我有一个存档 results.csv
,我需要读取该存档的前两行,拆分第二行并将其打印在 output.txt
上。不知怎的,它没有打印任何东西,但我不知道原因。
我没有添加我确信没问题的功能。
命令:a.c results.csv
第一行:
日期、home_team、away_team、home_score、away_score、锦标赛、城市、国家、中立
第二行:
18721130,苏格兰,英格兰,0,0,友好,格拉斯哥,苏格兰,FALSE
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
typedef struct
{
char *line1;
long int date;
char *h_team;
char *a_team;
int gols_h_team;
int gols_a_team;
char *reason;
char *city;
char *country;
char *neutral_field;
}Data;
void alloc_Data(Data *d, int size)
{
d->line1 = (char*)malloc(50*sizeof(char));
d->h_team = (char*)malloc(30*sizeof(char));
d->a_team = (char*)malloc(30*sizeof(char));
d->reason = (char*)malloc(30*sizeof(char));
d->city = (char*)malloc(30*sizeof(char));
d->country = (char*)malloc(30*sizeof(char));
d->neutral_field = (char*)malloc(9*sizeof(char));
}
void store(Data *d, FILE *input, FILE *output, int size)
{
fscanf(input, "%s", d[0].line1);
fprintf(output, "%s\n", d[0].line1);
for(int i = 1; i < size; i++)
{
fscanf(input, "%li,%[^,]s%[^,]s%d,%d,%[^,]s%[^,]s%[^,]s%[^,]s", &d[i].date, d[i].h_team, d[i].a_team, &d[i].gols_h_team, &d[i].gols_a_team, d[i].reason, d[i].city, d[i].country, d[i].neutral_field );
fprintf(output, "%li,%s,%s,%d,%d,%s,%s,%s,%s\n", d[i].date, d[i].h_team, d[i].a_team, d[i].gols_h_team, d[i].gols_a_team, d[i].reason, d[i].city, d[i].country, d[i].neutral_field );
}
}
int main(int argc, char *argv[])
{
FILE *input;
FILE *output;
char *string = "output.txt";
int size = 2;
open_input(argv, &input);
open_output(string, &output);
Data *d;
d = (Data*)malloc(size*sizeof(Data));
alloc_Data(d, size);
store(d, input, output, size);
free(d);
return 0;
}
最佳答案
OP 的 fscanf()
格式困惑,%[^,]
后面有一个 s
并且缺少 ,
。 @Gem Taylor
更好的选择是使用 fgets()
读取所有行。 (包括第一个)
// fscanf(input, "%li,%[^,]s%[^,]s%d,%d,%[^,]s%[^,]s%[^,]s%[^,]s",...d[i].neutral_field );
#define EXPECTED_MAX_BUFFER_SIZE 150
char buffer[EXPECTED_MAX_BUFFER_SIZE * 2]; // suggest using 2x expected max size
if (fgets(buffer, sizeof buffer, input)) {
然后使用 sscanf()
解析团队结果。在末尾使用 "%n"
是测试整个 sscanf()
是否成功且没有额外垃圾的简单方法。 sscanf()
应该受到宽度限制,复杂的扫描可以通过一些定义来管理说明符。注意 "%29[^,]"
s
int n = 0;
#define FDat "%li ,"
#define FScr "%d ,"
#define Ftxt " %29[^,],"
#define Fneu " %8[^,]"
sscanf(buffer, FDat Ftxt Ftxt FScr FScr Ftxt Ftxt Ftxt Fneu " %n",
&d[i].date, d[i].h_team, d[i].a_team,
&d[i].gols_h_team, &d[i].gols_a_team,
d[i].reason, d[i].city, d[i].country, d[i].neutral_field, &n);
if (n > 0 && buffer[n] == '\0') {
// success
fprintf(output, ...
} else {
// bad input
}
关于c - 分割长字符串,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50745686/