問題描述：我們的系統通過Socket網路通訊往linux伺服器上傳送資料，伺服器上接收的資料格式是以逗號隔開的字串。我們需要將這個字串按逗號作為分隔符來擷取。

解決方法：使用C語言中的strtok()函式實現

程式碼實現（下面程式碼的功能是將字串"now , is the time for all , good men to come to the , aid of their country"以逗號作為分隔符來擷取，並將截取出的字串打印出來）：

#include <stdio.h>
#include <string.h>

int main()
{
    char str[] = "now , is the time for all , good men to come to the , aid of their country";
    char delims[] = ",";
    char *result = NULL;
    result = strtok( str, delims );
    while( result != NULL ) {
    printf( "result is \"%s\"\n", result );
    result = strtok( NULL, delims );
    }
}
 

進一步：封裝成實現按分隔符擷取字串的函式

#include <stdio.h>  
#include <string.h>  
void split(char str[],char delims[])
{
    char *result = NULL; 
    result = strtok( str, delims );  
    while( result != NULL ) {  
    printf( "result is \"%s\"\n", result );  
    result = strtok( NULL, delims );  
    }  
}
int main()  
{  
    char str[] = "now , is the time for all , good men to come to the , aid of their country";  
    char delims[] = ",";  
	split(str,delims);
}