图形编程丨图形绘制基础imgui篇—D3D9 HOOK 创建内部Imgui窗口

作者：小阿栗

 

Imgui又称为Dear 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，也可以编译成dll, Imgui使用DX或者OpenGL进行界面渲染，Imgui主要用于游戏行业。

这里我们需要用到两个工具Detours-master（微软的hook库）和imgui-master，主要讲D3D9HOOK。

我们先来创建一个DLL项目。步骤如下：

1.选择新建项目

2.选择Windows桌面->动态链接库（DLL）->D3D9HOOK，点击确定

3.删除framework.h、pch.h以及pch.cpp文件。添加一个dllmain.h头文件

4.dllmain.cpp中要包含头文件添加#include <Windows.h>

5. 配置

5.1 选择属性

5.2 修改运行库以及Spectre缓解，选择应用

5.3 配置include路径，点击“宏”，搜索DX，根据地址找到文件位置，将 $(DXSDK_DIR)include填入，应用

5.4 搜索DX，将$(DXSDK_DIR)Lib填入，搜索$(platformTarget)，将$(DXSDK_DIR)lib\$(platformTarget)填入，应用

（图片注释：配置好会自动匹配x86/x64不需要再改）

5.5 新增d3d9.lib，d3dx9.lib这两个依赖项，应用

6. 配置好环境后，编译HOOK库(编译x86和x64两个版本)

X86：找到Visual Studio2017，打开“x86 Native Tools Prompt for VS 2017”，然后cd到路径里nmake进行编译

X64：找到Visual Studio2017，打开“适用于VS 2017的 x64 本机工具命令提示”，然后cd到路径里nmake进行编译

7.打开项目文件夹

8.新建一个目录Detours，将lib.x86、lib.x64和include复制过来（将lib.去掉方便后续识别）

9.新建筛选器，命名Detours

10.在Detours中添加现有项，选定两个头文件detours.h和detver.h

11.配置lib库

11.1选择属性

11.2 编辑包含目录，宏-包含目录-$(ProjectDir)Detours\include，应用

11.3编辑附加库目录，宏-附加库目录-$(ProjectDir)Detours\Lib\$(platformTarget)，应用

11.4 编辑附加依赖项，添加detours.lib，应用

11.5 不使用预编译头

12.配置imgui

12.1在D3D9HOOK目录下，新建imgui文件夹，将imgui-master中backends里imgui_impl_dx9.cpp、imgui_impl_dx9.h和imgui_impl_win32.cpp、imgui_impl_win32.h；及主目录下所有.cpp和.h都复制到imgui文件夹中

12.2新建筛选器，命名imgui

12.3在imgui中添加现有项，选定目录下所有文件

12.4.dllmain.h中包含导进来的所有头文件

13.主线程imgui窗口的实现

typedef HRESULT (WINAPI * FuncReset)(IDirect3DDevice9 *pIDirect3DDevice9,D3DPRESENT_PARAMETERS *pPresentationParameters);

typedef HRESULT (WINAPI *  FuncEndScene)(IDirect3DDevice9 *pIDirect3DDevice9);

typedef LRESULT(WINAPI * FuncWndProc)(const HWND, UINT, WPARAM, LPARAM);

HWND g_hWnd = NULL;

IDirect3D9 * g_IDirect3D9;

D3DPRESENT_PARAMETERS g_d3dpp;

IDirect3DDevice9* g_pIDirect3DDevice9;

FuncReset OldReset;

FuncEndScene OldEndScene;

FuncWndProc OldWndProc;

DWORD * dwDeviceVirtualTable = NULL;

extern LRESULT ImGui_ImplWin32_WndProcHandler(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);

LRESULT WINAPI GrkWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

{

if (ImGui_ImplWin32_WndProcHandler(hWnd, message, wParam, lParam))

{

    return TRUE;

}

return CallWindowProc(OldWndProc, hWnd, message, wParam, lParam);

}

VOID StartHook(PVOID * OldFunctionAddr, PVOID NewFunctionAddr)

{

DetourTransactionBegin();

DetourUpdateThread(GetCurrentThread());

DetourAttach(OldFunctionAddr, NewFunctionAddr);

DetourTransactionCommit();

