Add sources

.clang-format

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+---
+BasedOnStyle: WebKit
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+AlignConsecutiveBitFields: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlines: DontAlign
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+AllowShortBlocksOnASingleLine: Never
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortEnumsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: InlineOnly
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLambdasOnASingleLine: Inline
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: true
+AlwaysBreakTemplateDeclarations: Yes
+BinPackArguments: true
+BinPackParameters: false
+BraceWrapping:
+  AfterCaseLabel: true
+  AfterClass: true
+  AfterControlStatement: Always
+  AfterEnum: true
+  AfterFunction: true
+  AfterNamespace: false
+  AfterStruct: true
+  AfterUnion: true
+  AfterExternBlock: false
+  BeforeCatch: true
+  BeforeElse: true
+  BeforeLambdaBody: true
+  BeforeWhile: true
+  IndentBraces: false
+  SplitEmptyFunction: true
+  SplitEmptyRecord: true
+  SplitEmptyNamespace: true
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Custom
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializers: BeforeColon
+BreakInheritanceList: BeforeColon
+BreakStringLiterals: true
+ColumnLimit: 100
+CompactNamespaces: false
+ConstructorInitializerAllOnOneLineOrOnePerLine: true
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: true
+DeriveLineEnding: true
+DerivePointerAlignment: false
+DisableFormat: false
+FixNamespaceComments: true
+IncludeBlocks: Regroup
+IncludeCategories:
+  - Regex: '^.*Private[.]h"'
+    Priority: 0
+  - Regex: '^".*[.]pb[.]h"'
+    Priority: 2
+  - Regex: '^".*[.]h"'
+    Priority: 1
+  - Regex: '^<boost/.*>'
+    Priority: 5
+  - Regex: '^<.*([.]h|[.]hpp)>'
+    Priority: 3
+  - Regex: '^<queue>'
+    Priority: 6
+  - Regex: '^<Q.*>'
+    Priority: 4
+  - Regex: '^<.*>'
+    Priority: 6
+IndentCaseBlocks: false
+IndentCaseLabels: false
+IndentExternBlock: NoIndent
+IndentGotoLabels: false
+IndentPPDirectives: None
+IndentWidth: 4
+IndentWrappedFunctionNames: false
+KeepEmptyLinesAtTheStartOfBlocks: false
+Language: Cpp
+MaxEmptyLinesToKeep: 2
+NamespaceIndentation: None
+PenaltyExcessCharacter: 10
+PointerAlignment: Left
+ReflowComments: true
+SortIncludes: true
+SortUsingDeclarations: true
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCpp11BracedList: false
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeInheritanceColon: true
+SpaceBeforeParens: ControlStatements
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceBeforeSquareBrackets: false
+SpaceInEmptyBlock: false
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles: false
+SpacesInCStyleCastParentheses: false
+SpacesInConditionalStatement: false
+SpacesInContainerLiterals: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+Standard: c++14
+StatementMacros: ['Q_UNUSED']
+TabWidth: 4
+UseCRLF: false
+UseTab: ForIndentation
+
+...

.gitignore

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+cmake-build-*
+.idea

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.1)
+project(screen-resolution-changer CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /SUBSYSTEM:WINDOWS /ENTRY:mainCRTStartup")
+
+add_executable(screen-resolution-changer WIN32 main.cpp)

main.cpp

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+#include <Windows.h>
+
+#include <optional>
+#include <string>
+
+std::optional<DEVMODE> setScreenResolution(int width, int height)
+{
+	DEVMODE prevMode;
+	DEVMODE devMode;
+
+	ZeroMemory(&devMode, sizeof(DEVMODE));
+	devMode.dmSize = sizeof(DEVMODE);
+
+	if (!EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &devMode))
+		return std::nullopt;
+
+	CopyMemory(&prevMode, &devMode, sizeof(DEVMODE));
+	devMode.dmPelsWidth = width;
+	devMode.dmPelsHeight = height;
+
+	if (ChangeDisplaySettingsEx(NULL, &devMode, NULL, 0, NULL) == DISP_CHANGE_SUCCESSFUL)
+		return prevMode;
+	else
+		return std::nullopt;
+}
+
+bool restoreScreenResolution(DEVMODE& mode)
+{
+	return ChangeDisplaySettingsEx(NULL, &mode, NULL, 0, NULL) == DISP_CHANGE_SUCCESSFUL;
+}
+
+bool executeProgram(std::string command)
+{
+	STARTUPINFO si;
+	ZeroMemory(&si, sizeof(si));
+	si.cb = sizeof(si);
+
+	PROCESS_INFORMATION pi;
+	ZeroMemory(&pi, sizeof(pi));
+
+	if (CreateProcess(NULL, command.data(), NULL, NULL, FALSE, CREATE_NO_WINDOW, NULL, NULL, &si, &pi))
+	{
+		WaitForSingleObject(pi.hProcess, INFINITE);
+		CloseHandle(pi.hProcess);
+		CloseHandle(pi.hThread);
+		return true;
+	}
+	else
+		return false;
+}
+
+void showError(const char* message)
+{
+	MessageBox(NULL, message, "Error", MB_OK);
+}
+
+void showUsage()
+{
+	showError(
+	    "Usage:\n"
+	    "screen-resolution-changer.exe <width> <height> <executable> [args...]");
+}
+
+int main(int argc, char* argv[])
+{
+	if (argc < 4)
+	{
+		showUsage();
+		return 1;
+	}
+
+	unsigned int width = 0;
+	unsigned int height = 0;
+
+	try
+	{
+		width = std::stoi(argv[1]);
+		height = std::stoi(argv[2]);
+	}
+	catch (const std::exception& e)
+	{
+		showUsage();
+		return 1;
+	}
+
+	std::string command = argv[3];
+	for (int i = 4; i < argc; i++)
+		command.append(" ").append(argv[i]);
+
+	auto prevMode = setScreenResolution(width, height);
+	if (prevMode)
+	{
+		int result = 1;
+		if (executeProgram(command))
+			result = 0;
+		else
+		{
+			result = 1;
+			showError("Failed to start application");
+		}
+
+		if (restoreScreenResolution(*prevMode))
+			return result;
+		else
+		{
+			showError("Failed to restore screen resolution");
+			return 1;
+		}
+	}
+	else
+	{
+		showError("Failed to change screen resolution");
+		return 1;
+	}
+}