How to marshal int* in C#?

Posted by MartyIX on Stack Overflow See other posts from Stack Overflow or by MartyIX
Published on 2010-04-28T20:38:56Z Indexed on 2010/04/29 0:17 UTC
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Hi,

I would like to call this method in unmanaged library:

void __stdcall GetConstraints(

  unsigned int* puiMaxWidth,

  unsigned int* puiMaxHeight,

  unsigned int* puiMaxBoxes

);

My solution:

  • Delegate definition:

    [UnmanagedFunctionPointer(CallingConvention.StdCall)] private delegate void GetConstraintsDel(UIntPtr puiMaxWidth, UIntPtr puiMaxHeight, UIntPtr puiMaxBoxes);

  • The call of the method:

    // PLUGIN NAME
    GetConstraintsDel getConstraints = (GetConstraintsDel)Marshal.GetDelegateForFunctionPointer(pAddressOfFunctionToCall, typeof(GetConstraintsDel));
    
    
     uint maxWidth, maxHeight, maxBoxes;
    
    
     unsafe
     {
        UIntPtr a = new UIntPtr(&maxWidth);
        UIntPtr b = new UIntPtr(&maxHeight);
        UIntPtr c = new UIntPtr(&maxBoxes);
        getConstraints(a, b, c);
     }
    

It works but I have to allow "unsafe" flag. Is there a solution without unsafe code? Or is this solution ok? I don't quite understand the implications of setting the project with unsafe flag.

Thanks for help!

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