Passing Unsigned values by reference for COM objects

Jason Smiley

So I have a COM library that uses 3 parameters which take in Uints. These ints are in C++ so it should be an unsigned Long in VB 6.0 but there is no ULONG in VB 6.0. How do I call the function and still get it to compile?


example code

myCOMObject.WaitForData(ID, Size, DataString, Waitresponse, 1)

ID, Size, and Wait Response are all supposed to be ULONGs. What should I use instead?

Nov 15 '06 #1

Killer42

So I have a COM library that uses 3 parameters which take in Uints. These ints are in C++ so it should be an unsigned Long in VB 6.0 but there is no ULONG in VB 6.0. How do I call the function and still get it to compile?


example code

myCOMObject.WaitForData(ID, Size, DataString, Waitresponse, 1)

ID, Size, and Wait Response are all supposed to be ULONGs. What should I use instead?

Have a look at http://support.microsoft.com/kb/q189323/
Among other things it mentions...
UnsignedToLong
The function takes a Double containing a value in the range of an unsigned Long and returns a Long that you can pass to an API that requires an unsigned Long.

Nov 15 '06 #2