Error Returning Float from C dll

[beto]

A am receiving an error when attempting to return a float from a C function.

The following is the C code

#define DLL __declspec(dllexport)

DLL float testfloat()
{
return 3.3;
}

The following is the C# code

[DllImport(".\\testfloat.DLL")]
static extern float testfloat();

float temp = testfloat();

Any help is appreciated.

[Jon Skeet [C# MVP]]

beto <be*****@excite.com> wrote:

A am receiving an error when attempting to return a float from a C function.

What error are you receiving? I would also suggest that the interop
group might well give you useful answers, if no-one here knows.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Steve Waggoner]

> A am receiving an error when attempting to return a float from a C function.

The following is the C code

#define DLL __declspec(dllexport)

DLL float testfloat()
{
return 3.3;
}

The following is the C# code

[DllImport(".\\testfloat.DLL")]
static extern float testfloat();

try specifying the "__stdcall" calling convention for the C++ function
ex.

DLL float __stdcall testfloat()

[beto]

Jon Skeet [C# MVP] <sk***@pobox.com> wrote in message news:<MP************************@msnews.microsoft. com>...

beto <be*****@excite.com> wrote:

A am receiving an error when attempting to return a float from a C function.

What error are you receiving? I would also suggest that the interop
group might well give you useful answers, if no-one here knows.

A managed NotSupportedException occurred at Application::Fun+0xf

[beto]

"Steve Waggoner" <steve (nospam) waggoner@anysite (nospam) com> wrote in message news:<#o*************@TK2MSFTNGP10.phx.gbl>...

A am receiving an error when attempting to return a float from a C function.

The following is the C code

#define DLL __declspec(dllexport)

DLL float testfloat()
{
return 3.3;
}

The following is the C# code

[DllImport(".\\testfloat.DLL")]
static extern float testfloat();

try specifying the "__stdcall" calling convention for the C++ function
ex.

DLL float __stdcall testfloat()

Still received the same error message.

[beto]

The solution that ended up working was to return just an integer that
reported the final status of the dll. To return the float, a reference
was passed to the dll and then used by the C# application.

Example:
[DllImport(".\\testfloat.dll")]
static extern int testfloat([In, Out] float[] returnf);

float[] returnf = new float[] {0,0,0,0};
int status = testfloat(returnf);

be*****@excite.com (beto) wrote in message news:<7d**************************@posting.google. com>...

A am receiving an error when attempting to return a float from a C function.

The following is the C code

#define DLL __declspec(dllexport)

DLL float testfloat()
{
return 3.3;
}

The following is the C# code

[DllImport(".\\testfloat.DLL")]
static extern float testfloat();

float temp = testfloat();

Any help is appreciated.