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Im trying to call mumble from delphi and it gpfs whats up

Based on the number of postings to comp.lang.pascal, it would seem that by far the largest number of problems calling Windows API functions or non- Delphi DLLs are caused by passing Pascal-style strings to functions that expect null-terminated (PChar) strings. This is the first thing you should check if you get a GPF or other strange results when calling an external function. See section 5.12 for more information on which type of strings go where.