ImGUI 它是与平台无关的C++轻量级跨平台图形界面库，没有任何第三方依赖，可以将ImGUI的源码直接加到项目中使用，该框架通常会配合特定的D3Dx9等图形开发工具包一起使用，ImGUI常用来实现进程内的菜单功能，而有些辅助开发作者也会使用该框架开发菜单页面，总体来说这是一个很不错的绘图库，如下将公开新版ImGUI如何实现绘制外部菜单的功能。
ImGUI官方下载地址：https://github.com/ocornut/imgui/releases
在使用ImGUI页面之前需要先来实现一个简单的附着功能，即如何将一个窗体附着到另一个窗体之上，其实代码很简单，如下所示当用户输入进程PID时，会自动跟随窗体并附着在窗体顶部。
#include <Windows.h> #include <iostream> struct handle_data { unsigned long process_id; HWND best_handle; }; // By: LyShark BOOL IsMainWindow(HWND handle) { return GetWindow(handle, GW_OWNER) == (HWND)0 && IsWindowVisible(handle); } BOOL CALLBACK EnumWindowsCallback(HWND handle, LPARAM lParam) { // By: LyShark handle_data& data = *(handle_data*)lParam; unsigned long process_id = 0; GetWindowThreadProcessId(handle, &process_id); if (data.process_id != process_id || !IsMainWindow(handle)) { return TRUE; } data.best_handle = handle; return FALSE; } // By: LyShark HWND FindMainWindow(unsigned long process_id) { handle_data data; data.process_id = process_id; data.best_handle = 0; EnumWindows(EnumWindowsCallback, (LPARAM)&data); return data.best_handle; } int main(int argc, char* argv[]) { DWORD pid = 28396; std::cout << "输入进程PID: " << std::endl; std::cin >> pid; // 获取屏幕宽和高 int iWidth = ::GetSystemMetrics(SM_CXSCREEN); int iHeight = ::GetSystemMetrics(SM_CYSCREEN); // 根据PID寻找游戏窗口 HWND hwnd = FindMainWindow(pid); while (1) { SetTimer(hwnd, 1, 150, NULL); // 实现透明必须设置WS_EX_LAYERED标志 LONG lWinStyleEx = GetWindowLong(hwnd, GWL_EXSTYLE); lWinStyleEx = lWinStyleEx | WS_EX_LAYERED; SetWindowLong(hwnd, GWL_EXSTYLE, lWinStyleEx); SetLayeredWindowAttributes(hwnd, 0, RGB(40, 40, 40), LWA_ALPHA); // 去掉标题栏及边框 LONG_PTR Style = GetWindowLongPtr(hwnd, GWL_STYLE); Style = Style & ~WS_CAPTION & ~WS_SYSMENU & ~WS_SIZEBOX; SetWindowLongPtr(hwnd, GWL_STYLE, Style); // 至顶层窗口 最大化 SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, iWidth, iHeight, SWP_SHOWWINDOW); // 设置窗体可穿透鼠标 SetWindowLong(hwnd, GWL_EXSTYLE, WS_EX_TRANSPARENT | WS_EX_LAYERED); // 绘图 HDC hdc = ::GetDC(hwnd); HDC mdc = ::CreateCompatibleDC(hdc); // 创建画笔 HPEN hpen = CreatePen(PS_SOLID, 10, RGB(0, 255, 0)); // DC 选择画笔 SelectObject(hdc, hpen); // (画笔)从初始点移动到 50,50 MoveToEx(hdc, 100, 100, NULL); // (画笔)从初始点画线到 100,100 LineTo(hdc, 1000, 1000); RECT rect = {0}; rect.bottom = 10; rect.left = 20; rect.right = 20; rect.top = 15; DrawText(hdc, L"hello lyshark.com", strlen("hello lyshark.com"), &rect, DT_CALCRECT | DT_CENTER | DT_SINGLELINE); } return 0; } 绘制效果图：
接着我们使用Imgui绘制一个动态菜单，首先下载imgui并打开项目中的examples目录，找到example_win32_directx9打开后自己配置好dx9SDK开发工具包。
代码直接调用，并附加到Counter-Strike Source游戏窗体之上即可，这段代码也很简单。
