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unable to use fread() function

Pavab b

Hi,

I am working on MCB2300 (with LPC2378 processor). I have written a small function that will read the values into a matrix. But when the control comes to fread it completely hangs up, nothing can be done. Below is the my function which is giving problem

 void loadImage(FILE* arq, unsigned char** Matrix){
        int i,j;
        unsigned char tmp;
        long pos = 51;

        fseek(arq,0,0);

        for (i=0; i<300; i++){
                for (j=0; j<400; j++){
                        pos+= 3;
                        fseek(arq,pos,0);
                        fread(&tmp,3,1,arq);
                        Matrix[i][j] = tmp;
                }
        }
}

Its working fine in GNU C. But when I have tried to use the same code in Keil uVision4, its is not working. Please let me know how to sort this problem

Parents
  • 0 in reply to Andy Neil

    I have defined a matrix like below

    unsigned char bitmap[320][240]

    After that I allocated the some elements into that matrix before reading pixel values to make sure whether all elements in the matrix are initialised in the following manner

    for (i=0;i<320;i++){
   for (j=0;i<240;j++){
                 bitmap[i][j]=j;
                       }
                   }

    After this I am trying to print the values read in to the matrix using printf statement inthe following manner

    for (i=0;i<320;i++){
   for (j=0;i<240;j++){
                 printf(" %d ", bitmap[i][j]);
                       }
                   }

    Once done I have compiled it. Compilation is done but I could n't run it. Nothing is printed

Reply
  • 0 in reply to Andy Neil

    I have defined a matrix like below

    unsigned char bitmap[320][240]

    After that I allocated the some elements into that matrix before reading pixel values to make sure whether all elements in the matrix are initialised in the following manner

    for (i=0;i<320;i++){
   for (j=0;i<240;j++){
                 bitmap[i][j]=j;
                       }
                   }

    After this I am trying to print the values read in to the matrix using printf statement inthe following manner

    for (i=0;i<320;i++){
   for (j=0;i<240;j++){
                 printf(" %d ", bitmap[i][j]);
                       }
                   }

    Once done I have compiled it. Compilation is done but I could n't run it. Nothing is printed

Children
  • 0 in reply to Pavab b

    Once done I have compiled it. Compilation is done but I could n't run it. Nothing is printed

    You keep ignoring my suggestions. What's the point in posting about your problems when you ignore the responses?
    How much RAM do you have? Do you have enough of it to hold your bitmap?
    If you define a variable at function scope (a so-called automatic variable), memory for it will be allocated on the stack. I am certain that your stack is not large enough to hold a variable that is 75 Kbytes in size. Hence, the program will not work.

  • 0 in reply to Mike Kleshov

    In fact, you seem to ignore all responses from all posters!

    "Compilation is done but I could n't run it"

    There you go again - a meaningless statement!

    Why couldn't you run it?

    What, exactly, prevented you from running it?

    What debugging have you done to find the problem?