圖形編程丨圖形繪制基礎(chǔ)imgui篇—D3D9 HOOK 創(chuàng)建內(nèi)部Imgui窗口
作者：小阿栗
Imgui又稱為Dear ImGui，它是與平臺(tái)無關(guān)的C++輕量級(jí)跨平臺(tái)圖形界面庫，沒有任何第三方依賴，可以將Imgui的源碼直接加到項(xiàng)目中使用，也可以編譯成dll, Imgui使用DX或者OpenGL進(jìn)行界面渲染，Imgui主要用于游戲行業(yè)。
這里我們需要用到兩個(gè)工具Detours-master（微軟的hook庫）和imgui-master，主要講D3D9HOOK。
我們先來創(chuàng)建一個(gè)DLL項(xiàng)目。步驟如下：
1.選擇新建項(xiàng)目
2.選擇Windows桌面->動(dòng)態(tài)鏈接庫（DLL）->D3D9HOOK，點(diǎn)擊確定
3.刪除framework.h、pch.h以及pch.cpp文件。添加一個(gè)dllmain.h頭文件
4.dllmain.cpp中要包含頭文件添加#include <Windows.h>
5. 配置
5.1 選擇屬性
5.2 修改運(yùn)行庫以及Spectre緩解，選擇應(yīng)用
5.3 配置include路徑，點(diǎn)擊“宏”，搜索DX，根據(jù)地址找到文件位置，將 $(DXSDK_DIR)include填入，應(yīng)用
5.4 搜索DX，將$(DXSDK_DIR)Lib填入，搜索$(platformTarget)，將$(DXSDK_DIR)lib\$(platformTarget)填入，應(yīng)用
（圖片注釋：配置好會(huì)自動(dòng)匹配x86/x64不需要再改）
5.5 新增d3d9.lib，d3dx9.lib這兩個(gè)依賴項(xiàng)，應(yīng)用
6. 配置好環(huán)境后，編譯HOOK庫(編譯x86和x64兩個(gè)版本)
X86：找到Visual Studio2017，打開“x86 Native Tools Prompt for VS 2017”，然后cd到路徑里nmake進(jìn)行編譯
X64：找到Visual Studio2017，打開“適用于VS 2017的 x64 本機(jī)工具命令提示”，然后cd到路徑里nmake進(jìn)行編譯
7.打開項(xiàng)目文件夾
8.新建一個(gè)目錄Detours，將lib.x86、lib.x64和include復(fù)制過來（將lib.去掉方便后續(xù)識(shí)別）
9.新建篩選器，命名Detours
10.在Detours中添加現(xiàn)有項(xiàng)，選定兩個(gè)頭文件detours.h和detver.h
11.配置lib庫
11.1選擇屬性
11.2 編輯包含目錄，宏-包含目錄-$(ProjectDir)Detours\include，應(yīng)用
11.3編輯附加庫目錄，宏-附加庫目錄-$(ProjectDir)Detours\Lib\$(platformTarget)，應(yīng)用
11.4 編輯附加依賴項(xiàng)，添加detours.lib，應(yīng)用
11.5 不使用預(yù)編譯頭
12.配置imgui
12.1在D3D9HOOK目錄下，新建imgui文件夾，將imgui-master中backends里imgui_impl_dx9.cpp、imgui_impl_dx9.h和imgui_impl_win32.cpp、imgui_impl_win32.h；及主目錄下所有.cpp和.h都復(fù)制到imgui文件夾中
12.2新建篩選器，命名imgui
12.3在imgui中添加現(xiàn)有項(xiàng)，選定目錄下所有文件
12.4.dllmain.h中包含導(dǎo)進(jìn)來的所有頭文件
13.主線程imgui窗口的實(shí)現(xiàn)
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.測(cè)試
14.1打開文件夾，把動(dòng)態(tài)鏈接庫D3D9HOOK.dll粘貼到桌面上
14.2打開pick，啟動(dòng)代碼注入器，將動(dòng)態(tài)鏈接庫D3D9HOOK.dll進(jìn)行注入
測(cè)試成功：在pick左上角出現(xiàn)窗口<span
這樣，就手動(dòng)創(chuàng)建了一個(gè)基礎(chǔ)的imgui的框架<span
