Code to store PGM file as a workable array

I've been hacking my brais trying to figure this out and all the resources I keep using get me errors. I'm using Dev-C++ and I can't figure out the code to simply take a pgm file (let's call it test.pgm) and open it or read it and then store it as a 2D array. Is there a function like in MATLAB or something. In MATLAB it's rather simple. All you do is:

Code:

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A = imread('test.pgm');

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This will put the image in matrix A, and then you can play arround with it from there. How does this work in Dev-C++?

it looks to me like you can skip (or take in) the first four lines, and then take in one line at a time into a two-dimensional char array... for example:

Code:

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char matrix[90][90];
int index=0;

ifstream infile("something.pgm");

infile.ignore(1000'\n');  //ignore the first line
infile.ignore(1000'\n');  //these can also be changed to
infile.ignore(1000'\n');  //infile.getline(...) so that you
infile.ignore(1000'\n');  //can use the data if need be.

while(!infile.eof())
{
  infile.getline(matrix[index],90,'\n');
  index++;
}

infile.close();

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for ifstream, you'll need to #include <fstream>

I don't know much (really anything) about .pgm files, but I used google to find this page... you may then want/need to go through this matrix and convert each char to an integer and put it in an integer matrix...

major, your code doens't work. You ignore the image resolution, and use a fixed size array, when the image can be any size.
I have code to read the image in C, if you want I'll post it.
Meanwhile

Code:

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unsigned char* readPGMImage(const  char *filename, int* height, int* width, int* grayscale){
        //open the file to read
        //read 1st 2 chars: have to match P5
        //then skip all lines (ended with '\n') started with #
        //read 3 ints: width, height, grayscale
        //start reading info which is width*height bytes big to a buffer
        //close file and return buffer
}

---

it works, but you have to modify it to make it do what you want... I'm not going to hand-code everything for everybody... and I already said I didn't know what the file was really for... the OP called for putting it into a matrix, so I put it into a matrix for them... and I provided for the first few lines of input... the size of the matrix need not be hardcoded, just don't allocate the space until after you read the first four lines...

Thanks everyone, yeah I found that resource too online, but the PGM files weren't in the format given in the text file you linked, I got some help with this and I'm banging throught the program now, thanks all.