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Read/Write hex from/to a file in C?

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  • 25-03-2008 11:14pm
    #1
    AARRRGH
    Closed Accounts Posts: 12,382 ✭✭✭✭


    Hello

    I've googled this but I'm not getting much joy.

    Does anyone know of an easy way to read/write hex from/to a file in C?

    Thank you.


Comments

  • Options
    #2
    AARRRGH
    Closed Accounts Posts: 12,382 ✭✭✭✭AARRRGH


    OK I have reading in hex working, but writing out hex?
    void read(char *filename, unsigned char *message) {

		FILE *fp;

		fp=fopen(filename, "r");

		int i = 0;

		while(!feof(fp))  {
      			fscanf(fp, "%x", &message[i]);
      			i++;
		} 

		fclose(fp);
}


  • Options
    #3
    AARRRGH
    Closed Accounts Posts: 12,382 ✭✭✭✭AARRRGH


    Ah got it.
    void write(char *filename, unsigned char *message) {

		FILE *fp;

		fp=fopen(filename, "w");

		// i know i'm only going to write 8 bytes
		for(int x = 0; x <8; x++)
      			fprintf(fp, "&#37;x", message[x]);

		fclose(fp);
}


  • Options
    #4
    Evil Phil
    Registered Users Posts: 7,468 ✭✭✭Evil Phil


    unstoppable :pac:


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