Created dll project, already including basic AHK interface functionality

OSC2AHK.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31112.23
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "OSC2AHK", "OSC2AHK\OSC2AHK.vcxproj", "{637B560B-0B6A-4EF8-B45B-61459545F6A3}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{637B560B-0B6A-4EF8-B45B-61459545F6A3}.Debug|x64.ActiveCfg = Debug|x64
+		{637B560B-0B6A-4EF8-B45B-61459545F6A3}.Debug|x64.Build.0 = Debug|x64
+		{637B560B-0B6A-4EF8-B45B-61459545F6A3}.Debug|x86.ActiveCfg = Debug|Win32
+		{637B560B-0B6A-4EF8-B45B-61459545F6A3}.Debug|x86.Build.0 = Debug|Win32
+		{637B560B-0B6A-4EF8-B45B-61459545F6A3}.Release|x64.ActiveCfg = Release|x64
+		{637B560B-0B6A-4EF8-B45B-61459545F6A3}.Release|x64.Build.0 = Release|x64
+		{637B560B-0B6A-4EF8-B45B-61459545F6A3}.Release|x86.ActiveCfg = Release|Win32
+		{637B560B-0B6A-4EF8-B45B-61459545F6A3}.Release|x86.Build.0 = Release|Win32
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {C78C981F-16A4-4CF8-9342-48C28379B77C}
+	EndGlobalSection
+EndGlobal

OSC2AHK/OSC2AHK.vcxproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <VCProjectVersion>16.0</VCProjectVersion>
+    <Keyword>Win32Proj</Keyword>
+    <ProjectGuid>{637b560b-0b6a-4ef8-b45b-61459545f6a3}</ProjectGuid>
+    <RootNamespace>OSC2AHK</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
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+    <CharacterSet>Unicode</CharacterSet>
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+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
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+    <CharacterSet>Unicode</CharacterSet>
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+    <CharacterSet>Unicode</CharacterSet>
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+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
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+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <LinkIncremental>true</LinkIncremental>
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+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
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+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
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+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <LinkIncremental>false</LinkIncremental>
+  </PropertyGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>WIN32;_DEBUG;OSC2AHK_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableUAC>false</EnableUAC>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
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+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>WIN32;NDEBUG;OSC2AHK_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableUAC>false</EnableUAC>
+    </Link>
+  </ItemDefinitionGroup>
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+    <ClCompile>
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+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>_DEBUG;OSC2AHK_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableUAC>false</EnableUAC>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>NDEBUG;OSC2AHK_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+    </ClCompile>
+    <Link>
+      <SubSystem>Windows</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <EnableUAC>false</EnableUAC>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClInclude Include="dllmain.h" />
+    <ClInclude Include="framework.h" />
+    <ClInclude Include="pch.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="dllmain.cpp" />
+    <ClCompile Include="pch.cpp">
+      <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">Create</PrecompiledHeader>
+      <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">Create</PrecompiledHeader>
+      <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">Create</PrecompiledHeader>
+      <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Release|x64'">Create</PrecompiledHeader>
+    </ClCompile>
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>

OSC2AHK/OSC2AHK.vcxproj.filters

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;c++;cppm;ixx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hh;hpp;hxx;h++;hm;inl;inc;ipp;xsd</Extensions>
+    </Filter>
+    <Filter Include="Resource Files">
+      <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="framework.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="pch.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="dllmain.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="dllmain.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="pch.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+</Project>

