Binary File

[Bob Dylan Lover]

I need to write some data to a binary file.

What is the proper fopen() arguments for opening a binary file for writing, and which function do I use to write to the file? fgets() or fwrite()?

I am writing a structure of data to file.

struct frameInfo {
float ssmTime;
int data;
};

struct frameInfo frame[16];


A little help with the arguments for doing this would be appreciated.

Thanks.

[Salem]

FILE *fp = fopen( "file", "wb" );
fwrite( frame, sizeof(struct frameInfo), 16, fp );

This should write the whole array in one simple step

[Bob Dylan Lover]

Thanks. The fwrite() command gave me a compiler error. Do I need to type cast the first argument?

error C2664: 'fwrite' : cannot convert parameter 1 from 'struct frameInfo' to 'const void *'
No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
Error executing cl.exe.

[Bob Dylan Lover]

&frame


Thanks for the help!

[Salem]

> &frame
Wait a minute, I thought you were writing an array of these, not a single instance.

Hope you replaced 16 with 1 in my example, otherwise you're writing too much data