Crash test - DLL Hook

最新推荐文章于 2025-08-15 16:04:36 发布

zjh517

最新推荐文章于 2025-08-15 16:04:36 发布

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分类专栏： VC++ 文章标签： hook crash dll keyboard callback 测试

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本文介绍了一种通过DLLHook技术使测试产品在指定条件下Crash的方法，以便评估Crash后用户友好对话框（CER）的有效性。通过安装键盘Hook监听特定组合键，如Ctrl+Alt+Backspace，触发异常以模拟Crash场景。

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近期有个测试项目，要求产品crash后用户友好的对话框（CER)会弹出来，而不是出现 unhandle exception. 测试方案是人为的让产品crash，

然后看CER能不能工作。Test Design要求在不同的场合crash都能被CER捕获, 所以将导致crash的代码写在所有需要测试的地方不是一个好的方

案，一个理想的情况是，测试者可能让产品在任何时候crash，所以用DLL Hook监听键盘，当测试者按下某些组合键，比如Ctrl+Alt+Backspace的时候，执行Hook 的callback函数（里面有导致crash的代码）,让产品crash,来测试CER是否能在产品运行的任何时候都起作用.

Windows Hook简介，见MSDN,这里省略了：）

简单的步骤如下：

Create a dll which will be used to create hook, store the dll instance at dllmain, e.g.

HHOOK g_hHook; HINSTANCE g_hinstDll; BOOL APIENTRY DllMain( HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved ) { switch (ul_reason_for_call) { case DLL_PROCESS_ATTACH: g_hinstDll = (HINSTANCE )hModule;//Record the module instance case DLL_THREAD_ATTACH: case DLL_THREAD_DETACH: case DLL_PROCESS_DETACH: //Uninstall hook when detach dll from exe process UninstallHook(); break; } return TRUE; }

2. Create a dll export function which will install a hook, note that, in order to crash the test product, I am going to set a local hook instead of global one, code snippet looks like below, our product(.exe) will call this method when need to install the hook.

extern"C"__declspec(dllexport) bool InstallHook() { // WH_KEYBOARD monitor keyboard event(up and down) g_hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)HookProc,g_hinstDll,::GetCurrentThreadId()); // for global hook, pass 0 instead of GetCurrentThreadId in the SetWindowsHookEx return (g_hHook ? true : false); }

3. Create a method used to uninstall the hook, in the project, which will be called when our product detach the dll, it also can be call outside the dll(e.g. test product) as I declare it as an export function

extern"C"__declspec(dllexport) bool UninstallHook() { if(g_hHook) return(UnhookWindowsHookEx(g_hHook)); return true; }

4. at last, define the hook callback function which will be called when keyboard event happened in this case

LRESULT CALLBACK HookProc(int nCode,WPARAM wParam,LPARAM lParam) { //Some actions when keyboard event happened //in the project ,I derefernece a null pointer //If user pressed ctrl+alt+backspace int *p = NULL; int j = *p; //null pointer exception return(CallNextHookEx(g_hHook,nCode,wParam,lParam)); }