Freeing Memory allocted in unmanged C code

[skg]

I am passing the address of pointer like char** from managed extension and
getting the
its initialized value from a C library dll.

How can i free the memory from the code in Managed Extension ?

Here is a sample C function i am calling from managed extension.

C dll Code
==============

extern "C" void __declspec(dlle xport) Test(char **p)
{

int nSize = 10000;

*p= (char*)::malloc (nSize);

while(--nSize)

*(*p+nSize)='A' ;

}

// Iam currently calling back to C dll to free the memory it allocated.

extern "C" void __declspec(dlle xport) TestFree(char **p)

{

::free(*p);

}

Managed Extension Code Function.
=============== =====
StringBuilder *strB;

char *pszString;

Test(&pszString );

strB->Append(pszStri ng);

//Marshal::FreeCo TaskMem((IntPtr )pszString); //This throws exception.after
certain number of iterations of calling this function

TestFree(&pszSt ring); // I am currently calling this since above statement
does not work.

How can i free the memory in Managed Extension ?
Thanks!!!!

[Willy Denoyette [MVP]]

Memory allocated using malloc() must be freed by calling free() as you did.
Memory allocated using CoTaskMemAlloc must be freed using FreeCoTaskMem.
Willy.
"skg" <sk*@yahoo.co m> wrote in message
news:eP******** ******@tk2msftn gp13.phx.gbl...

I am passing the address of pointer like char** from managed extension and
getting the
its initialized value from a C library dll.

How can i free the memory from the code in Managed Extension ?

Here is a sample C function i am calling from managed extension.

C dll Code
==============

extern "C" void __declspec(dlle xport) Test(char **p)
{

int nSize = 10000;

*p= (char*)::malloc (nSize);

while(--nSize)

*(*p+nSize)='A' ;

}

// Iam currently calling back to C dll to free the memory it allocated.

extern "C" void __declspec(dlle xport) TestFree(char **p)

{

::free(*p);

}

Managed Extension Code Function.
=============== =====
StringBuilder *strB;

char *pszString;

Test(&pszString );

strB->Append(pszStri ng);

//Marshal::FreeCo TaskMem((IntPtr )pszString); //This throws
exception.after certain number of iterations of calling this function

TestFree(&pszSt ring); // I am currently calling this since above statement
does not work.

How can i free the memory in Managed Extension ?
Thanks!!!!