经常使用字符串处理函数

strcat - 字符串拼接函数

char *strcat (char targetString[], const char string_toAppend[]);

Purpose

Appends [ə'pend附加] a copy of a source string to the end of a target string, including the terminating ASCII NUL byte. The initial [ɪ'nɪʃəl最初的]character of the string to append[ə'pend附加] overwrites the NUL[空字符] byte[] at the end of the target string. If copying takes place between objects that overlap, the behavior is undefined.

把sourcestring所指字符串添加到targetString结尾处 ( 覆盖dest结尾处的'\0' )并添加'\0'。sourcestring和targetString所指内存区域不能够重叠且targetString必须有足够的空间来容纳sourcestring的字符串。

sprintf -- 字符串格式化命令

int sprintf (char targetString[], const char formatString[], ...);

Purpose

Writes output to the specified string according to format specifiers in formatString. A null character is written at the end of the characters written.

主要功能是把格式化的数据写入某个字符串中。 

#include<stdio.h>

//某个头文件 intmain()/*主函数“整数”类型*/
{ 
　　charbuffer[50];　　　　　　　　　　　　　　　　　　　　/* “字符”类型的数组，下面共有50个元素。*/
　　int n,a=5,b=3;　　　　　　　　　　　　　　　　　　　　 /* 三个变量都为“整数”类型*/
　　n=sprintf(buffer,"%dplus%dis%d",a,b,a+b);     　　/* 赋予数值*/
　　printf("[%s]isastring%dcharslong\n",buffer,n);　　/* “格式输出”*/  
　　return0;　　　　　　　　　　　　　　　　　　　　　　　　/* “返回零” 也就是程序正常退出*/
} 

输出结果：

[5 plus 3 is 8]     is a string 13 chars long

strcpy -- 字符串拷贝函数// ----------------------------------------------------------------------------------------------得到文件路径
int GetIniFilePath(char*filename,char*filepath,char *errmsg)
{
    char CurrentFilePath [1024]    ={"\0"};
    char FilePathConfFile [1024]={"\0"};
    if(GetDir (CurrentFilePath)<0)
    {
       return -1;
    }
    strcat(CurrentFilePath,"\\Config");
    sprintf (FilePathConfFile, "%s\\%s.ini", CurrentFilePath,filename);
    strcpy(filepath,FilePathConfFile);

    return 0;    
}

strcpy--字符串拷贝函数

char *strcpy (char targetString[], const char sourceString[]);

Purpose

Copies a source string including the terminating ASCII NUL byte into a target string. If copying takes place between objects that overlap[əʊvə'læp重叠], the behavior is undefined. 【src和dest所指内存区域不能够重叠且dest必须有足够的空间来容纳src的字符串】