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Win32 WebView2 C++ Implementation
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‎src/webview/win32_wv2.cpp‎

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/*
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WebUI Library
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Win32 WebView2 C++ Implementation
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https://webui.me
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https://github.com/webui-dev/webui
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Copyright (c) 2020-2025 Hassan Draga.
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Licensed under MIT License.
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All rights reserved.
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Canada.
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*/
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#ifdef _WIN32
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#include "win32_wv2.hpp"
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#include "WebView2.h"
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#include <wrl.h>
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#include <cstdio>
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using namespace Microsoft::WRL;
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class WebView2Instance {
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public:
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ComPtr<ICoreWebView2Environment> webviewEnvironment;
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ComPtr<ICoreWebView2Controller> webviewController;
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ComPtr<ICoreWebView2> webviewWindow;
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HWND hwnd;
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wchar_t* url;
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bool navigate, size, position, stop;
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int width, height, x, y;
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WebView2Instance()
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: hwnd(nullptr), url(nullptr), navigate(false), size(false)
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, position(false), stop(false), width(800), height(600), x(0), y(0) {}
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~WebView2Instance() {
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if (url) free(url);
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}
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};
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class TitleChangedHandler : public RuntimeClass<RuntimeClassFlags<ClassicCom>, ICoreWebView2DocumentTitleChangedEventHandler> {
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WebView2Instance* instance;
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public:
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TitleChangedHandler(WebView2Instance* inst) : instance(inst) {}
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HRESULT STDMETHODCALLTYPE Invoke(ICoreWebView2* sender, IUnknown* args) override {
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(void)args;
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if (sender && instance->hwnd) {
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LPWSTR newTitle = nullptr;
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sender->get_DocumentTitle(&newTitle);
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if (newTitle) {
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SetWindowTextW(instance->hwnd, newTitle);
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CoTaskMemFree(newTitle);
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}
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}
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return S_OK;
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}
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};
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class ControllerCompletedHandler : public RuntimeClass<RuntimeClassFlags<ClassicCom>, ICoreWebView2CreateCoreWebView2ControllerCompletedHandler> {
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WebView2Instance* instance;
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public:
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ControllerCompletedHandler(WebView2Instance* inst) : instance(inst) {}
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HRESULT STDMETHODCALLTYPE Invoke(HRESULT result, ICoreWebView2Controller* controller) override {
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if (SUCCEEDED(result) && controller) {
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instance->webviewController = controller;
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controller->get_CoreWebView2(&instance->webviewWindow);
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ComPtr<ICoreWebView2Settings> settings;
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if (SUCCEEDED(instance->webviewWindow->get_Settings(&settings))) {
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settings->put_IsScriptEnabled(TRUE);
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settings->put_AreDefaultScriptDialogsEnabled(TRUE);
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settings->put_IsWebMessageEnabled(TRUE);
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#ifdef WEBUI_LOG
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settings->put_AreDevToolsEnabled(TRUE);
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#else
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settings->put_AreDevToolsEnabled(FALSE);
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#endif
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}
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RECT bounds = {0, 0, instance->width, instance->height};
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controller->put_Bounds(bounds);
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auto titleHandler = Make<TitleChangedHandler>(instance);
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EventRegistrationToken token;
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instance->webviewWindow->add_DocumentTitleChanged(titleHandler.Get(), &token);
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if (instance->url) {
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instance->webviewWindow->Navigate(instance->url);
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}
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}
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return S_OK;
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}
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};
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class EnvironmentCompletedHandler : public RuntimeClass<RuntimeClassFlags<ClassicCom>, ICoreWebView2CreateCoreWebView2EnvironmentCompletedHandler> {
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WebView2Instance* instance;
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public:
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EnvironmentCompletedHandler(WebView2Instance* inst) : instance(inst) {}
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HRESULT STDMETHODCALLTYPE Invoke(HRESULT result, ICoreWebView2Environment* env) override {
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if (SUCCEEDED(result) && env) {
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instance->webviewEnvironment = env;
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auto controllerHandler = Make<ControllerCompletedHandler>(instance);
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env->CreateCoreWebView2Controller(instance->hwnd, controllerHandler.Get());
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}
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return S_OK;
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}
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};
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extern "C" {
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_webui_win32_wv2_handle _webui_win32_wv2_create(void) {
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return static_cast<_webui_win32_wv2_handle>(new WebView2Instance());