}

VOID UnHook(PVOID * OldFunctionAddr, PVOID NewFunctionAddr)

{

DetourTransactionBegin();

DetourUpdateThread(GetCurrentThread());

DetourDetach(OldFunctionAddr, NewFunctionAddr);

DetourTransactionCommit();

}

HRESULT WINAPI GrkReset(IDirect3DDevice9 *pIDirect3DDevice9, D3DPRESENT_PARAMETERS *d3dpp)

{

UnHook((PVOID*)(&OldReset), GrkReset);

ImGui_ImplDX9_InvalidateDeviceObjects();

HRESULT bRet = pIDirect3DDevice9->Reset(d3dpp);

ImGui_ImplDX9_CreateDeviceObjects();

StartHook((PVOID*)(&OldReset), GrkReset);

return bRet;

}

HRESULT WINAPI GrkEndScene(IDirect3DDevice9 *pIDirect3DDevice9)

{

UnHook((PVOID*)(&OldEndScene), GrkEndScene);

static bool bFlag = TRUE;

if (bFlag)

{

    bFlag = FALSE;

    IMGUI_CHECKVERSION();

    ImGui::CreateContext();

    ImGuiIO & io = ImGui::GetIO();

    io.ConfigFlags = ImGuiConfigFlags_NoMouseCursorChange;

    io.WantSaveIniSettings = false;

    io.IniFilename = NULL;

    ImGui::StyleColorsClassic();

    ImFontConfig imfConfig;

    imfConfig.FontDataOwnedByAtlas = false;

    ImGui_ImplWin32_Init(g_hWnd);

    ImGui_ImplDX9_Init(pIDirect3DDevice9);

    OldWndProc = (WNDPROC)SetWindowLongPtr(g_hWnd, GWL_WNDPROC, (LONG_PTR)GrkWndProc);

}

HRESULT hRet = pIDirect3DDevice9->EndScene();

ImGui_ImplDX9_NewFrame();

ImGui_ImplWin32_NewFrame();

ImGui::NewFrame();

ImGui::SetNextWindowPos(ImVec2(0, 0), ImGuiCond_FirstUseEver);

ImGui::SetNextWindowSize(ImVec2(300, 300));

ImGui::Begin("GrkTools");

ImGui::End();

ImGui::EndFrame();

ImGui::Render();

ImGui_ImplDX9_RenderDrawData(ImGui::GetDrawData());

StartHook((PVOID*)(&OldEndScene), GrkEndScene);

return hRet;

}

DWORD WindowThreadCallBack(LPVOID lpBuffer)

{

g_hWnd = FindWindowA("Direct3DWindowClass", NULL);

g_IDirect3D9 = Direct3DCreate9(D3D_SDK_VERSION);

memset(&g_d3dpp, 0, 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;

HRESULT hRet = g_IDirect3D9->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, g_hWnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING, &g_d3dpp, &g_pIDirect3DDevice9);

dwDeviceVirtualTable = (DWORD *)*(DWORD *)g_pIDirect3DDevice9;

OldReset = (FuncReset)dwDeviceVirtualTable[16];

OldEndScene = (FuncEndScene)dwDeviceVirtualTable[42];

StartHook((PVOID*)(&OldReset), GrkReset);

StartHook((PVOID*)(&OldEndScene), GrkEndScene);

return 0;

}

BOOL APIENTRY DllMain( HMODULE hModule,

DWORD  ul_reason_for_call,

LPVOID lpReserved

)

{

switch (ul_reason_for_call)

{

case DLL_PROCESS_ATTACH:

    CreateThread(NULL, NULL, (LPTHREAD_START_ROUTINE)WindowThreadCallBack, NULL, NULL, NULL);

    break;

case DLL_THREAD_ATTACH:

    break;

case DLL_THREAD_DETACH:

    break;

case DLL_PROCESS_DETACH:

break;

}

return TRUE;

}

14.测试

14.1打开文件夹，把动态链接库D3D9HOOK.dll粘贴到桌面上

14.2打开pick，启动代码注入器，将动态链接库D3D9HOOK.dll进行注入

测试成功：在pick左上角出现窗口<span

这样，就手动创建了一个基础的imgui的框架<span