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problems with dll library


Hi,

I have proble which I can not solve for a long time...

I use MinGW compiler to generate dll library - I use a following command to compile a code:

gcc -Wall -shared libraryX.c -o libraryX.dll

in the libraryX.c I put a simple function:

double signX( double x ) {
    double s = 0.0;
    
    /*Funtion body*/	
	if( x > 0.0) s = 1.0;
	if( x < 0.0) s = -1.0;
	
	return(s);
}

When I am trying to use this function in Mathematica with a command:

Needs["NETLink`"]
signX = DefineDLLFunction["signX", "libraryX.dll", "double", {"double"}];
signX[1.0]

I get a following error:

NET::netexcptn: 
"A .NET exception occurred: \!\(\"System.BadImageFormatException: Probowano zaladowac program w niepoprawnym formacie.
(Wyj\\:0105tek od HRESULT: 0x8007000B)\\n   w
Wolfram.NETLink.DynamicDLLNamespace.DLLWrapper16.signX(Double )


Does anybody know how to load such simple funtion in mathematica? 

I would be garteful for some hints.

Regards,

Piotr






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