C语言 文件 用法 不知道这个错误是什么意思 想读取一个csv文件 文件也保存了
问题描述：
#include<stdio.h>
#include<string.h>
int main(){
FILE *fp = NULL;
char *line,*record;
char buffer[1024];
if((fp = fopen("c:\\menu.csv", "r")) != NULL)
{
fseek(fp, 0L, SEEK_SET); //定位到第二行，每个英文字符大小为1
char delims[] = ",";
char *result = NULL;
int j = 0;
while ((line = fgets(buffer, sizeof(buffer), fp))!=NULL)//当没有读取到文件末尾时循环继续
{
record = strtok(line, ",");
while (record != NULL)//读取每一行的数据
{
if (strcmp(record, "Ps") == 0)//当读取到Ps那一行时，不再继续读取
return 0;
printf("%s ", record);//将读取到的每一个数据打印出来
if (j == 3) //只需读取前9列
break;
record = strtok(NULL, ",");
j++;
}
printf("\n");
j = 0;
}
fclose(fp);
fp = NULL;
}
}
是不是不能在vscode上面读出表格啊？
答
record = strtok(buffer, ",");
答
刚又查了一下：
fgets, fgetws
Get a string from a stream.
char *fgets( char *string, int n, FILE *stream );
wchar_t *fgetws( wchar_t *string, int n, FILE *stream );
Function Required Header Compatibility
fgets <stdio.h> ANSI, Win 95, Win NT
fgetws <stdio.h> or <wchar.h> ANSI, Win 95, Win NT
For additional compatibility information, see Compatibility in the Introduction.
Libraries
LIBC.LIB Single thread static library, retail version
LIBCMT.LIB Multithread static library, retail version
MSVCRT.LIB Import library for MSVCRT.DLL, retail version
Return Value
Each of these functions returns string. NULL is returned to indicate an error or an end-of-file condition. Use feof or ferror to determine whether an error occurred.
Parameters
string
Storage location for data
n
Maximum number of characters to read
stream
Pointer to FILE structure
Remarks
The fgets function reads a string from the input stream argument and stores it in string. fgets reads characters from the current stream position to and including the first newline character, to the end of the stream, or until the number of characters read is equal to n – 1, whichever comes first. The result stored in string is appended with a null character. The newline character, if read, is included in the string.
fgets is similar to the gets function; however, gets replaces the newline character with NULL. fgetws is a wide-character version of fgets.
fgetws reads the wide-character argument string as a multibyte-character string or a wide-character string according to whether stream is opened in text mode or binary mode, respectively. For more information about using text and binary modes in Unicode and multibyte stream-I/O, see Text and Binary Mode File I/O and Unicode Stream I/O in Text and Binary Modes.
Generic-Text Routine Mappings
TCHAR.H Routine _UNICODE & _MBCS Not Defined _MBCS Defined _UNICODE Defined
_fgetts fgets fgets fgetws
Example
/* FGETS.C: This program uses fgets to display
* a line from a file on the screen.
*/
#include <stdio.h>
void main( void )
{
FILE *stream;
char line[100];
if( (stream = fopen( "fgets.c", "r" )) != NULL )
{
if( fgets( line, 100, stream ) == NULL)
printf( "fgets error\n" );
else
printf( "%s", line);
fclose( stream );
}
}
Output
/* FGETS.C: This program uses fgets to display
Stream I/O Routines
See Also fputs, gets, puts
我之前的回复
record = strtok(buffer, ",");
改不改是一回事。