1 reply to this topic

[coriscow]

Hi all!!

I am developing an app for a Pocket PC platform on C#. However, I need to make use of a C written dll. The problem arises when calling the function
.........

int capture_input( float32 ***cepstrum, int nrOfSeconds, int playBack, int *nrOfCoeff );

.........

where it returns an int (not an error code), a bidimensional array allocated within the function (cepstrum) and another integer (nrOfCoeff). I call the function from C# managed code using the following declaration and code:

.........

[DllImport ( "JanitorMobiledll.dll", EntryPoint = "capture_input" )]

private static extern int capture_input ( float[,] cepstrum, int nrOfSeconds,

int playback, ref int nrOfCepstra );

.........

int numberOfFrames = 0;

int numberOfCepstra = 0;

float[,] cepstrum;

.........

numberOfFrames = JHandShaker.capture_input ( cepstrum, maxNrOfSeconds, 1, ref numberOfCepstra );

.........

The problem arises in the unmanaged code when redirecting the received pointer to the allocated memory region

(*cepstrum=tmp_cep;).

What am I doing wrong??

Thanks!!!!

[BackSlash]

Ok, Well I don't do to much working with unmanaged code in C# but I think I will just throw this out and if it helps it helps and if I sound like a fool please disregard.

You are trying to set up a Managed link for unmanaged code and your problem is in the cepstrum array. Have you tried maybe using a jagged array instead of a rectanguar array, arr[][]

again, I have no real clue, but thought I might throw it out there.