I have to pass a byte array as an input parameter to a function in a
propertary dll.
The c++ signature of the original function is the following:

---------- C++ ----------

        int ncWrite(unsigned long ObjHandle, unsigned long DataSize, void*
DataPtr)

---------- end C++ ----------

---------- C# ----------

        [DllImport("Nican.dll")]
        unsafe static extern int ncWrite(uint ObjHandle, uint DataSize,
IntPtr DataPtr);

---------- end C# ----------

And I use it as:

---------- C# ----------

        byte[] DataWrite = {0x23, 0x23, 0x30, 0x03, 0x78, 0xEC, 0xFF, 0xFF };
        int myStatus;

        IntPtr ptr = Marshal.AllocHGlobal(8);
        Marshal.Copy(DataWrite, 0, ptr, 8);
        myStatus = ncWrite(WriteAddress, 8 , ptr);
        Marshal.FreeHGlobal(ptr);

---------- end C# ----------

This works, but having to handle unmanaged code I''m worried by memory
leaks (this function is called thousdands of times per minute).
Is it the usage correct? Have I choosen the right Marshal methods
(Marshal.AllocHGlobal, Marshal.Copy, Marshal.FreeHGlobal)?

Thank you very much

"Beorne" <matteo@gmail.com> schrieb im Newsbeitrag
news:1180512385.176140.32650@u30g2000hsc.googlegroups.com...

This seems to be OK. You should add a try/finally to get sure the memory
gets cleared in case of an exception.

IntPtr ptr = Marshal.AllocHGlobal(8);
try
{
    Marshal.Copy(DataWrite, 0, ptr, 8);
    myStatus = ncWrite(WriteAddress, 8, ptr);

finally
{
    Marshal.FreeHGlobal(ptr);

Christof

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