Thread: C# and DLL passing and retrieving data

Hello,

I have a C# program going and want to be able to call the DLL and receive back the data requested through a pointer.

Below is the DLL import within my C# code.

Code:

[DllImport("MyTest.dll")]
        public static extern int ReadNetwork(Byte[] ROM_ID);

Below is the code in the DLL

Code:

int _stdcall ReadNetwork(unsigned char* Array1)
{
	ReadDevice(readBackArray);
	for(i = 0; i < 20; i++)
	{
		Array1[i] = readBackArray[i];
	}

	return 1;
}

And below how I'mm calling the DLL and trying to print out the results.

Code:

int errorCheck;
byte[] testArray;
testArray = new byte[12];
string value;

errorCheck = ReadNetwork(testArray);
MessageBox.Show("Return Value: " + errorCheck.ToString());
value = ASCIIEncoding.ASCII.GetString(testArray);
MessageBox.Show("Array String: " + value);

I've tried changing the return values in the DLL's ReadNetwork() function and that works ok, so I know I'm calling the DLL and it runs ok, but printing the result back is where I'm having the problem. Any help will be appreciated.