前面介绍如如何用WinDBG 生成crash dump 《WinDBG 技巧:如何生成Dump 文件(.dump 命令) 》,但是用户机器上通常不安装WinDBG, 而且多数用户也不知道怎么使用WinDBG。 所以最好是自己程序里面能够捕捉exception/crash,并且生成crash dump,然后通过网络传回到自己服务器。
捕捉exception 可以用API 函数 SetUnhandledExceptionFilter 。生成crash dump 可以用DbgHelp.dll 里面的MiniDumpWriteDump 函数。
LPTOP_LEVEL_EXCEPTION_FILTER WINAPI SetUnhandledExceptionFilter( __in LPTOP_LEVEL_EXCEPTION_FILTER lpTopLevelExceptionFilter );
BOOL WINAPI MiniDumpWriteDump( __in HANDLE hProcess, __in DWORD ProcessId, __in HANDLE hFile, __in MINIDUMP_TYPE DumpType, __in PMINIDUMP_EXCEPTION_INFORMATION ExceptionParam, __in PMINIDUMP_USER_STREAM_INFORMATION UserStreamParam, __in PMINIDUMP_CALLBACK_INFORMATION CallbackParam );
代码示例:
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#include <dbghelp.h>
#include <shellapi.h>
#include <shlobj.h>
// 自定义的exectpion filter
LONG WINAPI MyUnhandledExceptionFilter(struct _EXCEPTION_POINTERS *pExceptionPointers)
{
SetErrorMode( SEM_NOGPFAULTERRORBOX );
//收集信息
CStringW strBuild;
strBuild.Format(L"Build: %s %s", __DATE__, __TIME__);
CStringW strError;
HMODULE hModule;
WCHAR szModuleName[MAX_PATH] = L"";
GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS, (LPCWSTR)pExceptionPointers->ExceptionRecord->ExceptionAddress, &hModule);
GetModuleFileName(hModule, szModuleName, ARRAYSIZE(szModuleName));
strError.AppenedFormat(L"%s %d , %d ,%d.", szModuleName,pExceptionPointers->ExceptionRecord->ExceptionCode, pExceptionPointers->ExceptionRecord->ExceptionFlags, pExceptionPointers->ExceptionRecord->ExceptionAddress);
//生成 mini crash dump
BOOL bMiniDumpSuccessful;
WCHAR szPath[MAX_PATH];
WCHAR szFileName[MAX_PATH];
WCHAR* szAppName = L"AppName";
WCHAR* szVersion = L"v1.0";
DWORD dwBufferSize = MAX_PATH;
HANDLE hDumpFile;
SYSTEMTIME stLocalTime;
MINIDUMP_EXCEPTION_INFORMATION ExpParam;
GetLocalTime( &stLocalTime );
GetTempPath( dwBufferSize, szPath );
StringCchPrintf( szFileName, MAX_PATH, L"%s%s", szPath, szAppName );
CreateDirectory( szFileName, NULL );
StringCchPrintf( szFileName, MAX_PATH, L"%s%s\\%s-%04d%02d%02d-%02d%02d%02d-%ld-%ld.dmp",
szPath, szAppName, szVersion,
stLocalTime.wYear, stLocalTime.wMonth, stLocalTime.wDay,
stLocalTime.wHour, stLocalTime.wMinute, stLocalTime.wSecond,
GetCurrentProcessId(), GetCurrentThreadId());
hDumpFile = CreateFile(szFileName, GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_WRITE|FILE_SHARE_READ, 0, CREATE_ALWAYS, 0, 0);
MINIDUMP_USER_STREAM UserStream[2];
MINIDUMP_USER_STREAM_INFORMATION UserInfo;
UserInfo.UserStreamCount = 1;
UserInfo.UserStreamArray = UserStream;
UserStream[0].Type = CommentStreamW;
UserStream[0].BufferSize = strBuild.GetLength()*sizeof(WCHAR);
UserStream[0].Buffer = strBuild.GetBuffer();
UserStream[1].Type = CommentStreamW;
UserStream[1].BufferSize = strError.GetLength()*sizeof(WCHAR);
UserStream[1].Buffer = strError.GetBuffer();
ExpParam.ThreadId = GetCurrentThreadId();
ExpParam.ExceptionPointers = pExceptionPointers;
ExpParam.ClientPointers = TRUE;
MINIDUMP_TYPE MiniDumpWithDataSegs = MiniDumpNormal
| MiniDumpWithHandleData
| MiniDumpWithUnloadedModules
| MiniDumpWithIndirectlyReferencedMemory
| MiniDumpScanMemory
| MiniDumpWithProcessThreadData
| MiniDumpWithThreadInfo;
bMiniDumpSuccessful = MiniDumpWriteDump(GetCurrentProcess(), GetCurrentProcessId(),
hDumpFile, MiniDumpWithDataSegs, &ExpParam, NULL, NULL);
// 上传mini dump 到自己服务器(略)
...
return EXCEPTION_CONTINUE_SEARCH; //或者 EXCEPTION_EXECUTE_HANDLER 关闭程序
}
int _tmain()
{
// 设置 execption filter
SetUnhandledExceptionFilter(MyUnhandledExceptionFilter);
....
return 0;
}
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