Thread: Help with pointers and ppm images

Hello everyone. I have a program that is getting errors when I try to call in functions. The functions are in a parse.o file that has been given to me. I am getting the following errors and I am having trouble understanding how to fix them. If anyone could help me with this I would be very grateful. Thank you

transform.c: In function âmainâ:
transform.c:14:14: error: expected expression before âFILEâ
transform.c:18:25: error: invalid operands to binary * (have âstruct pixel_t (*)[(long unsigned int)(g_width)]â and âlong unsigned intâ)
transform.c:20:13: error: expected expression before âFILEâ
transform.c:20:13: error: too few arguments to function âparseImageâ
transform.h:21:6: note: declared here



Here is the main file:

Code:

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

//void mirror(pixel_t *image, int x, int y);

int main(int argc, char *argv[])
{
    int n;
    int m;
    char *input;
    input=argv[1];

    parseHeader(FILE *input);

    pixel_t theArray[g_height][g_width];

    input = malloc(theArray*sizeof(pixel_t));

    parseImage(FILE *input, pixel *theArray);

    //char r = theArray[x][y].r
    //char g = theArray[x][y].g
    //char b = theArray[x][y].b
    
    printf("P6");
    printf("%d %d\n 255", g_height, g_width);


    switch (*argv[1])
        {
               case '1':
                    for(n=0; n <= g_height-1; n++)
            {
                for(m=0; m <= g_width-1; m++)
                {
                    printf("%c%c%c", theArray[n][m].r, theArray[n][m].g, theArray[n][m].b);
                    ++m;
                }
            }
        
                //mirror(image, width, height);
                break;
        case '2':
                //flip(image, width, height);
                break;
        case '3':
                //rotate(image, height, width);
                break;
        default:
                printf("Invalid command line argument. User must enter a 1, 2, or 3.\n");
                break;
    }

}

and here is my header file

Code:

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

typedef struct
{
    unsigned char r;
    unsigned char b;
    unsigned char g;
}     pixel_t;
 
 
pixel_t *input;

struct pixel {
    char r, g, b;
};

int g_width, g_height;

void parseHeader( FILE *input );
void parseImage( FILE *input, struct pixel *theArray);

Okay, so I changed the file so it includes fopen. I'm still having trouble with the second argument in parseImage.

transform.c: In function âmainâ:
transform.c:26:2: error: incompatible type for argument 2 of âparseImageâ
transform.h:21:6: note: expected âstruct pixel *â but argument is of type âpixel_tâ
transform.c:61:1: error: expected declaration or statement at end of input

Code:

int main(int argc, char *argv[])
{
    int n;
    int m;
    FILE *inFile;
    char *input;
    input=argv[1];

    inFile = fopen("tiger.ppm", "r");
        if (inFile == NULL){
        fprintf(stderr,"Output failure. Exiting program\n");
        exit(2);

    parseHeader(inFile);

    pixel_t theArray[g_height][g_width];

    struct pixel * input = (struct pixel *) malloc(sizeof(struct pixel)* g_width * g_height);

    parseImage(inFile, theArray[g_height][g_width]);