double Time;
...
WriteFile( tmp_pipe, Time, sizeof(double), &dwWritten, NULL );
The above reports :
error C2664: 'WriteFile' : cannot convert parameter 2 from 'double' to 'LPCVOID'
views:
33answers:
1
+2
A:
You want &Time, not Time, for parameter 2 of the function call.
Carl Norum
2010-09-05 03:52:26
Thanks,do you know what `LPC` means in `LPCVOID`?
2010-09-05 03:54:42
Long Pointer Const Void ? - basically a pointer to any data type.
John Boker
2010-09-05 03:59:01
Long Pointer to a Constant void type. Basically just a pointer to constant data of any kind. Link: http://msdn.microsoft.com/en-us/library/aa383751(VS.85).aspx
Carl Norum
2010-09-05 03:59:11
But `Time` isn't a constant in my case,how?
2010-09-05 04:09:56
@user198729, in this case the function is indicating that it will not modify the contents of your buffer. As far as `WriteFile` is concerned, the data is constant. You don't need to worry about it changing during the call.
Carl Norum
2010-09-05 04:13:16