c - Basic file I/O of a ppm file -


i'm trying write program read through .ppm file , keep data in struct. able though, need able open file, not working far. i'm doing wrong. can please take @ code , see if can find out what's problem? 

#include <stdio.h> #include <stdlib.h>  int readfile(char *filename);  int main(void) {     readfile("myfile.ppm");     return 0; }  int readfile(char *filename) {     int x = 0;     file *pfile;     pfile = fopen(filename, "rb");     if(!pfile)     {         fprintf(stderr, "unable open file %s\n", filename);         exit(1);     }      fscanf(pfile, "%d", &x);     fclose(pfile);     printf("%d\n", x);     return 0; }

this gives me "\n" on stdout. should fscanf array rather int?

based on feedback edited code scanning 2 chars:

int readfile(char *filename) {     char first, second = 0;     file *pfile;     pfile = fopen(filename, "rb");     if(!pfile)     {         fprintf(stderr, "unable open file %s\n", filename);         exit(1);     }      fscanf(pfile, "%c%c", &first, &second);     fclose(pfile);     printf("first: %c, second: %c\n", first, second);     return 0; }

according http://en.wikipedia.org/wiki/netpbm_format file starts 2 byte sequence: p1, p2, p3 (as human readable text - ascii). reading int not work. should read in char (for p) , char number , find out format file is. depending on format take further steps.


Comments

Post a Comment

Popular posts from this blog

android - Get AccessToken using signpost OAuth without opening a browser (Two legged Oauth) -

i using signpost oauth access data magento server. have read various tutorials on same , reach point open browser user can enter credentials. however, per requirement have automate part. hence, user should not browser page. have set-up done on server side ( magento ), hit url , returned call page. same through program in android. i have tried below, consumer = new commonshttpoauthconsumer(key, secret); provider = new commonshttpoauthprovider(oauth_init_url,access_token_url, authorize_url); try { provider.retrieverequesttoken(consumer, oauth.out_of_band); log.d("tokens" , consumer.gettoken() + " -- " + consumer.gettokensecret()); } and request tokens. dont know how bypass next step. tried directly accessing accesstoken (stupid of me) provider.retrieveaccesstoken(consumer, "mycallback://callback"); no luck, ends in oauth.signpost.exception.oauthnotauthorizedexception: authorization failed (server replied 401). ...
Read more

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: mockito -

getting error org.mockito.exceptions.misusing.invaliduseofmatchersexception: invalid use of argument matchers! 1 matchers expected, 2 recorded. exception may occur if matchers combined raw values: //incorrect: somemethod(anyobject(), "raw string"); when using matchers, arguments have provided matchers. example: //correct: somemethod(anyobject(), eq("string matcher")); at when( getprogramservice .callservice(any(getprogramtype.class))) .thenreturn(jaxbresponse); please explain error , possible resolution the code posted looks fine; don't see problem it. code before or above causing exception. key here: invalid use of argument matchers! 1 matchers expected, 2 recorded. any , used above, doesn't return "special kind of null" or "special kind of getprogramtype"; don't exist. instead, returns null , side effect puts matcher on stack. whe...
Read more

google shop client API returns 400 bad request error while adding an item -

i'm working on solution add items in google shopping market java application. following tutorial real mess because of missing classes of laste release, after setting 1.5-beta maven managed make base example typecheck correctly classes. still can make simple task of adding 1 item. instead of posting whole code i'm posting part creates product feed. private product createproduct(string id) { product product = new product(); product.title = "red wool sweater"; product.content = new content( "text", "comfortable , soft, sweater keep warm on " + "cold winter nights. red , blue stripes."); product.appcontrol = new appcontrol(); product.appcontrol.addrequireddestination("productads"); product.externalid = id; product.lang = "it"; product.country = "it"; product.condition = "nuovo"; product.price = new price("eu...
Read more