OSC2AHK/dllmain.cpp

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+// dllmain.cpp : Defines the entry point for the DLL application.
+#include "pch.h"
+#include "dllmain.h"
+#include <string>
+#include <vector>
+
+/* Definition and declaration of the OSC Listeners. 
+* Contains OSC addresses to listen to and OS message ID to send for each 
+* address */
+struct Listener {
+    std::string address;
+    unsigned int message;
+};
+std::vector<Listener> listeners;
+/* Handle to the calling window */
+HWND hwnd = NULL;
+
+BOOL APIENTRY DllMain( HMODULE hModule,
+                       DWORD  ul_reason_for_call,
+                       LPVOID lpReserved
+                     )
+{
+    switch (ul_reason_for_call)
+    {
+    case DLL_PROCESS_ATTACH:
+    case DLL_THREAD_ATTACH:
+        break;
+    case DLL_THREAD_DETACH:
+    case DLL_PROCESS_DETACH:
+        close();
+        break;
+    }
+    return TRUE;
+}
+
+DLLEXPORT int open(HWND targetWindowHandle, unsigned int port)
+{
+    hwnd = targetWindowHandle;
+    return 0;
+}
+
+DLLEXPORT int close()
+{
+    hwnd = NULL;
+    listeners.clear();
+    return 0;
+}
+
+DLLEXPORT int addListener(std::string address, unsigned int messageID)
+{
+    listeners.push_back(Listener{ address, messageID });
+    return 0;
+}
+
+DLLEXPORT int removeListener(std::string address)
+{
+    UINT result = 1;
+
+    //All OSC addresses have to start with a '/'
+    if (address[0] != '/') address.insert(0, "/");
+
+    for (UINT i = 0; i < listeners.size(); i++)
+    {
+        if (listeners[i].address == address)
+        {
+            listeners.erase(listeners.begin() + i);
+            i--; //one step backward, what previously was i+1 is i after erase().
+            result = 0; //Found at least one occurence
+        }
+    }
+    return result;
+}
+
+/* Debugging function to test messaging. Probably will be removed later. */
+DLLEXPORT int testMsg(HWND windowHandle, unsigned int messageID)
+{
+    if (PostMessage(windowHandle, messageID, 42, 43))
+        return 0;
+    else
+        return 1;
+}

OSC2AHK/dllmain.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <windows.h>
+#include <string>
+
+#define DLLEXPORT __declspec(dllexport)
+
+extern "C" DLLEXPORT int open(HWND targetWindowHandle, unsigned int port);
+extern "C" DLLEXPORT int close();
+extern "C" DLLEXPORT int addListener(std::string address, unsigned int messageID);
+extern "C" DLLEXPORT int removeListener(std::string address);
+extern "C" DLLEXPORT int testMsg(HWND windowHandle, unsigned int messageID);

OSC2AHK/framework.h

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+#pragma once
+
+#define WIN32_LEAN_AND_MEAN             // Exclude rarely-used stuff from Windows headers
+// Windows Header Files
+#include <windows.h>

OSC2AHK/pch.cpp

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+// pch.cpp: source file corresponding to the pre-compiled header
+
+#include "pch.h"
+
+// When you are using pre-compiled headers, this source file is necessary for compilation to succeed.

OSC2AHK/pch.h

@@ -0,0 +1,13 @@
+// pch.h: This is a precompiled header file.
+// Files listed below are compiled only once, improving build performance for future builds.
+// This also affects IntelliSense performance, including code completion and many code browsing features.
+// However, files listed here are ALL re-compiled if any one of them is updated between builds.
+// Do not add files here that you will be updating frequently as this negates the performance advantage.
+
+#ifndef PCH_H
+#define PCH_H
+
+// add headers that you want to pre-compile here
+#include "framework.h"
+
+#endif //PCH_H

msgtest.ahk

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+#SingleInstance, Force
+SendMode Input
+SetWorkingDir, %A_ScriptDir%
+hWnd := WinExist()
+
+stdout := FileOpen("tmp.log", "w")
+stdout.WriteLine("START")
+
+retOnMsg := OnMessage(0x1000, "msghandler")
+stdout.WriteLine("OnMessage:")
+stdout.WriteLine(retOnMsg)
+OnExit("exithandler")
+
+hModule := DllCall("LoadLibrary", "Str", "x64\Debug\OSC2AHK.dll", "Ptr")  ; Avoids the need for DllCall() in the loop to load the library.
+stdout.WriteLine("DLL handle:")
+stdout.WriteLine(hModule)
+
+ret := DllCall("OSC2AHK.dll\testMsg", UInt,hWnd, UInt,0x1000)
+stdout.WriteLine("DLL call:")
+stdout.WriteLine(ret)
+
+stdout.Close()
+
+return
+
+msghandler(wParam, lParam, msg, hwnd) {
+    stdout := FileOpen("tmp.log", "a")
+    stdout.WriteLine("Received MSG!")
+    stdout.WriteLine(wParam)
+    stdout.WriteLine(lParam)
+    stdout.Close()
+}
+
+exithandler() {
+    stdout := FileOpen("tmp.log", "a")
+    stdout.WriteLine("The End")
+    stdout.Close()
+}
+
+do_exit:
+ExitApp
+return ; unnecessary redundancy?
+
+Esc::GoSub, do_exit