SymGetLineFromAddr无法正常工作

时间:2014-03-17 20:59:00

标签: c++ winapi visual-c++ stack dbghelp

我有以下代码:

#include "stdafx.h"
#include <process.h>
#include <iostream>
#include <Windows.h>
#include "dbghelp.h"

using namespace std;

int LogStackTrace()
{
    void *stack[1024];
    HANDLE process = GetCurrentProcess();
    SymInitialize(process, NULL, TRUE);
    WORD numberOfFrames = CaptureStackBackTrace(0, 1000, stack, NULL);
    SYMBOL_INFO *symbol = (SYMBOL_INFO *)malloc(sizeof(SYMBOL_INFO));
    symbol->MaxNameLen = 1024;
    symbol->SizeOfStruct = sizeof(SYMBOL_INFO);
    IMAGEHLP_LINE *line = (IMAGEHLP_LINE *)malloc(sizeof(IMAGEHLP_LINE));
    line->SizeOfStruct = sizeof(IMAGEHLP_LINE);
    printf("Caught exception ");
    for (int i = 0; i < numberOfFrames; i++)
    {
        SymFromAddr(process, (DWORD64)(stack[i]), NULL, symbol);
        SymGetLineFromAddr(process, (DWORD)(stack[i]), NULL, line);
        printf("at %s in %s, address 0x%0X\n", symbol->Name, line->FileName, symbol->Address);
    }
    return 0;
}

void function2()
{
    int a = 0;
    int b = 0;
    throw new exception("Expected exception.");
}

void function1()
{
    int a = 0;
    function2();
}

void function0()
{
    function1();
}

static void threadFunction(void *param)
{
    try
    {
        function0();
    }
    catch (...)
    {
        LogStackTrace();
    }
}

int _tmain(int argc, _TCHAR* argv[])
{
    try
    {
        _beginthread(threadFunction, 0, NULL);
    }
    catch (...)
    {
        LogStackTrace();
    }
    printf("Press any key to exit.\n");
    cin.get();
    return 0;
}

问题在于,此行总是出错:printf("at %s in %s, address 0x%0X\n", symbol->Name, line->FileName, symbol->Address);

原因是因为line的FileName似乎是NULL。实际上,整个线路结构搞砸了。我正在尝试编写一个应用程序来显示错误的堆栈跟踪。但那是为什么呢?它不应该使用上面的代码吗? PS我作为一个简单的MSVC ++控制台应用程序对Win32进行了编译。

2 个答案:

答案 0 :(得分:2)

SYMBOL_INFO *symbol = (SYMBOL_INFO *)malloc(sizeof(SYMBOL_INFO));
symbol->MaxNameLen = 1024;
symbol->SizeOfStruct = sizeof(SYMBOL_INFO);

The documentation for SizeOfStruct州:

  

结构的大小,以字节为单位。必须将此成员设置为sizeof(SYMBOL_INFO)。 请注意,数据的总大小是SizeOfStruct +(MaxNameLen - 1)* sizeof(TCHAR)。减去1的原因是名称中的第一个字符的大小是结构。

强调我的。您必须分配至少sizeof(SYMBOL_INFO) + MaxNameLen + 1个字节的存储空间。您只分配sizeof(SYMBOL_INFO)个字节。

答案 1 :(得分:2)

您的代码存在同样的问题(Windows 7 64b,Unicode 32位版本,VS2012 Express)

修正了:

DWORD dwDisplacement;
SymGetLineFromAddr(process, (DWORD)(stack[i]), &dwDisplacement, line);