#include "imgui.h" #include "imgui_impl_dx9.h" #include "imgui_impl_win32.h" #include <d3d9.h> #include <tchar.h> #include <iostream> #pragma execution_character_set("utf-8") // 全局变量 // lyshark.com static HWND hwnd; static HWND GameHwnd; static RECT WindowRectangle; static int WindowWide, WindowHeight; static LPDIRECT3D9 g_pD3D = NULL; static LPDIRECT3DDEVICE9 g_pd3dDevice = NULL; static D3DPRESENT_PARAMETERS g_d3dpp = {}; // 单选框设置状态 bool show_another_window = false; // imgui 回调函数 extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam); // By: LyShark bool CreateDeviceD3D(HWND hWnd) { if ((g_pD3D = Direct3DCreate9(D3D_SDK_VERSION)) == NULL) { return false; } ZeroMemory(&g_d3dpp, sizeof(g_d3dpp)); g_d3dpp.Windowed = TRUE; g_d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; g_d3dpp.BackBufferFormat = D3DFMT_UNKNOWN; g_d3dpp.EnableAutoDepthStencil = TRUE; g_d3dpp.AutoDepthStencilFormat = D3DFMT_D16; g_d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_ONE; if (g_pD3D->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd, D3DCREATE_HARDWARE_VERTEXPROCESSING, &g_d3dpp, &g_pd3dDevice) < 0) { return false; } return true; } void CleanupDeviceD3D() { if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = NULL; } if (g_pD3D) { g_pD3D->Release(); g_pD3D = NULL; } } void ResetDevice() { ImGui_ImplDX9_InvalidateDeviceObjects(); HRESULT hr = g_pd3dDevice->Reset(&g_d3dpp); if (hr == D3DERR_INVALIDCALL) { IM_ASSERT(0); } ImGui_ImplDX9_CreateDeviceObjects(); } LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) { if (ImGui_ImplWin32_WndProcHandler(hWnd, msg, wParam, lParam)) { return true; } switch (msg) { case WM_SIZE: if (g_pd3dDevice != NULL && wParam != SIZE_MINIMIZED) { g_d3dpp.BackBufferWidth = LOWORD(lParam); g_d3dpp.BackBufferHeight = HIWORD(lParam); ResetDevice(); } return 0; case WM_SYSCOMMAND: if ((wParam & 0xfff0) == SC_KEYMENU) { return 0; } break; case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hWnd, msg, wParam, lParam); } // 绘制主方法 // www.cnblogs.com/lyshark void DrawImGUI() { // 启动IMGUI自绘 ImGui_ImplDX9_NewFrame(); ImGui_ImplWin32_NewFrame(); ImGui::NewFrame(); static float f = 0.0f; static int counter = 0; static char sz[256] = { 0 }; ImGui::Begin("LyShark 辅助GUI主菜单"); ImGui::Text("这是一段测试字符串"); ImGui::Checkbox("弹出子窗口", &show_another_window); ImGui::SliderFloat("浮点条", &f, 0.0f, 1.0f); ImGui::InputText("输入内容", sz, 256, 0, 0, 0); if (ImGui::Button("点我触发")) counter++; ImGui::SameLine(); ImGui::Text("触发次数 = %d", counter); ImGui::Text("当前FPS: %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate); ImGui::End(); if (show_another_window) { ImGui::Begin("我是子窗体", &show_another_window); ImGui::Text(" 您好,LyShark !"); if (ImGui::Button("关闭窗体")) show_another_window = false; ImGui::End(); } ImGui::EndFrame(); } // 自身窗口循环事件 void WindowMessageLoop() { bool done = false; while (!done) { // 每次都将窗体置顶并跟随游戏窗体移动 GetWindowRect(GameHwnd, &WindowRectangle); WindowWide = (WindowRectangle.right) - (WindowRectangle.left); WindowHeight = (WindowRectangle.bottom) - (WindowRectangle.top); DWORD dwStyle = GetWindowLong(GameHwnd, GWL_STYLE); if (dwStyle & WS_BORDER) { WindowRectangle.top += 23; WindowHeight -= 23; } // 跟随窗口移动 MoveWindow(hwnd, WindowRectangle.left + 8, WindowRectangle.top + 8, WindowWide - 11, WindowHeight - 11, true); // 开始消息循环 MSG msg; while (PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE)) { TranslateMessage(&msg); DispatchMessage(&msg); if (msg.message == WM_QUIT) { done = true; } } if (done) { break; } // 开始绘制 DrawImGUI(); g_pd3dDevice->SetRenderState(D3DRS_ZENABLE, FALSE); g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, FALSE); g_pd3dDevice->SetRenderState(D3DRS_SCISSORTESTENABLE, FALSE); g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, 0, 1.0f, 0); if (g_pd3dDevice->BeginScene() >= 0) { ImGui::Render(); ImGui_ImplDX9_RenderDrawData(ImGui::GetDrawData()); g_pd3dDevice->EndScene(); } HRESULT result = g_pd3dDevice->Present(NULL, NULL, NULL, NULL); if (result == D3DERR_DEVICELOST && g_pd3dDevice->TestCooperativeLevel() == D3DERR_DEVICENOTRESET) { ResetDevice(); } } } int main(int argc, char *argv[]) { // 注册窗体类 WNDCLASSEX wc; // 附加到指定窗体上 wc.cbClsExtra = NULL; wc.cbSize = sizeof(WNDCLASSEX); wc.cbWndExtra = NULL; wc.hbrBackground = (HBRUSH)CreateSolidBrush(RGB(0, 0, 0)); wc.hCursor = LoadCursor(0, IDC_ARROW); wc.hIcon = LoadIcon(0, IDI_APPLICATION); wc.hIconSm = LoadIcon(0, IDI_APPLICATION); wc.hInstance = GetModuleHandle(NULL); wc.lpfnWndProc = (WNDPROC)WndProc; wc.lpszClassName = L" "; wc.lpszMenuName = L" "; wc.style = CS_VREDRAW | CS_HREDRAW; RegisterClassEx(&wc); // 得到窗口句柄 GameHwnd = FindWindowA(NULL, "Counter-Strike Source"); GetWindowRect(GameHwnd, &WindowRectangle); WindowWide = WindowRectangle.right - WindowRectangle.left; WindowHeight = WindowRectangle.bottom - WindowRectangle.top; // 创建窗体 hwnd = CreateWindowEx(WS_EX_TOPMOST | WS_EX_LAYERED | WS_EX_TOOLWINDOW, L" ", L" ", WS_POPUP, 1, 1, WindowWide, WindowHeight, 0, 0, wc.hInstance, 0); // 显示窗口 SetLayeredWindowAttributes(hwnd, 0, RGB(0, 0, 0), LWA_ALPHA); SetLayeredWindowAttributes(hwnd, 0, RGB(0, 0, 0), LWA_COLORKEY); ShowWindow(hwnd, SW_SHOW); // 初始化D3D if (!CreateDeviceD3D(hwnd)) { CleanupDeviceD3D(); UnregisterClass(wc.lpszClassName, wc.hInstance); return 0; } // 更新窗体 UpdateWindow(hwnd); // 初始化ImGUI ImGui::CreateContext(); ImGuiIO& io = ImGui::GetIO(); (void)io; io.Fonts->AddFontFromFileTTF("c:/windows/fonts/simhei.ttf", 13.0f, NULL, io.Fonts->GetGlyphRangesChineseSimplifiedCommon()); ImGui::StyleColorsDark(); ImGui_ImplWin32_Init(hwnd); ImGui_ImplDX9_Init(g_pd3dDevice); // 开始执行绘制循环事件 WindowMessageLoop(); ImGui_ImplDX9_Shutdown(); ImGui_ImplWin32_Shutdown(); ImGui::DestroyContext(); CleanupDeviceD3D(); DestroyWindow(hwnd); UnregisterClass(wc.lpszClassName, wc.hInstance); return 0; } 绘制效果如下：
另外，Imgui也支持绘制到整个屏幕上，也可以当作全局GUI界面来使用。
