MiniDump不生成或者生成0字节

今天在使用C写一个Windows多线程程序时，发现退出过程中有段错误，为了方便快速的定位问题，我使用了MiniDump。

MiniDump.c源码如下：

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <windows.h>
#include <dbghelp.h>#pragma comment(lib, "dbghelp.lib")static LONG WINAPI ExceptionFilter(struct _EXCEPTION_POINTERS *ExceptionInfo)
{BOOL bDumpOK = FALSE;wchar_t strDumpFileName[8192];size_t len = 0;wchar_t szPath[MAX_PATH];if (GetModuleFileNameW(NULL, szPath, sizeof(szPath))){time_t now = time(NULL);struct tm *_t = localtime(&now);len = swprintf(strDumpFileName, MAX_PATH, L"%ls.%4d%02d%02d_%02d%02d%02d.dmp", szPath,_t->tm_year + 1900, _t->tm_mon + 1, _t->tm_mday, _t->tm_hour, _t->tm_min, _t->tm_sec);HANDLE hFile = CreateFileW(strDumpFileName, FILE_ALL_ACCESS, 0, NULL, CREATE_ALWAYS, 0, NULL);if (hFile != INVALID_HANDLE_VALUE){MINIDUMP_EXCEPTION_INFORMATION exception_information;exception_information.ThreadId = GetCurrentThreadId();exception_information.ExceptionPointers = ExceptionInfo;exception_information.ClientPointers = TRUE;if (MiniDumpWriteDump(GetCurrentProcess(), GetCurrentProcessId(), hFile, MiniDumpNormal, &exception_information, NULL, NULL))bDumpOK = TRUE;CloseHandle(hFile);}}if (bDumpOK){wchar_t *str = L"宕机了，MiniDump文件已经生成到：";size_t num = wcslen(str);memmove(&strDumpFileName[num], strDumpFileName, len * sizeof(wchar_t));memcpy(strDumpFileName, str, num * sizeof(wchar_t));MessageBoxW(NULL, strDumpFileName, L"提示", MB_OK);}else{MessageBoxW(NULL, L"宕机了，生成MiniDump文件失败。", L"提示", MB_OK);}return EXCEPTION_EXECUTE_HANDLER;
}void InitMiniDump()
{SetUnhandledExceptionFilter(ExceptionFilter);
}

但是测试了多次，要么是不能生成dump文件，要么生成的dump文件为0字节，之前在项目中使用C++时，专门做了一个CrashDumper的类，实际使用中是能够正常生成的：

MiniDump.h源码：

#ifndef _MINI_DUMPER_H_
#define _MINI_DUMPER_H_
#ifdef _MSC_VER#include <windows.h>#pragma comment(linker, "/include:?dumper@@3VCrashDumper@@A")class CrashDumper
{
public:CrashDumper();~CrashDumper();
};#endif
#endif

MiniDump.cpp源码：

#ifdef _MSC_VER
#pragma warning(disable:4091)
#include <windows.h>
#include <tchar.h>
#include <dbghelp.h>
#include <string>
#include "MiniDump.h"#pragma comment(lib, "dbghelp.lib")static LPTOP_LEVEL_EXCEPTION_FILTER m_OriginalFilter;
static LONG WINAPI ExceptionFilter(struct _EXCEPTION_POINTERS *ExceptionInfo)
{BOOL bDumpOK = FALSE;wchar_t strDumpFileName[8192];size_t len = 0;wchar_t szPath[MAX_PATH];if (GetModuleFileNameW(NULL, szPath, sizeof(szPath))){time_t now = time(NULL);struct tm *_t = localtime(&now);len = swprintf(strDumpFileName, MAX_PATH, L"%ls.%4d%02d%02d_%02d%02d%02d.dmp", szPath,_t->tm_year + 1900, _t->tm_mon + 1, _t->tm_mday, _t->tm_hour, _t->tm_min, _t->tm_sec);HANDLE hFile = CreateFileW(strDumpFileName, FILE_ALL_ACCESS, 0, NULL, CREATE_ALWAYS, 0, NULL);if (hFile != INVALID_HANDLE_VALUE){MINIDUMP_EXCEPTION_INFORMATION exception_information;exception_information.ThreadId = GetCurrentThreadId();exception_information.ExceptionPointers = ExceptionInfo;exception_information.ClientPointers = TRUE;if (MiniDumpWriteDump(GetCurrentProcess(), GetCurrentProcessId(), hFile, MiniDumpNormal, &exception_information, NULL, NULL))bDumpOK = TRUE;CloseHandle(hFile);}}if (bDumpOK){wchar_t *str = L"宕机了，MiniDump文件已经生成到：";size_t num = wcslen(str);memmove(&strDumpFileName[num], strDumpFileName, len * sizeof(wchar_t));memcpy(strDumpFileName, str, num * sizeof(wchar_t));MessageBoxW(NULL, strDumpFileName, L"提示", MB_OK);}else{MessageBoxW(NULL, L"宕机了，生成MiniDump文件失败。", L"提示", MB_OK);}return EXCEPTION_EXECUTE_HANDLER;
}CrashDumper dumper;
CrashDumper::CrashDumper()
{m_OriginalFilter = SetUnhandledExceptionFilter(ExceptionFilter);
}CrashDumper::~CrashDumper()
{SetUnhandledExceptionFilter(m_OriginalFilter);
}
#endif

实际使用中只需要包含CrashDumper的头文件即可，VC++的编译器会自动链接。

今天的MiniDump却不能正常工作，在ExceptionFilter函数中打日志，时而有输出，时而没输出，有输出都是在函数开头的日志有输出，后面的就没输出了。网上查询了一些资料：

SetUnhandledExceptionFilter无法捕获异常原因及解决方法
SetUnhandledExceptionFilter拦不住的崩溃
SetUnhandledExceptionFilter 的讨论
为什么SetUnhandledExceptionFilter不能捕获某些异常，而AddVectoredExceptionHandler可以捕获

使用了这些方面，发现还是不行，最后在主线程main函数返回前加了一句：