Controlling via stdin/out

.gitignore

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+*.obj
+*.*proj.user
+*.pdb
+/Debug/
+/Release/

README.md

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+# Task tray button
+
+Displays a button on the task tray, by shrinking the window list and positioning itself between that and the
+notification area.
+
+The taskbar is a window, having child windows like this: 
+
+    [start][search][windows                 ][icons|clock]
+
+
+The tray button is just another child window, inserted between the window list and icons:
+
+    [start][search][windows         ][button][icons|clock]
+
+
+This was extracted from the original Morphic application, [gpii-app/trayButton](https://github.com/GPII/gpii-app/tree/master/trayButton).
+
+## Build
+
+Run `build.ps1`, or use Visual Studio.
+
+## Operation
+
+### Control
+
+It is controlled by the parent process via standard input, with the following commands:
+
+Set the icon to `file`:
+
+    ICON file
+
+Set the high-contrast icon to `file`:
+
+    ICON_HC file
+
+Set the tooltip `text`:
+
+    TOOLTIP text
+
+Specify a window handle `hwnd` belonging to the parent process, to focus when the button is clicked:
+
+    HWND hwnd
+
+Set the checked state to `bool`:
+
+    STATE bool
+
+Remove the icon, re-adjust the taskbar, and end the process:
+
+    DESTROY
+
+### Events
+
+The tray-button process will produce the following notifications on its standard output:
+
+* `CLICK`: The left button is clicked.
+* `SHOWMENU`: The right button is clicked.
+* `MOUSEENTER`, `MOUSELEAVE`: The mouse cursor has entered or left the button.
+* `POSITION MAKELONG(x,y) MAKELONG(w,h): Position of the button has changed.
+* `UPDATE`: Configuration is required.

build.cmd

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+powershell -ExecutionPolicy ByPass "%~dp0\build.ps1"

build.ps1

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+Function Get-MSBuild {
+    Param (
+        [Parameter(Mandatory=$true)]
+        [string] $version
+    )
+
+    # TODO: Check version validity.
+    # Valid versions are [2.0, 3.5, 4.0]
+
+    $dotNetVersion = $version
+    $regKey = "HKLM:\software\Microsoft\MSBuild\ToolsVersions\$dotNetVersion"
+    $regProperty = "MSBuildToolsPath"
+
+    $msbuild = Join-Path -path (Get-ItemPropertyweb.tw $regKey).$regProperty -childpath "msbuild.exe"
+
+    return $msbuild
+}
+
+
+$msbuild = Get-MSBuild "4.0"
+Start-Process -FilePath $msbuild -ArgumentList "tray-button.vcxproj /p:Configuration=Release" -PassThru -NoNewWindow