Prepare for version 1.0.

.gitignore

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+# Ignore compiled binaries
+/bin/
+/obj/

License.txt

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org>

Makefile

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+# This Makefile will build the MinGW Win32 MDI Example application
+
+# Object files to create for the executable
+OBJS = obj/WinMain.o obj/MainWindow.o obj/MDIChildWindow.o obj/AboutDialog.o obj/Resource.o
+
+# Warnings to be raised by the C compiler
+WARNS = -Wall
+
+# Names of tools to use when building
+CC = gcc
+RC = windres
+
+# Compiler flags. Compile ANSI build only if CHARSET=ANSI.
+ifeq (${CHARSET}, ANSI)
+  CFLAGS = -O2 -std=c99 -D _WIN32_IE=0x0500 -D WINVER=0x0500 ${WARNS} -Iinclude
+else
+  CFLAGS = -O2 -std=c99 -D UNICODE -D _UNICODE -D _WIN32_IE=0x0500 -D WINVER=0x0500 ${WARNS} -Iinclude
+endif
+
+# Linker flags
+LDFLAGS = -s -lcomctl32 -lcomdlg32 -Wl,--subsystem,windows
+
+.PHONY: all clean
+
+# Build executable by default
+all: bin/Win32MDIApp.exe
+
+# Delete all build output
+clean:
+	if exist bin\*  del /q bin\*
+	if exist obj\*  del /q obj\*
+
+# Create build output directories if they don't exist
+bin obj:
+	@if not exist "$@" mkdir "$@"
+
+# Compile object files for executable
+obj/%.o: src/%.c | obj
+	${CC} ${CFLAGS} -c "$<" -o "$@"
+
+# Build the resources
+obj/Resource.o: res/Resource.rc res/Application.manifest res/Application.ico include/Resource.h | obj
+	${RC} -I./include -I./res -i "$<" -o "$@"
+
+# Build the exectuable
+bin/Win32MDIApp.exe: ${OBJS} | bin
+	${CC} -o "$@" ${OBJS} ${LDFLAGS}
+
+# C header dependencies
+obj/AboutDialog.o:    include/AboutDialog.h include/Resource.h include/Globals.h
+obj/MainWindow.o:     include/MainWindow.h include/MDIChildWindow.h include/AboutDialog.h include/Resource.h include/Globals.h
+obj/MDIChildWindow.o: include/MDIChildWindow.h include/MainWindow.h include/Resource.h include/Globals.h
+obj/WinMain.o:        include/MainWindow.h include/MDIChildWindow.h include/Resource.h include/Globals.h

Readme.md

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+# MinGW Win32 MDI Application
+
+## Table of Contents
+
+- [Introduction](#introduction)
+- [Terms of Use](#terms-of-use)
+- [Problems?](#problems)
+- [Changelog](#changelog)
+
+## Introduction
+
+This application is an example Windows MDI GUI application, written to demonstrate how this can be done using MinGW. It
+accompanies the [Win32 Apps with MinGW](http://www.transmissionzero.co.uk/computing/win32-apps-with-mingw/) article on
+[Transmission Zero](http://www.transmissionzero.co.uk/). The compiled application is a fully functional, with the
+exception that opening and saving files does not read or write the files, and the MDI child windows do not have any code
+to display documents. However, by adding this functionality you can quickly create a functioning MDI application.
+
+To build the application on a Windows machine, open a command prompt, change to the directory containing the Makefile,
+and type "mingw32-make". The application should be compiled, linked, and output as "bin\Win32MDIApp.exe".
+
+To compile an ANSI build (i.e. if you want the application to run under Windows 9x), run "mingw32-make CHARSET=ANSI"
+from the command prompt.
+
+To build under another operating system, the Makefile will probably require some small changes. For example, under
+Fedora the C compiler and resource compiler are named "i686-pc-mingw32-gcc" and "i686-pc-mingw32-windres". Also, your
+version of the make utility may be named differently--please check the documentation which came with your MinGW
+packages.
+
+It should also be possible to build the application using any C or C++ compiler which supports targeting Windows, for
+example Open Watcom. You will of course need to set the projects up for yourself if you do that. It can also be built
+with Visual C++, however you are advised to use the
+[MSVC Win32 MDI Application](https://github.com/TransmissionZero/MSVC-Win32-MDI-Application) because that's ready to use
+with MSVC. No source code modifications are required if you want to build a 64 bit version of the application.
+
+## Terms of Use
+
+Refer to "License.txt" for terms of use.
+
+## Problems?
+
+If you have any problems or questions, please ensure you have read this readme file and the
+[Win32 Apps with MinGW](http://www.transmissionzero.co.uk/computing/win32-apps-with-mingw/) article. If you are still
+having trouble, you can [get in contact](http://www.transmissionzero.co.uk/contact/).
+
+## Changelog
+
+1. 2017-08-14: Version 1.0
+  - Initial release.
+
+Transmission Zero
+2017-08-14

