Initial version

PortionOfScreen.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.2.32516.85
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "PortionOfScreen", "PortionOfScreen\PortionOfScreen.vcxproj", "{72C5721B-89D7-4DB7-8809-752ADDBB4336}"
+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
+		{72C5721B-89D7-4DB7-8809-752ADDBB4336}.Debug|x64.ActiveCfg = Debug|x64
+		{72C5721B-89D7-4DB7-8809-752ADDBB4336}.Debug|x64.Build.0 = Debug|x64
+		{72C5721B-89D7-4DB7-8809-752ADDBB4336}.Debug|x86.ActiveCfg = Debug|Win32
+		{72C5721B-89D7-4DB7-8809-752ADDBB4336}.Debug|x86.Build.0 = Debug|Win32
+		{72C5721B-89D7-4DB7-8809-752ADDBB4336}.Release|x64.ActiveCfg = Release|x64
+		{72C5721B-89D7-4DB7-8809-752ADDBB4336}.Release|x64.Build.0 = Release|x64
+		{72C5721B-89D7-4DB7-8809-752ADDBB4336}.Release|x86.ActiveCfg = Release|Win32
+		{72C5721B-89D7-4DB7-8809-752ADDBB4336}.Release|x86.Build.0 = Release|Win32
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {F10A10F0-28A2-4D6C-86E4-E087B63BF1A0}
+	EndGlobalSection
+EndGlobal

