c++ - 用指针搜索和替换

Question

我正在尝试实现“搜索并替换所有”。我有 2 个指针来监视字符 nclude ＃包括 ＃包括 使用命名空间标准；

const int BUFSIZE = 256;

const char * const SEARCH = "the";
const char * const REPLACE = "Who is John";

int main()
{
    char buf[BUFSIZE];
      Error(SOURCE_FILE);

    //open file for append and update
    fstream destination(DESTINATION_FILE, 
        ios_base::in | ios_base::out | ios_base::app);

    //check if destination file is open
    if (!destination.is_open())
        Error(SOURCE_FILE);


        bufPtr += length;               //move bufPtr to point past the SEARCH

        destination << bufPtr;          //write rest of buf to destination
        //destination.seekg(0);

        //write lines from source to destination
        //if(!(destination << buf << '\n'))
            //Error(SOURCE_FILE);
    }   
    source.close();
    destination.close();

    return 0;
}

Answer 1

您没有检查 strstr() 找不到搜索字符串的情况。在那种情况下它返回 NULL，而你的 while 循环在那种情况下不会做正确的事情。