Thread: Using system calls with C program

I'm writing a program for work that needs to copy a file from a directory on one drive to another, e.g. from a flash drive to the hard drive. Originally I had planned on simply opening the file and using fread to read through the file and then using fwrite to "recreate" the file on the new drive. That code worked fine, but it doesn't do well for large files. A friend suggested using a system call to copy and paste the file from one drive to the other, but everything I'm finding on it refers to UNIX environments and there are several different examples. Since this program will only ever be used on Windows machines can I still use this system call idea and if I can, would you mind giving me some example code of where to start. From the White Bible to Google I've seen enough code that I've managed to confuse myself royally.

This is the code I have right now.

Code:

FILE *in;
FILE *out
                       
fopen=in("E:\\folderA\\%s"fileA, "rb")       //fileA is a *char[]
fopen=out("C:\\folderB\\fileB", "wb+")
                       
/*System Call to copy paste
This is where I originally had my fread command
and my fwrite command. */
                       
fclose(in);
fclose(out);

Thank you for your help!
Matrixaffiliate

I had originally wrote the program with fread()/fwrite() but when I sent the finished program to my manager he sent it back with instructions to use something other than those function calls.

I've heard of CopyFile() but I was under the impression that it was a C++ only command and didn't cross over into straight C. I take it that I'm mistaken on that?

Thanks for the heads up on "wb+". I hadn't realized that it was superfluous when the original data is going to be scrapped.

Originally Posted by Matrixaffiliate

I've heard of CopyFile() but I was under the impression that it was a C++ only command and didn't cross over into straight C. I take it that I'm mistaken on that?

Thanks for the heads up on "wb+". I hadn't realized that it was superfluous when the original data is going to be scrapped.

I don't think anything in the Windows API is C++.

Apparently the program will be moving files that are several GB in size, and he doesn't want the program to read through each file individually per say.

Thanks a lot Mats and tabstop. I really appreciate your help. I'll start running with CopyFile() and see if that's more along the lines of what my manager is looking for.

Thanks again for your help and advice. I really appreciate it.

Matrixaffiliate