PortionOfScreen/PortionOfScreen.cpp

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+// PortionOfScreen.cpp : Defines the entry point for the application.
+//
+
+#include "framework.h"
+#include "PortionOfScreen.h"
+#include "WinReg.hpp"
+
+#define MAX_LOADSTRING 100
+
+#define IDT_REDRAW 101
+
+// Global Variables:
+HINSTANCE hInst;                                // current instance
+WCHAR szTitle[MAX_LOADSTRING];                  // The title bar text
+WCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name
+
+// Forward declarations of functions included in this code module:
+ATOM                MyRegisterClass(HINSTANCE hInstance);
+BOOL                InitInstance(HINSTANCE, int);
+LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
+INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);
+void                LoadWindowPosition(RECT& rect);
+void                SaveWindowPosition(RECT& rect);
+
+int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
+                     _In_opt_ HINSTANCE hPrevInstance,
+                     _In_ LPWSTR    lpCmdLine,
+                     _In_ int       nCmdShow)
+{
+    UNREFERENCED_PARAMETER(hPrevInstance);
+    UNREFERENCED_PARAMETER(lpCmdLine);
+
+    // Initialize global strings
+    LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
+    LoadStringW(hInstance, IDC_PORTIONOFSCREEN, szWindowClass, MAX_LOADSTRING);
+    MyRegisterClass(hInstance);
+
+    // Perform application initialization:
+    if (!InitInstance (hInstance, nCmdShow))
+    {
+        return FALSE;
+    }
+
+    MSG msg;
+
+    // Main message loop:
+    while (GetMessage(&msg, nullptr, 0, 0))
+    {
+        TranslateMessage(&msg);
+        DispatchMessage(&msg);
+    }
+
+    return (int) msg.wParam;
+}
+
+
+
+//
+//  FUNCTION: MyRegisterClass()
+//
+//  PURPOSE: Registers the window class.
+//
+ATOM MyRegisterClass(HINSTANCE hInstance)
+{
+    WNDCLASSEXW wcex;
+
+    wcex.cbSize = sizeof(WNDCLASSEX);
+
+    wcex.style          = CS_HREDRAW | CS_VREDRAW;
+    wcex.lpfnWndProc    = WndProc;
+    wcex.cbClsExtra     = 0;
+    wcex.cbWndExtra     = 0;
+    wcex.hInstance      = hInstance;
+    wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_PORTIONOFSCREEN));
+    wcex.hCursor        = LoadCursor(nullptr, IDC_ARROW);
+    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
+    wcex.lpszMenuName   = nullptr;
+    wcex.lpszClassName  = szWindowClass;
+    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
+
+    return RegisterClassExW(&wcex);
+}
+
+//
+//   FUNCTION: InitInstance(HINSTANCE, int)
+//
+//   PURPOSE: Saves instance handle and creates main window
+//
+//   COMMENTS:
+//
+//        In this function, we save the instance handle in a global variable and
+//        create and display the main program window.
+//
+BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
+{
+   hInst = hInstance; // Store instance handle in our global variable
+
+   RECT rect;
+   LoadWindowPosition(rect);
+
+   HWND hWnd = CreateWindowExW(
+       WS_EX_LAYERED | WS_EX_TOPMOST | WS_EX_TRANSPARENT,
+       szWindowClass,
+       szTitle,
+       WS_OVERLAPPEDWINDOW,
+       rect.left,
+       rect.top,
+       rect.right - rect.left + 1,
+       rect.bottom - rect.top + 1,
+       nullptr,
+       nullptr,
+       hInstance,
+       nullptr);
+
+   if (!hWnd)
+   {
+      return FALSE;
+   }
+
+   ShowWindow(hWnd, nCmdShow);
+   SetLayeredWindowAttributes(hWnd, RGB(255, 255, 255), 128, LWA_ALPHA);
+   UpdateWindow(hWnd);
+
+   SetTimer(hWnd, IDT_REDRAW, 200, (TIMERPROC)NULL);
+
+   return TRUE;
+}
+
+//
+//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
+//
+//  PURPOSE: Processes messages for the main window.
+//
+LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+    switch (message)
+    {
+    case WM_LBUTTONUP:
+        DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
+        break;
+
+    case WM_SETFOCUS:
+        SetLayeredWindowAttributes(hWnd, RGB(255, 255, 255), 128, LWA_ALPHA);
+        SetWindowLong(hWnd, GWL_EXSTYLE, WS_EX_LAYERED | WS_EX_TOPMOST);
+        return DefWindowProc(hWnd, message, wParam, lParam);
+
+    case WM_KILLFOCUS:
+        SetLayeredWindowAttributes(hWnd, RGB(255, 255, 255), 0, LWA_ALPHA);
+        SetWindowLong(hWnd, GWL_EXSTYLE, WS_EX_LAYERED | WS_EX_TOPMOST | WS_EX_TRANSPARENT);
+        return DefWindowProc(hWnd, message, wParam, lParam);
+
+    case WM_TIMER:
+        switch (wParam)
+        {
+        case IDT_REDRAW:
+            InvalidateRect(hWnd, NULL, TRUE);
+        }
+        break;
+
+    case WM_ERASEBKGND:
+        break;
+
+    case WM_PAINT:
+    {
+        PAINTSTRUCT ps;
+        HDC hdc = BeginPaint(hWnd, &ps);
+        RECT rect;
+        GetWindowRect(hWnd, &rect);
+
+        HWND hwndDesktop = GetDesktopWindow();
+        HDC hdcDesktop = GetWindowDC(hwndDesktop);
+        POINT clientPoint = { 0, 0 };
+        ClientToScreen(hWnd, &clientPoint);
+
+        BitBlt(hdc, 0, 0, rect.right - rect.left + 1, rect.bottom - rect.top + 1, hdcDesktop, clientPoint.x, clientPoint.y, SRCCOPY);
+
+        ReleaseDC(hwndDesktop, hdcDesktop);
+        EndPaint(hWnd, &ps);
+    }
+    break;
+
+    case WM_DESTROY:
+    {
+        RECT rect;
+        GetWindowRect(hWnd, &rect);
+        SaveWindowPosition(rect);
+        PostQuitMessage(0);
+    }
+    break;
+
+    default:
+        return DefWindowProc(hWnd, message, wParam, lParam);
+    }
+
+    return 0;
+}
+
+// Message handler for about box.
+INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
+{
+    UNREFERENCED_PARAMETER(lParam);
+    switch (message)
+    {
+    case WM_INITDIALOG:
+        return (INT_PTR)TRUE;
+
+    case WM_COMMAND:
+        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
+        {
+            EndDialog(hDlg, LOWORD(wParam));
+            return (INT_PTR)TRUE;
+        }
+        break;
+    }
+    return (INT_PTR)FALSE;
+}
+
+void LoadWindowPosition(RECT& rect)
+{
+    try
+    {
+        winreg::RegKey  key{ HKEY_CURRENT_USER, L"SOFTWARE\\PortionOfScreen" };
+        rect.left = key.GetDwordValue(L"Left");
+        rect.top = key.GetDwordValue(L"Top");
+        rect.right = key.GetDwordValue(L"Right");
+        rect.bottom = key.GetDwordValue(L"Bottom");
+    }
+    catch(...)
+    {
+        rect.left = 100;
+        rect.top = 100;
+        rect.right = 900;
+        rect.bottom = 700;
+    }
+}
+
+void SaveWindowPosition(RECT& rect)
+{
+    winreg::RegKey  key{ HKEY_CURRENT_USER, L"SOFTWARE\\PortionOfScreen" };
+    key.SetDwordValue(L"Left", rect.left);
+    key.SetDwordValue(L"Top", rect.top);
+    key.SetDwordValue(L"Right", rect.right);
+    key.SetDwordValue(L"Bottom", rect.bottom);
+}

PortionOfScreen/PortionOfScreen.h

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+#pragma once
+
+#include "resource.h"