#include "imgui.h" #include "imgui_impl_dx9.h" #include "imgui_impl_win32.h" #include <d3d9.h> #include <tchar.h> #include <iostream> #pragma execution_character_set("utf-8") // 全局变量 static HWND hwnd; static HWND GameHwnd; static RECT WindowRectangle; static int WindowWide, WindowHeight; static LPDIRECT3D9 g_pD3D = NULL; static LPDIRECT3DDEVICE9 g_pd3dDevice = NULL; static D3DPRESENT_PARAMETERS g_d3dpp = {}; // 单选框设置状态 bool show_another_window = false; // imgui 回调函数 // By: LyShark extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam); bool CreateDeviceD3D(HWND hWnd) { if ((g_pD3D = Direct3DCreate9(D3D_SDK_VERSION)) == NULL) { return false; } ZeroMemory(&g_d3dpp, sizeof(g_d3dpp)); g_d3dpp.Windowed = TRUE; g_d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; g_d3dpp.BackBufferFormat = D3DFMT_UNKNOWN; g_d3dpp.EnableAutoDepthStencil = TRUE; g_d3dpp.AutoDepthStencilFormat = D3DFMT_D16; g_d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_ONE; if (g_pD3D->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd, D3DCREATE_HARDWARE_VERTEXPROCESSING, &g_d3dpp, &g_pd3dDevice) < 0) { return false; } return true; } void CleanupDeviceD3D() { if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = NULL; } if (g_pD3D) { g_pD3D->Release(); g_pD3D = NULL; } } // https://www.cnblogs.com/lyshark void ResetDevice() { ImGui_ImplDX9_InvalidateDeviceObjects(); HRESULT hr = g_pd3dDevice->Reset(&g_d3dpp); if (hr == D3DERR_INVALIDCALL) { IM_ASSERT(0); } ImGui_ImplDX9_CreateDeviceObjects(); } LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) { if (ImGui_ImplWin32_WndProcHandler(hWnd, msg, wParam, lParam)) { return true; } switch (msg) { case WM_SIZE: if (g_pd3dDevice != NULL && wParam != SIZE_MINIMIZED) { g_d3dpp.BackBufferWidth = LOWORD(lParam); g_d3dpp.BackBufferHeight = HIWORD(lParam); ResetDevice(); } return 0; case WM_SYSCOMMAND: if ((wParam & 0xfff0) == SC_KEYMENU) { return 0; } break; case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hWnd, msg, wParam, lParam); } // 绘制主方法 // lyshark.com void DrawImGUI() { // 启动IMGUI自绘 ImGui_ImplDX9_NewFrame(); ImGui_ImplWin32_NewFrame(); ImGui::NewFrame(); static float f = 0.0f; static int counter = 0; static char sz[256] = { 0 }; ImGui::Begin("LyShark 辅助GUI主菜单"); ImGui::Text("这是一段测试字符串"); ImGui::Checkbox("弹出子窗口", &show_another_window); ImGui::SliderFloat("浮点条", &f, 0.0f, 1.0f); ImGui::InputText("输入内容", sz, 256, 0, 0, 0); if (ImGui::Button("点我触发")) counter++; ImGui::SameLine(); ImGui::Text("触发次数 = %d", counter); ImGui::Text("当前FPS: %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate); ImGui::End(); if (show_another_window) { ImGui::Begin("我是子窗体", &show_another_window); ImGui::Text(" 您好,LyShark !"); if (ImGui::Button("关闭窗体")) show_another_window = false; ImGui::End(); } ImGui::EndFrame(); } // 自身窗口循环事件 void WindowMessageLoop() { bool done = false; while (!done) { // 