#include <stdio.h>
#define Input_Length_fileName 25 /*maximum letter for Input*/
#define Input_Length_description 80 /*maximum letter for Input*/
#define DataSize 200 /*maximum letter for one pic*/
#define Maximun_Picture 20 /*maximum photos in recoude*/
typedef struct picture_Data{
char fileName[Input_Length_fileName];
char description[Input_Length_description];
char location[Input_Length_fileName];
int peopleCount;
} pic;
#define PIC_FILE "Pic.dat"
int readFile (pic *entries){//[, int pic_order] : Not required If you are reading all.
FILE * infile;
int count = 0;
char line[DataSize];
if(NULL == (infile = fopen(PIC_FILE, "r")))// "r" : text file
return 0;
//count = fread(entries, sizeof(pic), Maximun_Picture, infile);//for fwrite
while (fgets(line, DataSize, infile)!=NULL){
sscanf(line, " %[^,],%[^,],%[^,],%d",
entries[count].fileName, entries[count].description, entries[count].location, &entries[count].peopleCount);
if(++count >= Maximun_Picture)
break;
}
fclose(infile);
return count;
}
int main(){
pic picture_record[Maximun_Picture];
int pic_recorded_number = readFile(picture_record);
printf("%d\n", pic_recorded_number);
printf("%s\n", picture_record[0].description);
printf("%d\n", picture_record[0].peopleCount);
return 0;
}
C Reading multiple structs from text
Pergunta
Hey I have been trying to read multiple structs from a text file and count how many structs have been read in my project.
this is my struct:
#define Input_Length_fileName 25 /*maximum letter for Input*/
#define Input_Length_description 80 /*maximum letter for Input*/
#define DataSize 200 /*maximum letter for one pic*/
#define Maximun_Picture 20 /*maximum photos in recoude*/
typedef struct picture_Data
{
char fileName[Input_Length_fileName];
char description[Input_Length_description];
char location[Input_Length_fileName];
int peopleCount;
}pic;
this is the reading structs function:
#define PIC_FILE "Pic.dat"
int readFile (pic *entries, int pic_order){
FILE * infile;
int count = 0;
char line[DataSize];
infile = fopen(PIC_FILE, "rb");
if (infile != NULL)
{
count = fread(entries, sizeof(pic), Maximun_Picture, infile);
while (fgets(line, DataSize, infile)!=NULL)
{
sscanf(line, "%s,%s,%s,%d", &entries[pic_order].fileName, &entries[pic_order].description, &entries[pic_order].location, &entries[pic_order].peopleCount);
}
fclose(infile);
}
entries[count].fileName[0]= '\0';
return count;
}
this is how the text file
photo1,I love this photo1,Helsinki,20
photo2,I love this photo2,Pari,30
this is how I call it
for ( i = 0; i < Maximun_Picture; i++)
{
pic_recorded_number = readFile(&picture_record[i],i);
}
printf("%d\n", pic_recorded_number);
printf("%d\n", picture_record[0].peopleCount);
I know it is not right. Can somebody tell me what s wrong and how to fix it? Thank you very mych!!
Solução
Outras dicas
I (almost) wish *scanf functions were never invented.
This will easily break; consider a ,
in the description (or any of the string fields).
Make life easy on yourself and don't reinvent the wheel: use a library that implements a common data interface, such as CSV.
(Granted, in C there are none in the standard library).
Take at look at this SO question: Parse CSV file in C
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