Help with structure and createThread function call

[Pecan204]

I am not real clear on using structure statements and external function calls. I am getting the following errors when I compile the file below. Can someone hlep? Thanks. cinterface3.cpp(22) : error C2228: left of '.start' must have class/struct/union type cinterface3.cpp(24) : error C2664: 'CreateThread' : cannot convert parameter 3 from 'void (long *)' to 'unsigned long (__stdcall *)(void *)' cinterface3.cpp(30) : error C2228: left of '.time' must have class/struct/union type #include #include #include struct io { char time[10]; int start; }; struct io cio; extern "C" __declspec(dllimport) void _stdcall FTREND3 ( long * ); void main (void) { DWORD tid, cio; HANDLE hThread; cio.start = 1; hThread = CreateThread(NULL, 0, FTREND3, &cio, 0, &tid); CloseHandle(hThread); printf("In c after fortran thread started\n\n"); printf("string = %s\n",cio.time); }

[Joaquin M Lopez Munoz]

Two errors here:

1. cio is a DWORD, seems like you meant it to be a io:

   DWORD tid;
   io cio;

2. FTREND3 does not have the interface expected by CreateThread, as it accepts a long * where CreateThread wants a void *. In this particular case, you can simply force the cast:

   hThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)FTREND3, &cio, 0, &tid);

   Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

[Pecan204]

Thanks Joaquin.