Merge pull request #8 from XuhuaHuang/Qt_console_app

Uploaded preliminary Qt console app with CMake

Author: XuhuaHuang

Qt/.gitignore

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+*_autogen/

Qt/Console/CMakelists.txt

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+# Qt itself requires at least CMake version 3.16
+# Qt version 5.14 is required for this project
+cmake_minimum_required(VERSION 3.20)
+
+# ┌──────────────────────────────────────────────────────────────────┐
+# │  Projects Settings                                               │
+# └──────────────────────────────────────────────────────────────────┘
+project(ConsoleApplication
+    VERSION 1.0.0
+    DESCRIPTION "Qt console application with CMake example"
+    LANGUAGES CXX
+)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# ┌──────────────────────────────────────────────────────────────────┐
+# │  Qt                                                              │
+# └──────────────────────────────────────────────────────────────────┘
+set(CMAKE_AUTOMOC ON)
+# set(CMAKE_AUTORCC ON)
+# set(CMAKE_AUTOUIC ON)
+
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+
+if(WIN32)
+    set(Qt5_DIR "C:/Qt/Qt5.14.0/5.14.0/msvc2017_64/lib/cmake/Qt5" CACHE PATH "directory where Qt5Config.cmake exists.")
+elseif(APPLE)
+    set(Qt5_DIR "/usr/local/Cellar/qt/5.14.0/clang_64/lib/cmake/Qt5/" CACHE PATH "directory where Qt5Config.cmake exists.")
+else()
+    set(Qt5_DIR "" CACHE PATH "directory where Qt5Config.cmake exists.")
+endif()
+
+find_package(Qt5 REQUIRED COMPONENTS Widgets)
+
+if(WIN32)
+    set(CMAKE_WIN32_EXECUTABLE ON)
+elseif(APPLE)
+    set(CMAKE_MACOSX_BUNDLE ON)
+endif()
+
+# ┌──────────────────────────────────────────────────────────────────┐
+# │  Executable                                                      │
+# └──────────────────────────────────────────────────────────────────┘
+# set(EXECUTABLE_OUTPUT_PATH "${PROJECT_SOURCE_DIR}/build")
+add_executable(ConsoleApplication
+    # "mainwindow.ui"
+    # "mainwindow.cpp"
+    "main.cpp"
+    "resources.qrc"
+)
+
+# Note that the application will still link against Qt5::Core
+# since Qt5::Widgets depends on it.
+target_link_libraries(ConsoleApplication PRIVATE Qt5::Core)
+
+set_target_properties(ConsoleApplication PROPERTIES
+    WIN32_EXECUTABLE ON
+    MACOSX_BUNDLE OFF
+)

Qt/Console/README.md

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+### Console
+
+This projects uses `Qt` 5.14 (`Qt5`) on Windows with `MSVC17` compiler.<br>
+
+#### A few things
+1. The default installation location of `Qt` is `C:\Qt\Qt5.14.0`.<br>
+2. Following the default installation option, make sure to add `C:\Qt\Qt5.14.0\5.14.0\msvc2017_64\bin` to the system `path` variable.<br>
+3. The `Qt5Config.cmake` file required by `CMakelists.txt` `find_package()` is located in `C:\Qt\Qt5.14.0\5.14.0\msvc2017_64\lib\cmake\Qt5`
+
+#### Build
+```shell
+# change to the directory where this file could be found
+mkdir build
+cd build
+cmake ..
+start ./ConsoleApplication.sln
+```
+
+#### References
+> https://github.com/ArthurSonzogni/cmake-Qt5-example<br>
+> https://github.com/miurahr/cmake-qt-packaging-example

Qt/Console/main.cpp

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+/*****************************************************************//**
+ * \file   main.cpp
+ * \brief  Qt console application with CMake example
+ * 
+ * \author Xuhua Huang
+ * \date   January 31, 2021
+ *********************************************************************/
+
+#include <iostream>
+
+#include <QTextStream>
+#include <QString>
+#include <QDebug>
+#include <QList>
+
+int main(void)
+{
+    // output with <iostream>
+    std::cout << "Hello Qt console" << "\n";
+
+    // QString, I/O stream
+    QTextStream out(stdout); // output stream object
+    QTextStream in(stdin); // input stream object
+
+    out << "This is a console application" << "\n";
+    out.flush();
+    out << "Please enter your name" << "\n";
+    out.flush();
+
+    // fixing the issue to enter full name with a space
+    std::string tempName; // temporary variable
+    std::getline(std::cin, tempName); // use getline() function with std::istream
+
+    // convert std::string to QString and print to console
+    // with static factory function fromStdString
+    QString Name = QString::fromStdString(tempName); // convert
+    out << "Hello " << Name << "!" << "\n"; // print
+    out.flush();
+
+    // use qDebug() to print to console
+    qDebug() << "Using qDebug() to send debugging messages to console in Desktop apps" << "\n";
+
+    // QString, append(), prepend()
+    QString a = "is";
+    a.append(" awesome");
+    a.prepend("Music ");
+
+    out << "Original mesasge: " << a << "\n";
+    out << "The a string has " << a.count()
+        << " characters" << "\n";
+
+    // toUpper() and toLower()
+    out << a.toUpper() << "\n";
+    out << a.toLower() << "\n";
+
+    // QList
+    QList<int> integerList;
+    QList<QString> stringList = QList<QString>() << "Canada" << "U.S.A" << "Mexico";
+    for (int i = 0; i < 6; i++)
+        integerList.append(i);
+    integerList.removeOne(4);
+
+    // output the integer integerList
+    foreach(int n, integerList)
+    {
+        qDebug() << n;
+    }
+
+    // output the string in stringList
+    foreach(QString str, stringList)
+    {
+        qDebug() << str;
+    }
+
+    return EXIT_SUCCESS;
+}

Qt/Console/resources.qrc

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+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+    <file>"./README.md"</file>
+</qresource>
+</RCC>