一般要捕获异常只需要两个函数：
SetUnhandledExceptionFilter截获异常；
MiniDumpWriteDump写dump文件。但是由于CRT函数可能会在内部调用SetUnhandledExceptionFilter(NULL)，解除我们程序设置的异常处理，这导致我们的程序无法完整捕获崩溃。另外，还有一部分非异常的CRT错误，不属于SEH异常捕获的范畴，需要通过_set_invalid_parameter_handler、_set_purecall_handler拦截，否则会弹出很丑陋的Runtime Error提示框。为保证所有异常都能由我们捕获，需要把SetUnhandledExceptionFilter函数Hook掉，不让“其他人”去设置自己的Exception处理，有Exception我们自己搞定；还有，对CRT错误做拦截，避免弹出错误窗口：_set_invalid_parameter_handler、_set_purecall_handler。
chromium的breakpad当前只是使用了上边提到的_set_invalid_parameter_handler、_set_purecall_handler函数，并没有屏蔽“其他人”的SetUnhandledExceptionFilter行为，可能导致了部分Crash无法捕获，为什么不这么做呢？有待考察。（stackoverflow也有人提到这个问题：
http://stackoverflow.com/questions/11350801/why-does-google-breakpad-not-handle-all-crashes-how-can-i-debug-these-cases）。
进程内捕获dump示例代码：
.h
1 namespace CatchDumpFile
2 {
3
4 void simple_log(const std::wstring& log_msg);
5
6 class CDumpCatch
7 {
8 public:
9 CDumpCatch();
10 ~CDumpCatch();
11 private:
12
13 static LPTOP_LEVEL_EXCEPTION_FILTER WINAPI TempSetUnhandledExceptionFilter(LPTOP_LEVEL_EXCEPTION_FILTER lpTopLevelExceptionFilter);
14 static BOOL ReleaseDumpFile(const std::wstring& strPath, EXCEPTION_POINTERS *pException);
15 static LONG WINAPI UnhandledExceptionFilterEx(struct _EXCEPTION_POINTERS *pException);
16 static void MyPureCallHandler(void);
17 static void MyInvalidParameterHandler(const wchar_t* expression, const wchar_t* function, const wchar_t* file, unsigned int line, uintptr_t pReserved);
18
19
20 BOOL AddExceptionHandle();
21 BOOL RemoveExceptionHandle();
22 BOOL PreventSetUnhandledExceptionFilter();
23 void SetInvalidHandle();
24 void UnSetInvalidHandle();
25 private:
26 LPTOP_LEVEL_EXCEPTION_FILTER m_preFilter;
27 _invalid_parameter_handler m_preIph;
28 _purecall_handler m_prePch;
29 };
30 };
.cc
1 namespace CatchDumpFile
2 {
3 void simple_log(const std::wstring& log_msg)
4 {
5 std::wstring strLogWnd = L"cswuyg_simple_debug_log";
6 HWND hSend = ::FindWindow(NULL, strLogWnd.c_str());
7 COPYDATASTRUCT copydate;
8 copydate.cbData = (DWORD)(log_msg.length() + 1) * sizeof(wchar_t);
9 copydate.lpData = (PVOID)log_msg.c_str();
10 ::SendMessage(hSend, WM_COPYDATA, 0, (LPARAM)©date);
11 }
12
13 void CDumpCatch::MyPureCallHandler(void)
14 {
15 //simple_log(L"MyPureCallHandler");
16 throw std::invalid_argument("");
17 }
18
19 void CDumpCatch::MyInvalidParameterHandler(const wchar_t* expression, const wchar_t* function, const wchar_t* file, unsigned int line, uintptr_t pReserved)
20 {
21 //simple_log(L"MyPureCallHandler");
22 //The parameters all have the value NULL unless a debug version of the CRT library is used.
23 throw std::invalid_argument("");
24 }
25
26 void CDumpCatch::SetInvalidHandle()
27 {
28 #if _MSC_VER >= 1400 // MSVC 2005/8
29 m_preIph = _set_invalid_parameter_handler(MyInvalidParameterHandler);
30 #endif // _MSC_VER >= 1400
31 m_prePch = _set_purecall_handler(MyPureCallHandler); //At application, this call can stop show the error message box.
32 }
33 void CDumpCatch::UnSetInvalidHandle()
34 {
35 #if _MSC_VER >= 1400 // MSVC 2005/8
36 _set_invalid_parameter_handler(m_preIph);
37 #endif // _MSC_VER >= 1400
38 _set_purecall_handler(m_prePch); //At application this can stop show the error message box.
