First, working version version

bluedentist.sln

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bluedentist.vcxproj

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bluedentist.vcxproj.filters

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+<?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;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;hm;inl;inc;xsd</Extensions>
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+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
+    </Filter>
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+      <Filter>Header Files</Filter>
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+    <ClInclude Include="include\resource.h">
+      <Filter>Header Files</Filter>
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+    <ClInclude Include="include\main.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
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+      <Filter>Resource Files</Filter>
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+</Project>

include/LenovoApi.h

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+#pragma once
+#include "Windows.h"
+
+typedef int(__fastcall *SetBluetooth)(int, int);
+typedef int(__fastcall *GetBluetoothStatus)(int*, int);
+
+class LenovoApi {
+public:
+	LenovoApi();
+	~LenovoApi();
+
+	SetBluetooth setBluetooth;
+	GetBluetoothStatus getBluetoothStatus;
+private:
+	HINSTANCE apiLibrary;
+};
+

include/main.h

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+#pragma once
+#include <windows.h>
+#include "resource.h"
+#include "LenovoApi.h"
+
+int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow);
+BOOL CALLBACK MyDialog(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam);
+void checkBluetoothStatus(HWND hDlg);

src/LenovoApi.cpp

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+#include "LenovoApi.h"
+
+LenovoApi::LenovoApi() {
+	char libraryDir[1024];
+	DWORD bufferSize = 1024;
+	HKEY key;
+
+	RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Lenovo\\Energy Management", 0, KEY_READ + KEY_WOW64_64KEY, &key);
+
+	if (key) {
+		RegQueryValueExA(key, "InstallDir", NULL, NULL, (LPBYTE)libraryDir, &bufferSize);
+		RegCloseKey(key);
+
+		strcpy_s(libraryDir + bufferSize - 1, 24, "\LenovoEmExpandedAPI.dll");
+
+		this->apiLibrary = LoadLibraryA(libraryDir);
+
+		if (this->apiLibrary) {
+			this->setBluetooth = (SetBluetooth)GetProcAddress(this->apiLibrary, "SetBluetooth");
+			this->getBluetoothStatus = (GetBluetoothStatus)GetProcAddress(this->apiLibrary, "GetBluetoothStatus");
+		} else {
+			#ifdef _M_IX86
+			throw "Could not load library. Try using x64 version of Bluedentist.";
+			#endif
+
+			#ifdef _M_X64
+			throw "Could not load library. Try using x86 version of Bluedentist.";
+			#endif
+		}
+	} else {
+		throw "Could not find installation directory of Lenovo Energy Management.";
+	}
+
+}
+
+
+LenovoApi::~LenovoApi() {
+	FreeLibrary(this->apiLibrary);
+}

src/main.cpp

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+#include "main.h"
+
+LenovoApi *lenovoApi;
+
+int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
+	try {
+		lenovoApi = new LenovoApi();
+
+		HWND hWnd = CreateDialog(hInstance, MAKEINTRESOURCE(IDD_DIALOG1), NULL, (DLGPROC)MyDialog);
+
+		ShowWindow(hWnd, nCmdShow);
+		UpdateWindow(hWnd);
+
+		MSG msg;
+		while (GetMessage(&msg, NULL, 0, 0)) {
+			TranslateMessage(&msg);
+			DispatchMessage(&msg);
+		}
+
+		return (int)msg.wParam;
+	} catch (const char* exception) {
+		MessageBoxA(NULL, exception, "Error", MB_OK + MB_ICONERROR);
+	}
+}
+
+BOOL CALLBACK MyDialog(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam) {
+	switch (message) {
+	case WM_CLOSE:
+		DestroyWindow(hDlg);
+		return TRUE;
+	case WM_DESTROY:
+		PostQuitMessage(0);
+		return TRUE;
+	case WM_INITDIALOG:
+		checkBluetoothStatus(hDlg);
+		return TRUE;
+	case WM_COMMAND:
+		if (LOWORD(wParam) == IDC_RADIO1) {
+			lenovoApi->setBluetooth(1, 0);
+			checkBluetoothStatus(hDlg);
+		}
+		if (LOWORD(wParam) == IDC_RADIO2) {
+			lenovoApi->setBluetooth(0, 0);
+			checkBluetoothStatus(hDlg);
+		}
+
+		return TRUE;
+	}
+
+	return FALSE;
+}
+
+void checkBluetoothStatus(HWND hDlg) {
+	int bluetoothStatus;
+	lenovoApi->getBluetoothStatus(&bluetoothStatus, 0);
+
+	if (bluetoothStatus) {
+		CheckDlgButton(hDlg, IDC_RADIO1, BST_CHECKED);
+	} else {
+		CheckDlgButton(hDlg, IDC_RADIO2, BST_CHECKED);
+	}
+}