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}
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void _webui_win32_wv2_free(_webui_win32_wv2_handle handle) {
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if (!handle) return;
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WebView2Instance* instance = static_cast<WebView2Instance*>(handle);
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if (instance->webviewWindow) instance->webviewWindow.Reset();
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if (instance->webviewController) instance->webviewController.Reset();
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if (instance->webviewEnvironment) instance->webviewEnvironment.Reset();
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delete instance;
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}
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bool _webui_win32_wv2_navigate(_webui_win32_wv2_handle handle, wchar_t* url) {
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if (!handle) return false;
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WebView2Instance* instance = static_cast<WebView2Instance*>(handle);
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if (instance->webviewWindow && url) {
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return SUCCEEDED(instance->webviewWindow->Navigate(url));
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}
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return false;
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}
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bool _webui_win32_wv2_set_position(_webui_win32_wv2_handle handle, int x, int y) {
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if (!handle) return false;
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WebView2Instance* instance = static_cast<WebView2Instance*>(handle);
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return instance->hwnd && SetWindowPos(instance->hwnd, NULL, x, y, 0, 0, SWP_NOSIZE | SWP_NOZORDER);
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}
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bool _webui_win32_wv2_set_size(_webui_win32_wv2_handle handle, int width, int height) {
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if (!handle) return false;
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WebView2Instance* instance = static_cast<WebView2Instance*>(handle);
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return instance->hwnd && SetWindowPos(instance->hwnd, NULL, 0, 0, width, height, SWP_NOMOVE | SWP_NOREPOSITION);
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}
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bool _webui_win32_wv2_maximize(_webui_win32_wv2_handle handle) {
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if (!handle) return false;
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WebView2Instance* instance = static_cast<WebView2Instance*>(handle);
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return instance->hwnd && ShowWindow(instance->hwnd, SW_MAXIMIZE);
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}
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bool _webui_win32_wv2_minimize(_webui_win32_wv2_handle handle) {
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if (!handle) return false;
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WebView2Instance* instance = static_cast<WebView2Instance*>(handle);
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return instance->hwnd && ShowWindow(instance->hwnd, SW_MINIMIZE);
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}
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HWND _webui_win32_wv2_get_hwnd(_webui_win32_wv2_handle handle) {
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return handle ? static_cast<WebView2Instance*>(handle)->hwnd : nullptr;
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}
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void _webui_win32_wv2_set_hwnd(_webui_win32_wv2_handle handle, HWND hwnd) {
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if (handle) static_cast<WebView2Instance*>(handle)->hwnd = hwnd;
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}
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void _webui_win32_wv2_set_stop(_webui_win32_wv2_handle handle, bool stop) {
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if (handle) static_cast<WebView2Instance*>(handle)->stop = stop;
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}
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bool _webui_win32_wv2_get_stop(_webui_win32_wv2_handle handle) {
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return handle ? static_cast<WebView2Instance*>(handle)->stop : false;
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}
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void _webui_win32_wv2_set_navigate_flag(_webui_win32_wv2_handle handle, bool navigate) {
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if (handle) static_cast<WebView2Instance*>(handle)->navigate = navigate;
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}
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void _webui_win32_wv2_set_size_flag(_webui_win32_wv2_handle handle, bool size) {
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if (handle) static_cast<WebView2Instance*>(handle)->size = size;
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}
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void _webui_win32_wv2_set_position_flag(_webui_win32_wv2_handle handle, bool position) {
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if (handle) static_cast<WebView2Instance*>(handle)->position = position;
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}
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bool _webui_win32_wv2_get_navigate_flag(_webui_win32_wv2_handle handle) {
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return handle ? static_cast<WebView2Instance*>(handle)->navigate : false;
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}
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bool _webui_win32_wv2_get_size_flag(_webui_win32_wv2_handle handle) {
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return handle ? static_cast<WebView2Instance*>(handle)->size : false;
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}
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bool _webui_win32_wv2_get_position_flag(_webui_win32_wv2_handle handle) {
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return handle ? static_cast<WebView2Instance*>(handle)->position : false;
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}
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void _webui_win32_wv2_set_url(_webui_win32_wv2_handle handle, wchar_t* url) {
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if (!handle) return;
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WebView2Instance* instance = static_cast<WebView2Instance*>(handle);
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if (instance->url) free(instance->url);
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if (url) {
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size_t len = wcslen(url) + 1;
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instance->url = (wchar_t*)malloc(len * sizeof(wchar_t));
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if (instance->url) wcscpy_s(instance->url, len, url);
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} else {
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instance->url = nullptr;
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}
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}
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wchar_t* _webui_win32_wv2_get_url(_webui_win32_wv2_handle handle) {
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return handle ? static_cast<WebView2Instance*>(handle)->url : nullptr;
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}
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void _webui_win32_wv2_set_dimensions(_webui_win32_wv2_handle handle, int x, int y, int width, int height) {
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if (!handle) return;
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WebView2Instance* instance = static_cast<WebView2Instance*>(handle);
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instance->x = x;
