you could try:

[DllImport("grfinger.dll",EntryPoint="_grstartenroll@4", CallingConvention=CallingConvention.StdCall]
public static extern int startenroll(int context);

Otherwise I would try and get the undecorated function name, you can pipe the output of dumpbin to undname like this:

dumpbin /exports grfinger.dll | undname _grstartenroll@4

and then use the undecorated function name in your dll import.

edited Oct 12 '09 at 13:15

vgru

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answered Oct 12 '09 at 13:13

ParmesanCodice

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1

+1, Besides dumpbin, you can also check this free tool: "Dependency Walker" (a.k.a. "depends") http://www.dependencywalker.com/. – vgru Oct 12 '09 at 13:14
Dependency Walker is a good alternative, and such a small download – ParmesanCodice Oct 12 '09 at 17:39

score 0 · Answer 2 · answered Oct 12 '09 at 13:00

0

Without knowning anything about the specific function or library: I believe specifying the entrypoint as entrypoint="startenroll" or entrypoint="#4" instead of the dumpbin output might help.

answered Oct 12 '09 at 13:00

Johan Kullbom

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using dllimport

2 Answers2