[TOC] ## 實例 實例一: **賦值** ``` QString strOut; QTextStream streamOut(&strOut); //打印多種進制數字 streamOut<<800; ``` 實例二: 賦值給變量 ``` QString strIn = QObject::tr("800 abcd 123.789999"); QTextStream streamIn(&strIn); int numDec = 0; QString strSub; double dblReal = 0.0; //輸入到變量里 streamIn>>numDec>>strSub>>dblReal; ``` 實例三: 讀取文件 ``` QFile file("D:\\code\\hello_qt\\http\\mainwindow.cpp"); file.open(QIODevice::ReadOnly); QTextStream stream(&file); while (!stream.atEnd()) { qDebug()<<stream.readLine(); } ``` 實例四: ``` int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); QTextStream tsIn(stdin); //類似 cin QTextStream tsOut(stdout); //類似 cout while(true) { //顯示程序功能 QString strFuns = a.tr( "功能代碼：\n" "1. 輸入整型數\n" "2. 輸入浮點數\n" "3. 輸入單詞\n" "4. 輸入整行句子\n" "9. 退出程序\n" "請輸入功能代碼： " ); //顯示輸出時一定要帶上 <<flush 或者 <<endl tsOut<<strFuns<<flush; //獲取用戶輸入功能代碼 int nCode; tsIn>>nCode; if( 9 == nCode ) { tsOut<< a.tr("程序結束。")<<endl; //結束 return 0; } else { Funcs(nCode, tsIn, tsOut); } } return a.exec(); } ```