• C

Converting image file into strings

Hi, i got a question here is tat I wanna convert a image file(e.g. JPEG, bmp) into Strings and save them into the buffer, Do u guys the code i need to achieve this?? thz a lot!!
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You just want to read an entire file into a buffer?

#include <stdio.h>
#include <stdlib.h>

long fsize(FILE *fp) {
    /* is there an easier standards-compliant (including working on winders) way to get file size? */

    long origpos, filesize;

    if((origpos = ftell(fp)) == -1)
        return -1;

    if(fseek(fp, 0, SEEK_END) != 0)
        return -1;

    if((filesize = ftell(fp)) == -1)
        return -1;

    if(fseek(fp, origpos, SEEK_SET) != 0)
        return -1;

    return filesize;

int main(int argc, char *argv[]) {
    FILE *fp;
    char *buffer;
    long filesize;

    if(argc != 2) {
        fprintf(stderr, "Usage: %s filename\n", argv[0]);
        return 1;

    fp = fopen(argv[1], "r");
    if(!fp) {
        return 1;

    filesize = fsize(fp);
    if(filesize == -1) {
        return 1;

    buffer = (char*)malloc(filesize);
    fread(buffer, filesize, 1, fp);
    if(ferror(fp)) {
        return 1;


    /* do whatever you want with buffer */

    return 0;

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How exactly do you want to convert an image into strings?

You mean convert white pixels to  spaces and dark pixcels to asterisks?

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