C/C++在文件指定位置插入字符串或者空行

「爱情、让人受尽委屈。」 2022-09-24 05:16 376阅读 0赞

// test725.cpp : 定义控制台应用程序的入口点。  
//  
  
  
\#include "stdafx.h"  
\#include <iostream>  
using namespace std;  
  
  
\#include <stdio.h>  
  
  
int fun1()  
\{  
//添加Req和Ans  
FILE \*file = fopen("E:/test.aut","r+");  
if (!file)  
\{  
return -1;  
\}   
  
  
char \*strTollId = "83";  
char \*strVehicleId = "82";  
int iToolIdIndex = 0;  
int iVehicleIdIndex = 1;  
  
  
int iCount = 0;  
int iCountBeforeRead = 0;  
  
  
while(!feof(file))  
\{  
char buf\[500\] = \{0\};  
fgets(buf,sizeof(buf) - 1,file);  
//buf\[strlen(buf) - 1\] = '\\n';//去掉\\n  
//buf\[strlen(buf)\] = '\\n';//去掉\\n  
  
  
if (0 == strlen(buf))  
\{  
fclose(file);  
return -1;  
\}  
else if (1 == strlen(buf))  
\{  
iCount += 2;  
continue;  
\}  
else if (2 < strlen(buf))  
\{  
iCount += strlen(buf) + 1;  
\}  
  
  
char strFoundId\[3\] = \{0\};  
memcpy(strFoundId,buf + iVehicleIdIndex\*3,2);  
if (!strcmp(strFoundId,strVehicleId))  
\{  
char strReq\[504\] = \{0\};  
strcpy(strReq,"Req:");  
  
  
//先把插入位置后面的所有字符读取到临时文件中  
FILE \*tempFile = tmpfile();  
if (!tempFile)  
\{  
return -1;  
\}  
while (!feof(file))  
\{  
char bufTemp\[500\] = \{0\};  
fgets(bufTemp,sizeof(bufTemp) - 1,file);  
if(!feof(file))  
\{  
// bufTemp\[strlen(bufTemp) - 1\] = '\\r';//去掉\\n  
// bufTemp\[strlen(bufTemp)\] = '\\n';  
\}  
else  
\{  
//最后一个字节读出来的是F F,下面的处理是去掉中间空格  
// bufTemp\[strlen(bufTemp) - 2\] = bufTemp\[strlen(bufTemp) - 1\];  
// bufTemp\[strlen(bufTemp) - 1\] = 0;  
\}  
  
  
fwrite(bufTemp,1,strlen(bufTemp),tempFile);  
\}  
  
  
fseek(file,iCount - (strlen(buf) + 1),SEEK\_SET);  
strcat(strReq,buf);  
//strcat(strReq,"\\\\r\\\\n");  
fwrite(strReq,1,strlen(strReq),file);   
fflush(file);  
iCount += 4;  
  
  
fseek(tempFile,0,SEEK\_SET);  
while (!feof(tempFile))  
\{  
char bufTemp\[500\] = \{0\};  
fgets(bufTemp,sizeof(bufTemp) - 1,tempFile);  
if(!feof(tempFile))  
\{  
// bufTemp\[strlen(bufTemp) - 1\] = '\\r';//去掉\\n  
// bufTemp\[strlen(bufTemp)\] = '\\n';  
\}  
else  
\{  
//最后一个字节读出来的是F F,下面的处理是去掉中间空格  
// bufTemp\[strlen(bufTemp) - 2\] = bufTemp\[strlen(bufTemp) - 1\];  
// bufTemp\[strlen(bufTemp) - 1\] = 0;  
\}  
  
  
fwrite(bufTemp,1,strlen(bufTemp),file);  
\}  
  
  
fclose(tempFile);  
fflush(file);  
fseek(file,iCount,SEEK\_SET);  
\}  
else if (!strcmp(strFoundId,strTollId))  
\{  
char strAns\[504\] = \{0\};  
strcpy(strAns,"Ans:");  
  
