How to write a full string to a file?

I'm programming in Windows right now, but portable code would be welcomed too.

What I'm using right now is fwrite(4), but this function needs a maximum number of elements to be wri开发者_JAVA百科tten to the file. I can use strlen(1) here but I'd like to know if there is any better way to do this.

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Use fputs instead:

FILE * f = fopen( "myfile.txt", "w" );
fputs( "Hello world\n", f );

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You can use fputs, but using functions that require the size to be written are safer (buffer overrun).

So, IMHO, using fwrite would be the preferred choice.

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You might check for a null within the expected length first.