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c#unsafe-pointers

Getting pointer for first entry in an array


I want to get pointer of first entry in the array. This is how I tried

int[] Results = { 1, 2, 3, 4, 5 };

unsafe
{
    int* FirstResult = Results[0];
}

Get following compilation error. Any ideas how to fix it?

You can only take the address of an unfixed expression inside of a fixed statement initializer


Solution

  • The error codes are magic to get the answer - search for error code (CS0212 in your case) and you get explanation with proposed fix in a lot of case.

    Search: http://www.bing.com/search?q=CS0212+msdn

    Result: http://msdn.microsoft.com/en-us/library/29ak9b70%28v=vs.90%29.aspx

    Code from the page:

       unsafe public void mf()
       {
          // Null-terminated ASCII characters in an sbyte array 
          sbyte[] sbArr1 = new sbyte[] { 0x41, 0x42, 0x43, 0x00 };
          sbyte* pAsciiUpper = &sbArr1[0];   // CS0212
          // To resolve this error, delete the previous line and 
          // uncomment the following code:
          // fixed (sbyte* pAsciiUpper = sbArr1)
          // {
          //    String szAsciiUpper = new String(pAsciiUpper);
          // }
       }