需求:

txt、dat、csv文件很大,需要花很长的时间打开,

但实际上我们只需要查看文件的前几行,查看数据的内容和格式

exe & code :  https://github.com/congmingyige/preRead-first-few-lines-txt-dat-csv-

展示:

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alt="" />

代码:

 #include <iostream>
#include <cstdio>
#include <cstring>
#include <io.h>
#include <windows.h>
using namespace std; char addr[],s[],str[]; int main()
{
printf("preRead!\n");
printf("Please input (directory+)filename:\t");
///data.dat
///test.txt
///1.csv
///1.xlsx wrong!
///1.doc wrong!
gets(addr);
if (_access(addr,)!=-)
{
int i,limitLine; FILE *in_line=fopen("limitLine.txt","r");
fscanf(in_line,"%d",&limitLine);
fclose(in_line); FILE *in=fopen(addr,"r");
///若不清楚格式,按行读取
i=;
strcpy(str,"");
while (fgets(s,,in)!=NULL)
{
strcat(str,s);
if (i==limitLine)
break;
i++;
}
printf("%s",str);
fclose(in);
}
else
printf("File not exists\n");
system("pause");
return ;
}

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