Question

I have following piece of C++ code that needs to be C Sharped.

int* pData = new int[128];
for(int i = 0; i < 128; i++)
{ pData[i] = i*2 ;}

This pData int* is later passed to a function as void*

Now I need to put all this in C#. What I have done is as follows,

Int32[] tempData = new Int32[128];
for(int i = 0; i < 128; i++)
{ tempData[i] = i*2 ;}
int size = Marshal.SizeOf(tempData[0]) * tempData.Length;
IntPtr ptrData = Marshal.AllocHGlobal(size);
Marshal.Copy(tempData, 0, ptrData, tempData.Length);

Later I pass the ptrData to the C# function.But I get the run time error : Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

Thanks in Advance.

Answer 1

int size = sizeof(int) * tempData.Length;
IntPtr ptrData = Marshal.AllocHGlobal(size);
Marshal.Copy(tempData, 0, ptrData, size);

Should do the trick…