include/AboutDialog.h

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+#ifndef ABOUTDIALOG_H
+#define ABOUTDIALOG_H
+
+#include <windows.h>
+
+/* Dialog procedure for our "about" dialog */
+INT_PTR CALLBACK AboutDialogProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam);
+
+/* Show our "about" dialog */
+void ShowAboutDialog(HWND owner);
+
+#endif

include/Globals.h

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+#ifndef GLOBALS_H
+#define GLOBALS_H
+
+#include <windows.h>
+
+/* Global instance handle */
+extern HINSTANCE g_hInstance;
+
+/* Global main window handle */
+extern HWND g_hMainWindow;
+
+/* Global MDI client window handle */
+extern HWND g_hMDIClient;
+
+#endif

include/MDIChildWindow.h

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+#ifndef MDICHILDWINDOW_H
+#define MDICHILDWINDOW_H
+
+#include <windows.h>
+
+/* Window procedure for our main window */
+LRESULT CALLBACK MDIChildWndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
+
+/* Register a class for our main window */
+BOOL RegisterMDIChildWindowClass(void);
+
+/* Create a new MDI child window */
+void MDIChildNew(HWND hMDIClient);
+
+/* Open a document in a new MDI child window */
+void MDIChildOpen(HWND hMDIClient);
+
+/* Save a document in an MDI child window */
+void MDIChildSave(HWND hMDIChild);
+
+/* Save a document in an MDI child window with a filename */
+void MDIChildSaveAS(HWND hMDIChild);
+
+/* Instance data for the MDI child window */
+typedef struct tagMdiChildData
+{
+  /* Flag to determine whether this is a new document which hasn't been saved */
+  BOOL IsUnSaved;
+} MdiChildData;
+
+#endif

include/MainWindow.h

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+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <windows.h>
+
+/* Window procedure for our main window */
+LRESULT CALLBACK MainWndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
+
+/* Register a class for our main window */
+BOOL RegisterMainWindowClass(void);
+
+/* Create an instance of our main window */
+HWND CreateMainWindow(void);
+
+/* Callback to close all child windows */
+BOOL CALLBACK CloseAllProc(HWND hWnd, LPARAM lParam);
+
+/* First ID Windows should use for menu items it attaches to the "Window" menu */
+#define ID_MDI_FIRSTCHILD 50000
+
+#endif

include/Resource.h

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+#ifndef RESOURCE_H
+#define RESOURCE_H
+
+#define IDI_APPICON                    101
+#define IDR_MAINMENU                   102
+#define IDR_ACCELERATOR                103
+#define IDD_ABOUTDIALOG                104
+#define ID_FILE_NEW                    40001
+#define ID_FILE_OPEN                   40002
+#define ID_FILE_SAVE                   40003
+#define ID_FILE_SAVEAS                 40004
+#define ID_FILE_CLOSE                  40005
+#define ID_FILE_CLOSEALL               40006
+#define ID_FILE_EXIT                   40007
+#define ID_WINDOW_TILE                 40008
+#define ID_WINDOW_CASCADE              40009
+#define ID_WINDOW_ARRANGE              40010
+#define ID_HELP_ABOUT                  40011
+#define ID_MDI_FIRSTCHILD              50000
+
+#ifndef IDC_STATIC
+  #define IDC_STATIC                   -1
+#endif
+
+#endif

res/Application.manifest

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- Supports Windows Vista / Server 2008 -->
+      <supportedOS Id="{e2011457-1546-43c5-a5fe-008deee3d3f0}"/>
+      <!-- Supports Windows 7 / Server 2008 R2 -->
+      <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/>
+      <!-- Supports Windows 8 / Server 2012 -->
+      <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/>
+      <!-- Supports Windows 8.1 / Server 2012 R2 -->
+      <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/>
+      <!-- Supports Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
+    </application>
+  </compatibility>
+  <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
+    <security>
+      <requestedPrivileges>
+        <requestedExecutionLevel level="asInvoker" uiAccess="false"/>
+      </requestedPrivileges>
+    </security>
+  </trustInfo>
+  <dependency>
+    <dependentAssembly>
+      <assemblyIdentity type="Win32" name="Microsoft.Windows.Common-Controls" version="6.0.0.0" processorArchitecture="*" publicKeyToken="6595b64144ccf1df" language="*"/>
+    </dependentAssembly>
+  </dependency>
+</assembly>

