經常使用字符串處理函數

strcat - 字符串拼接函數

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結尾處 ( 覆蓋dest結尾處的'\0' )並添加'\0'。sourcestring和targetString所指內存區域不能夠重疊且targetString必須有足夠的空間來容納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數據寫入某個字符串中。 

#include<stdio.h>

//某個頭文件 intmain()/*主函數「整數」類型*/
{ 
　　charbuffer[50];　　　　　　　　　　　　　　　　　　　　/* 「字符」類型的數組，下面共有50個元素。*/
　　int n,a=5,b=3;　　　　　　　　　　　　　　　　　　　　 /* 三個變量都爲「整數」類型*/
　　n=sprintf(buffer,"%dplus%dis%d",a,b,a+b);     　　/* 賦予數值*/
　　printf("[%s]isastring%dcharslong\n",buffer,n);　　/* 「格式輸出」*/  
　　return0;　　　　　　　　　　　　　　　　　　　　　　　　/* 「返回零」 也就是程序正常退出*/
} 

輸出結果：

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

strcpy -- 字符串拷貝函數// ----------------------------------------------------------------------------------------------得到文件路徑
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--字符串拷貝函數

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重疊], the behavior is undefined. 【src和dest所指內存區域不能夠重疊且dest必須有足夠的空間來容納src的字符串】