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I have a C++ dll which has a function within it I am trying to call from a C# application. Here's the code in the C++ header file extern "C" _declspec(dllexport) int LabelStoringSSDsim(int devNum, UCHAR serial[40], UCHAR wwn[40], UCHAR ConfigID[5], UCHAR FrmRev[8], UCHAR DevName[40], int eCode); Here's the code in the C++ source file int LabelStoringSSDsim(int devNum, UCHAR serialLbl[40], UCHAR wwnLbl[40], UCHAR ConfigID[5], UCHAR FrmRev[8], UCHAR DevName[40], int eCode) { string strConfigID="12111"; //5 bytes string strFrmRev="1.25...."; //8 bytes string strDevName="ABC-123................................."; //40 bytes for (int i=0;i<5;i++) ConfigID[i] = strConfigID[i]; for (int i=0;i<8;i++) FrmRev[i] = strFrmRev[i]; for (int i=0;i<40;i++) DevName[i] = strDevName[i]; return eCode; } Here's the C# relevant code [DllImport("LabelStoring.dll")] static extern int LabelStoringSSDsim( int devNum, byte[] strserial, byte[] strwwn, [In] ref byte[] ConfigID, [In] ref byte[] FrmRev, [In] ref byte[] DevName, int eCode ); int errNum = LabelStoringSSDsim(devNum, bserial, bwwn, ref ConfigID, ref FrmRev, ref DevName, 123123); So when I get to the last bit of code there I get the "Attempted to read or write protected memory. This is often an indication that other memory is corrupt." error. I have no prior experience in importing DLL's like this and I've done a lot of searching but cannot seem to find a solution to the problem. I tried starting over from scratch with a simple function returning an integer, and that worked. Then I added an int for me to pass to the function and it still worked. Then I added a byte array for me to pass, which worked. Then I atte

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