getting an ASCII char string from C# String

Question

Does anyone now how to pass a C# char to unmanaged C char? The big difference is the C char is an 8 bit char and a C# is 16 bit. I can use the encode method but that creates a byte[]. I can't figure this out. I have an unmanaged C function that I need to pass a string to but the C function is a zero terminated ascii string. I cannot find anything in C# to help me cast.

jenglish · Answer

I can do that but it creates a byte []. I tried this approach and it didn't work Everything I have read says I should be able to pass a string out to the unmanaged code but that doesn't work either. I am at a loss here I really can't figure this out. It says in the api the the DTMF string is a Zero Terminated ASCII string. that to me says it is a char [] in C how else can you get a zero terminated string. Anyway I still can't figure this out

james · Answer

I think the main problem you're having is that C# (and .Net) use Unicode (a 16 bit char set) as opposed to ASCII (8 bit). You can probably write a conversion by getting the unicode value of a char which will be a UInt32 and converting it to an 8 bit that can then become and ASCII char.