每次都将窗体置顶并跟随游戏窗体移动 GetWindowRect(GameHwnd, &WindowRectangle); WindowWide = (WindowRectangle.right) - (WindowRectangle.left); WindowHeight = (WindowRectangle.bottom) - (WindowRectangle.top); DWORD dwStyle = GetWindowLong(GameHwnd, GWL_STYLE); if (dwStyle & WS_BORDER) { WindowRectangle.top += 23; WindowHeight -= 23; } // 跟随窗口移动 MoveWindow(hwnd, WindowRectangle.left + 8, WindowRectangle.top + 8, WindowWide - 11, WindowHeight - 11, true); // 开始消息循环 MSG msg; while (PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE)) { TranslateMessage(&msg); DispatchMessage(&msg); if (msg.message == WM_QUIT) { done = true; } } if (done) { break; } // 开始绘制 DrawImGUI(); g_pd3dDevice->SetRenderState(D3DRS_ZENABLE, FALSE); g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, FALSE); g_pd3dDevice->SetRenderState(D3DRS_SCISSORTESTENABLE, FALSE); g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, 0, 1.0f, 0); if (g_pd3dDevice->BeginScene() >= 0) { ImGui::Render(); ImGui_ImplDX9_RenderDrawData(ImGui::GetDrawData()); g_pd3dDevice->EndScene(); } HRESULT result = g_pd3dDevice->Present(NULL, NULL, NULL, NULL); if (result == D3DERR_DEVICELOST && g_pd3dDevice->TestCooperativeLevel() == D3DERR_DEVICENOTRESET) { ResetDevice(); } } } int main(int argc, char *argv[]) { // 注册窗体类 WNDCLASSEX wc; // 附加到整个屏幕上 wc.cbClsExtra = NULL; wc.cbSize = sizeof(WNDCLASSEX); wc.cbWndExtra = NULL; wc.hbrBackground = (HBRUSH)CreateSolidBrush(RGB(0, 0, 0)); wc.hCursor = LoadCursor(0, IDC_ARROW); wc.hIcon = LoadIcon(0, IDI_APPLICATION); wc.hIconSm = LoadIcon(0, IDI_APPLICATION); wc.hInstance = GetModuleHandle(NULL); wc.lpfnWndProc = (WNDPROC)WndProc; wc.lpszClassName = L" "; wc.lpszMenuName = L" "; wc.style = CS_VREDRAW | CS_HREDRAW; ::RegisterClassEx(&wc); // 屏幕宽度和高度 WindowWide = GetSystemMetrics(SM_CXSCREEN); WindowHeight = GetSystemMetrics(SM_CYSCREEN); // 创建窗体 HWND hwnd = CreateWindowEx(WS_EX_TOPMOST | WS_EX_LAYERED | WS_EX_TOOLWINDOW, L" ", L" ", WS_POPUP, 1, 1, WindowWide, WindowHeight, 0, 0, wc.hInstance, 0); // 显示窗口 SetLayeredWindowAttributes(hwnd, 0, 1.0f, LWA_ALPHA); SetLayeredWindowAttributes(hwnd, 0, RGB(0, 0, 0), LWA_COLORKEY); ShowWindow(hwnd, SW_SHOW); // 初始化D3D if (!CreateDeviceD3D(hwnd)) { CleanupDeviceD3D(); UnregisterClass(wc.lpszClassName, wc.hInstance); return 0; } // 更新窗体 UpdateWindow(hwnd); // 初始化ImGUI ImGui::CreateContext(); ImGuiIO& io = ImGui::GetIO(); (void)io; io.Fonts->AddFontFromFileTTF("c:/windows/fonts/simhei.ttf", 13.0f, NULL, io.Fonts->GetGlyphRangesChineseSimplifiedCommon()); ImGui::StyleColorsDark(); ImGui_ImplWin32_Init(hwnd); ImGui_ImplDX9_Init(g_pd3dDevice); // 开始执行绘制循环事件 WindowMessageLoop(); ImGui_ImplDX9_Shutdown(); ImGui_ImplWin32_Shutdown(); ImGui::DestroyContext(); CleanupDeviceD3D(); DestroyWindow(hwnd); UnregisterClass(wc.lpszClassName, wc.hInstance); return 0; } 绘制效果如下：
