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Got "EntryPointNotFoundExcepti
Posted on 2013-11-07
Hi experts
My C# program called a function in an external DLL (written in C) but was given an "EntryPointNotFoundExcepti
In the C function, I'd got both the extern "C" and the "__declspec(dllimport)" as follows:
In my C# program, I had got:
Kindly please advise where I might have done incorrectly. Thanks in advance.
My C# program called a function in an external DLL (written in C) but was given an "EntryPointNotFoundExcepti
In the C function, I'd got both the extern "C" and the "__declspec(dllimport)" as follows:
extern "C" {
bool __stdcall __declspec(dllimport) test(int n, char * input);
}
In my C# program, I had got:
[DllImport("test.dll", CallingConvention=CallingConvention.Cdecl)]
public static extern bool test(int n, StringBuilder input);
Kindly please advise where I might have done incorrectly. Thanks in advance.
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4 Comments
I would suggest generating an interop assembly to access the dll with more managed code.
http://msdn.microsoft.com/
http://msdn.microsoft.com/
Remove '__stdcall' from the declaration, it causes the name to be appended with an ordinal when being exported. Also, you want to use '__declspec(dllexport)' there, because 'dllimport' does exactly the opposite. I.e.
extern "C" {
bool __declspec(dllexport) test(int n, char * input);
}
Active today
jkr is right. the dllimport must be used from other c or c++ dll's (executables) which want to use the function.
you may use macros in c/c++ header to support both export and import with one header:
for project testdll you would provide the macro TESTDLL_BUILD in the project settings or in makefile. for other c/c++ projects the above header can included and would switch the specifier to import.
for c# projects the macros (and the header) have no meaning.
Sara
you may use macros in c/c++ header to support both export and import with one header:
// header.h
#ifndef HEADER_H
#define HEADER_H
#ifdef __cplusplus
extern "C"
{
#endif
#ifdef TESTDLL_BUILD
#define TESTDLL_EXPORTIMPORT __declspec(dllexport)
#else
#define TESTDLL_EXPORTIMPORT __declspec(dllimport)
#endif
// ...
bool TESTDLL_EXPORTIMPORT test(int n, char * input);
// ...
#ifdef __cplusplus
}
#endif
#endif // HEADER_H
for project testdll you would provide the macro TESTDLL_BUILD in the project settings or in makefile. for other c/c++ projects the above header can included and would switch the specifier to import.
for c# projects the macros (and the header) have no meaning.
Sara
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