Question

每当我使用fscanf读取文件内容时，在这种情况下是国家名称后面跟一个空格，国家资本后跟一个空格，然后是人口，它会被成功读取，直到名称为国家不同，如阿拉伯联合酋长国＆＃34;。我使用了我能找到的所有建议，但在新的线路运营商之前似乎仍无法解析。相反，它会在联合之后停止扫描，并让fscand的酋长国读入我的国家资本价值，然后将所有东西都抛弃。任何建议都会有所帮助，因为我是一个相当新的程序员。

terminal

 egypt                  cairo 81015887.000000
 madagascar             antanonariva 21926221.000000
 zimbabwe               harare 12521000.000000
 united                 arab 0.000000   
 mirates                abu 0.000000   
 habi                    8264070 0.000000   
 nited                     states 0.000000   
 ashington,                         d. 0.000000   
 .                  312642000 0.000000   
 osnia                herzegovina 0.000000

的main.cpp

#include <stdio.h>    //for testing within main
#include <string.h>  //for testing within main
#include <stdlib.h>
#include "headers.h"

int main()
{   
    int size, i, g;  //size of countries that will be read in
char usrC;   //user choice
FILE * fileP;
char UI[25];

Country * c[10];

ask(UI);
size = oSesame(UI, fileP, c);

if(size==0)     //if file returns as empty
{
    return 0;
}

for(g=0;g<size;g++)
{
    printf("%s %26s %-11lf\n ", c[g]->cntName, c[g]->capName, c[g]->population);

}


return 0;
}

header.h

#define COUNTRY_MAX 10
#define MAX_COUNTRY_LENGTH 25
#define MAX_CAPITAL_LENGTH 25

typedef struct country
{
    char cntName[MAX_COUNTRY_LENGTH];
    char capName[MAX_CAPITAL_LENGTH];
    double population;

}Country;

int ask(char * usrTxt);
int oSesame(char usrTxt[], FILE * pFile, Country * p[]);

promp.c

 #include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "headers.h"


int ask(char * usrTxt)
{
    int length;
    printf("Enter text file to read from :  ");
    scanf("%s", usrTxt);
    length = strlen(usrTxt);
}



int oSesame(char usrTxt[], FILE * pFile, Country * p[10])
{

int count = 0;
int savedOffset;
pFile = fopen(usrTxt, "rw");

if(pFile != NULL)
{
    savedOffset = ftell(pFile);  //save how far from beginning of file we start
    fseek(pFile, 0, SEEK_END);   //seek to end of file

    if(ftell(pFile) == 0)       //if end of file is same location as beginning then file is empty
    {
        printf("File %s is empty", usrTxt);   
        return 0;           //end program

    }
    else{   
        fseek(pFile, savedOffset, SEEK_SET);        //set location indicator to beginning to begin parsing

        while(count<COUNTRY_MAX && !feof(pFile))
        {
            p[count] = (Country *) malloc(sizeof(Country));   //allocate memory for our structures since they havnt actually been declared yet just pointers to potential ones
            fscanf(pFile, "%s[^\n]", p[count]->cntName); //read in as string until newline character found in regex
            fscanf(pFile, "%s[^\n]", p[count]->capName);                
            fscanf(pFile, "%lf", &p[count]->population);
            getc(pFile);  //get new line character

            count++;
        }
        fclose(pFile);
    }
}
else
{
    printf("Error opening %s , check your spelling and try again.\n", usrTxt);
}
return count;

解析帮助，fscanf直到新行字符才读

0 个答案: