Question

对于作业，我必须从包含目录列表的文本文件中删除一行。用户输入文件名，必须删除包含文件名的目录。对于赋值，我必须使用char数组。我有一个问题，strcmp返回-13时它应该返回0，但这只发生在应该删除的那一行之后的另一行。这里有相关代码：

void deleteSong()
{
    char userSongName[ENTRY_SZ], objectSongName[ENTRY_SZ];
    cout << "Enter the name of a song you want to delete.\n";
    cin.getline(userSongName, ENTRY_SZ);
    Node* tempNode = musicList.GetFirstNode();
    for (int n = 0; n < musicList.GetListLength(); n++)
    {
        strncpy(objectSongName, static_cast<Song*>(tempNode->data_)->GetSongName(), ENTRY_SZ);
        cout << strcmp(userSongName, objectSongName) << endl;
        if (!strcmp(userSongName, objectSongName))
        {
            ifstream songFileDir;
            ofstream tempFileDir;
            songFileDir.open(Song::songListFile_);
            tempFileDir.open("temp.txt");
            while (songFileDir.getline(userSongName, ENTRY_SZ))
            {
                if (!userSongName[0] == '\0')
                {
                    if (strcmp(strrchr(userSongName, '\\') + 1, objectSongName))
                    {
                        tempFileDir << userSongName << endl;
                    }
                }
            }
            songFileDir.close();
            songFileDir.clear(ios_base::goodbit);
            tempFileDir.close();
            tempFileDir.clear(ios_base::goodbit);
            remove(Song::songListFile_);
            rename("temp.txt", Song::songListFile_);
            musicList.RemoveThisLink(tempNode); //This calls a function that removes the node from the linked list.
            delete tempNode;
            return;
        }
        tempNode = tempNode->next_;
    }
    cout << "Song was not found.\n";
    return;
}

Answer 1

它返回-13

13是回车的ascii。看来第二个参数最后包含一个额外的CR。

解决方案
Trim字符串删除（或用'\0'替换字符）所有尾随空格（＆＃34; ctype.h＆＃34; ，isspace）参数字符串的字符。

Strcmp用户输入和文件输入不匹配

1 个答案: