Is there a way to copy one single or doublevalue to IntPtr. Marshal.Copy takes an array of double or single. I wish totransfer data from the managed code (which uses ADO.NET ) to a inproc COM object in the same apartment.I'mpassing the address of thefield variables in COM object as IntPtr array to the managed code to transfer the whole row (fetched using DataReader)in one callfrom the managed assembly.

You can easily just wrap your single or double value into an array, and use Marshal.Copy's current overload. For example, for a Single value:

void CopyToPointer(IntPtr copyTarget, float myFloat)
{
Marhsall.Copy(new float[] { myFloat }, 0, copyTarget, 1);
}


The result of this will be identical, since you're copying by value in any case.

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Reed Copsey, Jr. - http://reedcopsey.com