By codemonkey_uk in codemonkey_uk's Diary

　　基本解釋

區域設置和忽略大小寫的字串比較

   Starting interactive processes with QProcess

I've been playing with QProcess quite a bit lately, which is a wonderful class. However, I noticed that I cannot start an interactive process with it (i.e. a process that gets stdin from the terminal). This is because QProcess redirects stdin for all processes it starts back to the parent process, so that the programmer can send data to the process using write(). Thing is, I don't want this. So, after talking a bit with Andreas (who wrote QProcess), we came up with the following trick:

class InteractiveProcess : public QProcess
{
    static int stdinClone;
public:
    InteractiveProcess(QObject *parent = 0)
        : QProcess(parent)
    {
        if (stdinClone == -1)
            stdinClone = ::dup(fileno(stdin));
    }
protected:
    void setupChildProcess()
    {
        ::dup2(stdinClone, fileno(stdin));
    }
};
 
int InteractiveProcess::stdinClone = -1;

通過mismatch或lexicographical比較

實作簡單的忽略大小寫字串比較

一個STL菜鳥最常問的問題是「我怎麼使用STL來進行忽略大小寫的字符串比較？」這是一個令人迷惑的簡單問題。忽略大小寫字串比較要麼真的簡單 要麼真的困難，依賴於你要多一般地解決這個問題。如果你忽略國際化問題而且只關注於設計成字串strcmp那樣的類型，這個任務很簡單。如果你要有 strcmp不具有的按語言處理字串中的字元的能力（也就是，容納文字的字串是除了英語以外的語言 ）或程序使用了區域設置而不是預設這個任務很困 難。

（這個問題一個比較難的版本也能用STL解決。另文說明 ）為了讓簡單的問題變得更有挑戰性，我會處理兩次。想要使用忽略大小寫比較的程式設計師通常需要兩種不同的呼叫介面，一種類似 strcmp（返回一個負數、零或正數），另一種類似operator（返回true或 false）。因此我會展示怎麼使用STL算法實現兩種呼叫介面。

C++

Converting a String to Upper Case

C++語言相關探討，細究指標(pointer)與參照(reference)

The Mac OS, STL, & Iterators

by Duane Murphy, Bear River Associates, Inc.

Take advantage of the C++ Standard Library Algorithms with the Mac Toolbox

There are many parts of the Mac OS Toolbox that require you to search for what you need. Search for files with a certain type code. Search for a process with a particular creator code. Search for mounted volumes that are removable. The list of managers in the Mac OS that require searching goes on and on. So, we write search and loop routines to do the work.