res/Resource.rc

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+#include <windows.h>
+#include "Resource.h"
+
+/* Win32 application icon */
+IDI_APPICON ICON                       "Application.ico"
+
+/* Our main menu */
+IDR_MAINMENU MENU
+BEGIN
+  POPUP "&File"
+  BEGIN
+    MENUITEM "&New\tCtrl+N",           ID_FILE_NEW
+    MENUITEM "&Open...\tCtrl+O",       ID_FILE_OPEN
+    MENUITEM "&Save\tCtrl+S",          ID_FILE_SAVE, GRAYED
+    MENUITEM "&Save As...",            ID_FILE_SAVEAS, GRAYED
+    MENUITEM SEPARATOR
+    MENUITEM "&Close\tCtrl+F4",        ID_FILE_CLOSE, GRAYED
+    MENUITEM "&Close All",             ID_FILE_CLOSEALL, GRAYED
+    MENUITEM SEPARATOR
+    MENUITEM "E&xit",                  ID_FILE_EXIT
+  END
+  POPUP "&Window" GRAYED
+  BEGIN
+    MENUITEM "&Tile\tShift+F5",        ID_WINDOW_TILE
+    MENUITEM "&Cascade\tShift+F4",     ID_WINDOW_CASCADE
+    MENUITEM "Arrange &Icons",         ID_WINDOW_ARRANGE
+  END
+  POPUP "&Help"
+  BEGIN
+    MENUITEM "&About",                 ID_HELP_ABOUT
+  END
+END
+
+/* Application manifest */
+CREATEPROCESS_MANIFEST_RESOURCE_ID RT_MANIFEST "Application.manifest"
+
+/* Executable version information */
+VS_VERSION_INFO    VERSIONINFO
+FILEVERSION        1,0,0,0
+PRODUCTVERSION     1,0,0,0
+FILEFLAGSMASK      VS_FFI_FILEFLAGSMASK
+#ifdef _DEBUG
+  FILEFLAGS        VS_FF_DEBUG | VS_FF_PRERELEASE
+#else
+  FILEFLAGS        0
+#endif
+FILEOS             VOS_NT_WINDOWS32
+FILETYPE           VFT_APP
+FILESUBTYPE        VFT2_UNKNOWN
+BEGIN
+  BLOCK "StringFileInfo"
+  BEGIN
+    BLOCK "080904b0"
+    BEGIN
+      VALUE "CompanyName", "Transmission Zero"
+      VALUE "FileDescription", "Win32 MDI Example application"
+      VALUE "FileVersion", "1.0.0.0"
+      VALUE "InternalName", "Win32MDIApp"
+      VALUE "LegalCopyright", "�2017 Transmission Zero"
+      VALUE "OriginalFilename", "Win32MDIApp.exe"
+      VALUE "ProductName", "Win32 MDI Example application"
+      VALUE "ProductVersion", "1.0.0.0"
+    END
+  END
+  BLOCK "VarFileInfo"
+  BEGIN
+    VALUE "Translation", 0x809, 1200
+  END
+END
+
+/* Our "about" dialog */
+IDD_ABOUTDIALOG DIALOGEX 0, 0, 147, 67
+STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | WS_POPUP | WS_CAPTION | WS_SYSMENU
+CAPTION "About"
+FONT 8, "MS Shell Dlg", 400, 0, 0x1
+BEGIN
+  ICON             IDI_APPICON,IDC_STATIC,7,7,20,20
+  LTEXT            "Win32 MDI Example application.",IDC_STATIC,34,7,98,8
+  LTEXT            "�2017 Transmission Zero",IDC_STATIC,34,17,86,8
+  DEFPUSHBUTTON    "OK",IDOK,90,46,50,14,WS_GROUP
+END
+
+/* Our accelerators */
+IDR_ACCELERATOR ACCELERATORS
+BEGIN
+  "A",             ID_HELP_ABOUT,      VIRTKEY, ALT, NOINVERT
+  "N",             ID_FILE_NEW,        VIRTKEY, CONTROL, NOINVERT
+  "O",             ID_FILE_OPEN,       VIRTKEY, CONTROL, NOINVERT
+  "S",             ID_FILE_SAVE,       VIRTKEY, CONTROL, NOINVERT
+  VK_F4,           ID_WINDOW_CASCADE,  VIRTKEY, SHIFT, NOINVERT
+  VK_F5,           ID_WINDOW_TILE,     VIRTKEY, SHIFT, NOINVERT
+END