39 }
40
41 LPTOP_LEVEL_EXCEPTION_FILTER WINAPI CDumpCatch::TempSetUnhandledExceptionFilter( LPTOP_LEVEL_EXCEPTION_FILTER lpTopLevelExceptionFilter )
42 {
43 return NULL;
44 }
45
46 BOOL CDumpCatch::AddExceptionHandle()
47 {
48 m_preFilter = ::SetUnhandledExceptionFilter(UnhandledExceptionFilterEx);
49 PreventSetUnhandledExceptionFilter();
50 return TRUE;
51 }
52
53 BOOL CDumpCatch::RemoveExceptionHandle()
54 {
55 if(m_preFilter != NULL)
56 {
57 ::SetUnhandledExceptionFilter(m_preFilter);
58 m_preFilter = NULL;
59 }
60 return TRUE;
61 }
62
63 CDumpCatch::CDumpCatch()
64 {
65 SetInvalidHandle();
66 AddExceptionHandle();
67 }
68
69 CDumpCatch::~CDumpCatch()
70 {
71 UnSetInvalidHandle();
72 RemoveExceptionHandle();
73 }
74
75 BOOL CDumpCatch::ReleaseDumpFile(const std::wstring& strPath, EXCEPTION_POINTERS *pException)
76 {
77 HANDLE hDumpFile = ::CreateFile(strPath.c_str(), GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
78 if (hDumpFile == INVALID_HANDLE_VALUE)
79 {
80 return FALSE;
81 }
82 MINIDUMP_EXCEPTION_INFORMATION dumpInfo;
83 dumpInfo.ExceptionPointers = pException;
84 dumpInfo.ThreadId = ::GetCurrentThreadId();
85 dumpInfo.ClientPointers = TRUE;
86 // ::MiniDumpWriteDump(::GetCurrentProcess(), ::GetCurrentProcessId(), hDumpFile, MiniDumpNormal, &dumpInfo, NULL, NULL);
87 BOOL bRet = ::MiniDumpWriteDump(::GetCurrentProcess(), ::GetCurrentProcessId(), hDumpFile, MiniDumpWithFullMemory, &dumpInfo, NULL, NULL);
88 ::CloseHandle(hDumpFile);
89 return bRet;
90 }
91
92 LONG WINAPI CDumpCatch::UnhandledExceptionFilterEx( struct _EXCEPTION_POINTERS *pException )
93 {
94 //simple_log(L"UnhandledExceptionFilterEx");
95 wchar_t szPath[MAX_PATH] = { 0 };
96 ::GetModuleFileName(NULL, szPath, MAX_PATH);
97 ::PathRemoveFileSpec(szPath);
98 std::wstring strPath = szPath;
99 strPath += L"\\CrashDumpFile.dmp";
100 BOOL bRelease = ReleaseDumpFile(strPath.c_str(), pException);
101 //::FatalAppExit(0, L"Error");
102 if (bRelease)
103 {
104 return EXCEPTION_EXECUTE_HANDLER;
105 }
106 return EXCEPTION_CONTINUE_SEARCH;
107 }
108
109 BOOL CDumpCatch::PreventSetUnhandledExceptionFilter()
110 {
111 HMODULE hKernel32 = LoadLibrary(L"kernel32.dll");
112 if (hKernel32 == NULL)
113 {
114 return FALSE;
115 }
116 void *pOrgEntry = ::GetProcAddress(hKernel32, "SetUnhandledExceptionFilter");
117 if(pOrgEntry == NULL)
118 {
119 return FALSE;
120 }
121
122 unsigned char newJump[5];
123 DWORD dwOrgEntryAddr = (DWORD)pOrgEntry;
124 dwOrgEntryAddr += 5; //jump instruction has 5 byte space.
125
126 void *pNewFunc = &TempSetUnhandledExceptionFilter;
127 DWORD dwNewEntryAddr = (DWORD)pNewFunc;
128 DWORD dwRelativeAddr = dwNewEntryAddr - dwOrgEntryAddr;
129
130 newJump[0] = 0xE9; //jump
131 memcpy(&newJump[1], &dwRelativeAddr, sizeof(DWORD));
132 SIZE_T bytesWritten;
133 DWORD dwOldFlag, dwTempFlag;
134 ::VirtualProtect(pOrgEntry, 5, PAGE_READWRITE, &dwOldFlag);
135 BOOL bRet = ::WriteProcessMemory(::GetCurrentProcess(), pOrgEntry, newJump, 5, &bytesWritten);
136 ::VirtualProtect(pOrgEntry, 5, dwOldFlag, &dwTempFlag);
137 return bRet;
138 }
139
140 }
能引发pure function called 错误的代码：
class IPureCall
{
public:
virtual ~IPureCall(){};
IPureCall()
{
//indirect call the virtual function, the compiler would not treat as "static binding", it is "dynamic binding".
//At this time, the CPureCall class hasn't been constructed, the virtual table didn't has the pure_call function's point, so it cause "pure virtual function called exception".
call_by_constructor();
};
virtual void pure_call() = 0;
void call_by_constructor()
{
pure_call();
}
};
class CPureCall : public IPureCall
{
public:
CPureCall()
{
}
void pure_call()
{
}
};
pure virtual function called在之前的文章里介绍过（
http://www.cnblogs.com/cswuyg/archive/2012/08/22/2650610.html）。
进程外捕获崩溃的做法是使用进程间通信（IPC，内存映射文件或者管道都行），把EXCEPTION_POINTERS指针数据等信息通知捕获进程，让捕获进程去写dump（
windows下捕获dump之Google breakpad_client的理解）。
进程外捕获dump是比较推荐的做法，chromium的breakpad文档解释说，“一般认为在崩溃进程内部写minidump是不安全的：关键的进程数据结构可能会被破坏掉，或者异常处理程序获取到的堆栈可能是被覆盖了的”（原文：
http://code.google.com/p/google-breakpad/wiki/GettingStartedWithBreakpad）。
可复用源码分享：https://github.com/cswuyg/simple_win/tree/master/dump_catch/dump_catch
多模块dump处理相关补充：
1、如果CRT是/MD，那么CRT错误捕获EXE、DLL共用；dump捕获多EXE、DLL共用，只需要在EXE里加上处理就ok；
2、如果CRT是/MT，那么CRT错误捕获各PE文件独立，
EXE、DLL必须有自己的处理；dump捕获多EXE、DLL共用。
这方面的知识MSDN也稍有提及：
http://technet.microsoft.com/zh-cn/library/t296ys27(v=vs.71)
http://msdn.microsoft.com/en-us/library/windows/desktop/ms680634(v=vs.85).aspx
不错的编程资料：
不错的抓dump工具介绍：
breakpad相关代码：
分类:
win32&MFC
