我是 C 新手，我正在尝试找到一种方法来读取csv文件并输出行中的第五个文本，直到 eof
我的数据如下所示：
05/02/2012 00:00:01.548,XOLT,1ZE86V280394811433,trackthepack,23.22.11.82,en_US, 2012 年 5 月 2 日 00:00:01.605,XOLT,1ZVzVrZVhOaGNtUnZi,hadees,50.16.401/en_US. /2012 00:00:01.647,XOLT,1ZbWhoY21GMGFHRnVY,hadees,50.19.203.230,en_US,VE 05/02/2012 00:00:02.275,XOLT,1Z4217060300279193,trackthepack,107.22,059/_.246,en :00:02.599,XOLT,1Z9X98040398954479,Cascademfg,66.117.15.81,en_US,NF 05/02/2012 00:00:02.639,XOLT,1Z3X252W0363295735,trackthepack,107.22.101.79,en
我需要读取这个文件并存储第五个文本的值（例如 23.22.11.82）并使用它进一步处理匹配。
在java中，我使用下面的代码来拆分出csv行
String delims = "[,]";
while ((s1 = in.readLine()) != null && s1.length() != 0){
String[] tokens = s1.split(delims);
C中有类似的方法吗？如果我在 C 中运行它，我的代码运行得更快，这就是原因。
我能够尝试一些 c 代码，并且能够读取文件（3 条记录），但它似乎没有看到行尾，并且我遇到了分段错误。我正在使用 fgets 和 strtok
输入文件是由逗号（，）分隔的可变长度文件分隔符，我想获取每行中的第五个标记，然后将其用作查找键
这是代码：
#include "GeoIP.h"
#include "GeoIPCity.h"
static const char * _mk_NA( const char * p ){
return p ? p : "N/A";
}
int
main(int argc, char *argv[])
{
FILE *f;
FILE *out_f;
GeoIP *gi;
GeoIPRecord *gir;
int generate = 0;
char iphost[50];
char *nextWordPtr = NULL;
int wordCount =0;
char *rechost;
char recbuffer[1000];
char delims[]=",";
const char *time_zone = NULL;
char **ret;
if (argc == 2)
if (!strcmp(argv[1], "gen"))
generate = 1;
gi = GeoIP_open("../data/GeoIPCity.dat", GEOIP_MEMORY_CACHE);
if (gi == NULL) {
fprintf(stderr, "Error opening database\n");
exit(1);
}
f = fopen("city_test.txt", "r");
if (f == NULL) {
fprintf(stderr, "Error opening city_test.txt\n");
exit(1);
}
out_f = fopen("out_city_lookup_test.txt", "w");
if (out_f == NULL) {
fprintf(stderr, "Error opening out_city_lookup_test.txt\n");
exit(1);
}
//** Read the file line by line and get the ip address to use to lookup GeoIP **//
//* while (!feof(f)) {
while (fgets(recbuffer,1001,f) != NULL {
nextWordPtr = strtok (recbuffer,delims);
while (nextWordPtr != NULL & wordCount < 5) {
printf("word%d %s\n",wordCount,nextWordPtr);
if (wordCount == 4 ) {
printf("nextWordPtr %s\n",nextWordPtr);
strcpy(iphost, nextWordPtr);
printf("iphost %s\n",iphost);
}
wordCount++;
nextWordPtr = strtok(NULL,delims);
}
gir = GeoIP_record_by_name(gi, (const char *) iphost);
if (gir != NULL) {
ret = GeoIP_range_by_ip(gi, (const char *) iphost);
time_zone = GeoIP_time_zone_by_country_and_region(gir->country_code, gir->region);
printf("%s\t%s\t%s\t%s\t%s\t%s\t%f\t%f\t%d\t%d\t%s\t%s\t%s\n", iphost,
_mk_NA(gir->country_code),
_mk_NA(gir->region),
_mk_NA(GeoIP_region_name_by_code(gir->country_code, gir->region)),
_mk_NA(gir->city),
_mk_NA(gir->postal_code),
gir->latitude,
gir->longitude,
gir->metro_code,
gir->area_code,
_mk_NA(time_zone),
ret[0],
ret[1]);
fprintf(out_f,"%s\t%s\t%s\t%s\t%s\t%s\t%f\t%f\t%d\t%d\t%s\t%s\t%s\n", iphost,
_mk_NA(gir->country_code),
_mk_NA(gir->region),
_mk_NA(GeoIP_region_name_by_code(gir->country_code, gir->region)),
_mk_NA(gir->city),
_mk_NA(gir->postal_code),
gir->latitude,
gir->longitude,
gir->metro_code,
gir->area_code,
_mk_NA(time_zone),
ret[0],
ret[1]);
GeoIP_range_by_ip_delete(ret);
GeoIPRecord_delete(gir);
}
}
GeoIP_delete(gi);
fclose(out_f);
return 0;