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instance->y = y;
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instance->width = width;
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instance->height = height;
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}
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void _webui_win32_wv2_get_dimensions(_webui_win32_wv2_handle handle, int* x, int* y, int* width, int* height) {
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if (!handle) return;
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WebView2Instance* instance = static_cast<WebView2Instance*>(handle);
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if (x) *x = instance->x;
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if (y) *y = instance->y;
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if (width) *width = instance->width;
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if (height) *height = instance->height;
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}
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bool _webui_win32_wv2_create_environment(_webui_win32_wv2_handle handle, wchar_t* cacheFolder) {
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if (!handle) return false;
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WebView2Instance* instance = static_cast<WebView2Instance*>(handle);
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_wputenv(L"WEBVIEW2_ADDITIONAL_BROWSER_ARGUMENTS=--enable-features=msWebView2EnableDraggableRegions");
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typedef HRESULT (__stdcall *CreateCoreWebView2EnvironmentWithOptionsFunc)(
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PCWSTR, PCWSTR, ICoreWebView2EnvironmentOptions*,
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ICoreWebView2CreateCoreWebView2EnvironmentCompletedHandler*);
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HMODULE webviewLib = LoadLibraryA("WebView2Loader.dll");
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if (!webviewLib) return false;
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CreateCoreWebView2EnvironmentWithOptionsFunc createEnv =
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(CreateCoreWebView2EnvironmentWithOptionsFunc)GetProcAddress(webviewLib, "CreateCoreWebView2EnvironmentWithOptions");
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if (!createEnv) {
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FreeLibrary(webviewLib);
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return false;
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}
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auto environmentHandler = Make<EnvironmentCompletedHandler>(instance);
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if (!environmentHandler) {
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FreeLibrary(webviewLib);
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return false;
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}
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HRESULT hr = createEnv(NULL, cacheFolder, NULL, environmentHandler.Get());
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return SUCCEEDED(hr);
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}
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void* _webui_win32_wv2_get_controller(_webui_win32_wv2_handle handle) {
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return handle ? static_cast<WebView2Instance*>(handle)->webviewController.Get() : nullptr;
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}
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}
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#endif

‎src/webview/win32_wv2.hpp‎

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/*
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WebUI Library
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Win32 WebView2 C++ Implementation
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https://webui.me
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https://github.com/webui-dev/webui
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Copyright (c) 2020-2025 Hassan Draga.
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Licensed under MIT License.
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All rights reserved.
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Canada.
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*/
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#ifndef WEBUI_WIN32_WV2_HPP
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#define WEBUI_WIN32_WV2_HPP
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#ifdef _WIN32
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#include <windows.h>
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#include <wchar.h>
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#include <stdbool.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct _webui_window_t _webui_window_t;
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typedef void* _webui_win32_wv2_handle;
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_webui_win32_wv2_handle _webui_win32_wv2_create(void);
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void _webui_win32_wv2_free(_webui_win32_wv2_handle handle);
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bool _webui_win32_wv2_navigate(_webui_win32_wv2_handle handle, wchar_t* url);
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bool _webui_win32_wv2_set_position(_webui_win32_wv2_handle handle, int x, int y);
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bool _webui_win32_wv2_set_size(_webui_win32_wv2_handle handle, int width, int height);
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bool _webui_win32_wv2_maximize(_webui_win32_wv2_handle handle);
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bool _webui_win32_wv2_minimize(_webui_win32_wv2_handle handle);
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HWND _webui_win32_wv2_get_hwnd(_webui_win32_wv2_handle handle);
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void _webui_win32_wv2_set_hwnd(_webui_win32_wv2_handle handle, HWND hwnd);
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void _webui_win32_wv2_set_stop(_webui_win32_wv2_handle handle, bool stop);
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bool _webui_win32_wv2_get_stop(_webui_win32_wv2_handle handle);
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void _webui_win32_wv2_set_navigate_flag(_webui_win32_wv2_handle handle, bool navigate);
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void _webui_win32_wv2_set_size_flag(_webui_win32_wv2_handle handle, bool size);
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void _webui_win32_wv2_set_position_flag(_webui_win32_wv2_handle handle, bool position);
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bool _webui_win32_wv2_get_navigate_flag(_webui_win32_wv2_handle handle);
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bool _webui_win32_wv2_get_size_flag(_webui_win32_wv2_handle handle);
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bool _webui_win32_wv2_get_position_flag(_webui_win32_wv2_handle handle);
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void _webui_win32_wv2_set_url(_webui_win32_wv2_handle handle, wchar_t* url);
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wchar_t* _webui_win32_wv2_get_url(_webui_win32_wv2_handle handle);
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void _webui_win32_wv2_set_dimensions(_webui_win32_wv2_handle handle, int x, int y, int width, int height);
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void _webui_win32_wv2_get_dimensions(_webui_win32_wv2_handle handle, int* x, int* y, int* width, int* height);
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bool _webui_win32_wv2_create_environment(_webui_win32_wv2_handle handle, wchar_t* cacheFolder);
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void* _webui_win32_wv2_get_controller(_webui_win32_wv2_handle handle);
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#ifdef __cplusplus
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}
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#endif
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#endif // _WIN32
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#endif // WEBUI_WIN32_WV2_HPP

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