C file read/write

Lars

Hi,
i'm trying to read in hex values generated by one program into another.
I start by writing the values to file using redirection as:

outputfile.exe > random.dat

then I'm trying to use the following code to read in the values

fp = fopen("random.dat", "rb");
int getc(FILE *fp);
char c=0;

for(int i=0;i<sizeOfArray;i++)
{

while((c=fgetc(fp))!=EOF){
c=fgetc(fp);
input_Array=c;
printf("\n%x",input_Array);
i++;
}

}
My output from printf isn't the hex values. It appears ot be ASCII equivalents for the hex values. When I open the file it look slike the data is correct. How do I get the hex values from the file back into an array where I can manipulate them?

Thanks

L

ast

Have a look at the fread function.

http://www.cprogramming.com/tutorial/cfileio.html is the best reference I managed to find. Hope this helps.

robfitz

Lars wrote:

i'm trying to read in hex values generated by one program into another.

Can you give us an example of the first programs output? For example something like this:
01 34 8f ae 00 26 c7 82 ab ....

So for this example the basic steps are, read the first character, convert to a number, shift number by 4 bits, read the second character, convert to a number, add the two numbers, skip white space, and repeat until the end of the file.