Binary I/O Problems

[jmeyer]

Hello All!
I'm working on a bit of code and I ran into a problem. I am trying to make a program that writes data to a binary file. When the program is run again later (presumably after being terminated) it is supposed to read in the old directory file (also in binary). I am confident the data written is good (after viewing it in a hex editor), but since the data is a mixture of characters and integers, I am having trouble retrieving both the characters and the integers.
I feel like I may be using the wrong method. Any suggestions?

void getIndex()
{
	char Line[8];
	char *Tok;
	int count = 0;

	int *rawOffset;

	printf("Retrieving index: Please wait...");	

	while (fgets((char *) Line, sizeof(IndexDat), inDir) != NULL )
	{	
		Tok = strtok( Line, "\0");
		strncpy(&iDat[count].CCODE[0], Tok, 3);

		//The true offset is Line[4] to Line[7]
		rawOffset = &Line[4];
		iDat[count].offset = rawOffset;

		count++;
	fseek(inDir, 1, SEEK_CUR); //advance one more place to queue up the next entry
	}
	printf("All done. %d entries currently in database\n", count);

As it is, the code recovers some integer, but it seems to always be zero or "garbage". I was hoping to recover the data and store it in an array of matching structs for querying

If it helps, I am writing the data using;

fwrite(&iDat[c],sizeof(iDat[c]),1,outFile);

where iDat is the struct:

typedef struct
{
	char CCODE[4];
	long offset;
}IndexDat;

and c is an int and outFile is a FILE *

Thanks for your help!

[WaltP]

If you are using fwrite() you should probably be using fread() , not fgets()

[jmeyer]

If you are using fwrite() you should probably be using fread() , not fgets()

That sounds reasonable. Is there any way I can load the data into my struct? Otherwise, I'm not certain how to split the integer value from my char array...

[WaltP]

Do the reverse of how you got the data into the file. fread() and fwrite() can be thought of as direct opposites.