  
//先把插入位置后面的所有字符读取到临时文件中  
FILE \*tempFile = tmpfile();  
if (!tempFile)  
\{  
return -1;  
\}  
while (!feof(file))  
\{  
char bufTemp\[500\] = \{0\};  
fgets(bufTemp,sizeof(bufTemp) - 1,file);  
if(!feof(file))  
\{  
// bufTemp\[strlen(bufTemp) - 1\] = '\\r';//去掉\\n  
// bufTemp\[strlen(bufTemp)\] = '\\n';  
\}  
else  
\{  
//最后一个字节读出来的是F F,下面的处理是去掉中间空格  
// bufTemp\[strlen(bufTemp) - 2\] = bufTemp\[strlen(bufTemp) - 1\];  
// bufTemp\[strlen(bufTemp) - 1\] = 0;  
\}  
  
  
fwrite(bufTemp,1,strlen(bufTemp),tempFile);  
\}  
  
  
fseek(file,iCount - (strlen(buf) + 1),SEEK\_SET);  
strcat(strAns,buf);  
//strcat(strReq,"\\\\r\\\\n");  
fwrite(strAns,1,strlen(strAns),file);   
fflush(file);  
iCount += 4;  
  
  
fseek(tempFile,0,SEEK\_SET);  
while (!feof(tempFile))  
\{  
char bufTemp\[500\] = \{0\};  
fgets(bufTemp,sizeof(bufTemp) - 1,tempFile);  
if(!feof(tempFile))  
\{  
// bufTemp\[strlen(bufTemp) - 1\] = '\\r';//去掉\\n  
// bufTemp\[strlen(bufTemp)\] = '\\n';  
\}  
else  
\{  
//最后一个字节读出来的是F F,下面的处理是去掉中间空格  
// bufTemp\[strlen(bufTemp) - 2\] = bufTemp\[strlen(bufTemp) - 1\];  
// bufTemp\[strlen(bufTemp) - 1\] = 0;  
\}  
  
  
fwrite(bufTemp,1,strlen(bufTemp),file);  
\}  
  
  
fclose(tempFile);  
fseek(file,iCount,SEEK\_SET);  
\}  
\}  
  
  
fclose(file);  
  
  
return 0;  
\}  
  
  
int fun2()  
\{  
//添加Req和Ans  
FILE \*file = fopen("E:/test.aut","r+");  
if (!file)  
\{  
return -1;  
\}   
  
  
int iCount = 0;  
bool iIsFirstReq = true;  
  
  
while(!feof(file))  
\{  
char buf\[500\] = \{0\};  
fgets(buf,sizeof(buf) - 1,file);  
  
  
if (0 == strlen(buf))  
\{  
fclose(file);  
return -1;  
\}  
else if (1 == strlen(buf))  
\{  
iCount += 2;  
continue;  
\}  
else if (2 < strlen(buf))  
\{  
iCount += strlen(buf) + 1;  
\}  
  
  
char strReq\[5\] = \{0\};  
memcpy(strReq,buf,4);  
if (!strcmp(strReq,"Req:"))  
\{  
if (iIsFirstReq)  
\{  
iIsFirstReq = false;  
continue;   
\}  
  
  
//先把插入位置后面的所有字符读取到临时文件中  
FILE \*tempFile = tmpfile();  
if (!tempFile)  
\{  
return -1;  
\}  
  
fwrite(buf,1,strlen(buf),tempFile);  
  
  
while (!feof(file))  
\{  
char bufTemp\[500\] = \{0\};  
fgets(bufTemp,sizeof(bufTemp) - 1,file);  
fwrite(bufTemp,1,strlen(bufTemp),tempFile);  
\}  
  
  
fseek(file,iCount - (strlen(buf) + 1),SEEK\_SET);  
//strcat(strReq,buf);  
//strcat(strReq,"\\\\r\\\\n");  
fwrite("\\n",1,1,file);   
fflush(file);  
iCount += 2;  
  
  
fseek(tempFile,0,SEEK\_SET);  
while (!feof(tempFile))  
\{  
char bufTemp\[500\] = \{0\};  
fgets(bufTemp,sizeof(bufTemp) - 1,tempFile);   
fwrite(bufTemp,1,strlen(bufTemp),file);  
\}  
  
  
fclose(tempFile);  
fseek(file,iCount,SEEK\_SET);  
\}   
\}  
  
  
fclose(file);  
  
  
return 0;  
\}  
  
  
int \_tmain(int argc, \_TCHAR\* argv\[\])  
\{

//在文件指定位置插入字符串或者空行，下面2个函数是在每行前面加上Req或者Ans，并添加空行间隔

fun1();

fun2();  
return 0;  
\}

txt文件内容如下：

/\*

87 82 83 FF 54 FF

87 83 82 FF 66 FF  
87 83 82 54 FF FF

87 82 83 48 FF FF

87 83 82 87 00 FF  
81 82 83 54 55 FF  
85 83 82 79 FF FF  
\*/