C++对带有分隔符的字符串 分割为数字的通用解决方案

需求：

数据库取出的字段类似于 "1,3,4"

然后用数字处理后,，比如 "1,2,3" 再存回去

#include<stdio.h>
#include<string.h>
 
class MyStr{
public:
    //根据 "1,2,3" 获得数字数组
    static int *split(char * str,const char *split,const int count){
        if(strlen(str)== || strlen(split)==)
            return NULL;
        if(count <=) return NULL;
        int * ints=new int[count];
        memset(ints,0x0,count*sizeof(int));
 
        char split_str[];
        int index_length=;
 
        snprintf(split_str,,"%%d%s",split);
        for (int i=;i<count;i++){
            sscanf(str+index_length,split_str,&ints[i]);
            char num_str[]={};
            sprintf(num_str,"%d",ints[i]);
            index_length+=strlen(num_str)+strlen(split);
        }
        return ints;
    }
    //根据数字数组 组合为字符串
    static char * bindNumbersToStr(int * nums,const unsigned int  nums_length,const char * split){
        char * str=new char[];
        char num_str[]={};
        int index_length=;
        for(int i=;i<nums_length;i++){
            sprintf(str+index_length,"%d%s",nums[i],split);
            index_length=strlen(str);
        }
        str[index_length-strlen(split)]=0x0;
        return str;
    }
};
 
int main(){
    char str[]="1,3,5,7,9";
    int * ints=MyStr::split(str,",",);
    for(int i=;i<;i++){
        printf("ints[%d]=%d\n",i,ints[i]);
    }
 
    char * s=MyStr::bindNumbersToStr(ints,,";");
    printf("s=%s\n",s);
    delete s;
    delete ints;
 
    return ;
}

运行结果：

ints[0]=1
ints[1]=3
ints[2]=5
ints[3]=7
ints[4]=9
s=1;3;5;7;9

如预期所料

当然还可以进一步完善。

百度下，别人的方案：

http://zhidao.baidu.com/question/348273815.html

http://hi.baidu.com/hwygy_001/item/a073ff0d3eb743e4fe240d3b

http://www.cnblogs.com/huashanlin/archive/2011/04/25/2028597.html