Question

以下代码产生运行时错误：

窗口文件Search.exe中0x773315de处的未处理异常：0xC0000005：访问冲突。

我不知道是什么导致了它。你能指出我的错误吗？

这是可能包含罪魁祸首的函数：

int fileSearcher::findFilesRecursivelly(const TCHAR* curDir,const TCHAR* fileName,bool caseSensitive,TCHAR* output)
{
    HANDLE hFoundFile;
    WIN32_FIND_DATA foundFileData;

    TCHAR nextDirBuffer[MAX_PATH]=TEXT("");

    SetCurrentDirectory(curDir);
    //Fetch inside current directory
    hFoundFile = FindFirstFileEx(fileName,FINDEX_INFO_LEVELS::FindExInfoBasic,&foundFileData ,FINDEX_SEARCH_OPS::FindExSearchNameMatch ,NULL , FIND_FIRST_EX_LARGE_FETCH);

    if(hFoundFile != INVALID_HANDLE_VALUE)
    {       
        do
        {
            nothingFound = false;

            wcscat(output,curDir);
            wcscat(output,TEXT("\\"));
            wcscat(output,foundFileData.cFileName);
            wcscat(output,TEXT("\n"));
        }   
        while(FindNextFile(hFoundFile,&foundFileData));
    }

    //Go to the subdirs
    hFoundFile = FindFirstFileEx(TEXT("*"),FINDEX_INFO_LEVELS::FindExInfoBasic,&foundFileData ,FINDEX_SEARCH_OPS::FindExSearchLimitToDirectories ,NULL , FIND_FIRST_EX_LARGE_FETCH); //This line of code was on the call stack

    if(hFoundFile != INVALID_HANDLE_VALUE)
    {
        do
        {
            wcscat(nextDirBuffer,curDir);
            wcscat(nextDirBuffer,TEXT("\\"));
            wcscat(nextDirBuffer,foundFileData.cFileName);
            findFilesRecursivelly(nextDirBuffer,fileName,caseSensitive,outputBuffer);
        }
        while(FindNextFile(hFoundFile,&foundFileData));
    } 

    return 0;

}

不太重要的代码：

File Search.h

#ifndef UNICODE
#define UNICODE
#endif

#include <Windows.h>

namespace fileSearch
{
class fileSearcher
{
public: 
    fileSearcher();

    void getAllPaths(const TCHAR* fileName,bool caseSensitive,TCHAR* output);   
    /*Returns all matching pathes at the current local system. Format:
    [A-Z]:\[FirstPath\foo1...\fileName]
    [A-Z]:\[SecondPath\foo2...\fileName]
    [A-Z]:\[ThirdPath\foo3...\fileName]
    ...
    [A-Z]:\[FourthPath\foo4...\fileName]
    Also an asterisk sign is supported, as in regular expressions.

    This functions uses WinApi methods.
    */

    int findFilesRecursivelly(const TCHAR* curDir,const TCHAR* fileName,bool caseSensitive,TCHAR* output);
    //Searches for the file in the current and in sub directories. NOT IN PARENT!!!!!!!!!!!!!!!!!!!!! Returns true if the file is found.

private:
    static const int MAX_NUMBER_OF_FILES = 100;
    static const int MAX_OUTPUT_SIZE = 2000;

    bool nothingFound;

    TCHAR outputBuffer[MAX_OUTPUT_SIZE];
};
}

...和FileSeach.cpp的其余部分

#ifndef UNICODE
#define UNICODE
#endif

#include "File Search.h"

using namespace fileSearch;

fileSearcher::fileSearcher()
{
    nothingFound = true;
}

void fileSearcher::getAllPaths(const TCHAR* fileName,bool caseSensitive, TCHAR* output)
{
    TCHAR localDrives[50];
    TCHAR currentDrive;
    int voluminesChecked=0;

    TCHAR searchedVolumine[5];


    GetLogicalDriveStrings(sizeof(localDrives)/sizeof(TCHAR),localDrives);

    //For all drives:
    for(int i=0; i < sizeof(localDrives)/sizeof(TCHAR); i++)
    {       
            if(localDrives[i] >= 65 && localDrives[i] <= 90)
            {   
                currentDrive = localDrives[i];
                voluminesChecked++;
            }
            else continue;



    searchedVolumine[0] = currentDrive;
    searchedVolumine[1] = L':';
    searchedVolumine[2] = 0;



    outputBuffer[0]=0;
    findFilesRecursivelly(searchedVolumine,fileName,caseSensitive,outputBuffer);

    (nothingFound) ? wcscpy(output,L"File not found") : wcscpy(output,outputBuffer);

    }

}

修改

一些迭代后curDir的值是 -

 +        curDir  0x003df234 "C:\.\$Recycle.Bin\.\.\.\.\.\.\.\.\.\.\.\.\.\.\.\.\.\.\.\.\.\.\.\.\.\.\.\."  const wchar_t *

但我不知道为什么。

Answer 1

看起来缓冲区溢出。在通过目录树递归时，您忘记每个目录都包含对它自己的引用（名称为'。'）以及对它的父目录的引用（名称为'..'），您必须从递归中排除这些引用。这样做

    do
    {
        if (wcscmp(foundFileData.cFileName, TEXT(".") == 0 ||
            wcscmp(foundFileData.cFileName, TEXT("..") == 0)
        {
            continue;
        }
        wcscat(nextDirBuffer,curDir);
        wcscat(nextDirBuffer,TEXT("\\"));
        wcscat(nextDirBuffer,foundFileData.cFileName);
        findFilesRecursivelly(nextDirBuffer,fileName,caseSensitive,outputBuffer);
    }
    while(FindNextFile(hFoundFile,&foundFileData));

您编码它的方式只是在同一目录中循环和循环。

Answer 2

每个非根目录都包含自身（“。”）及其父（“..”）。您需要明确地从递归搜索中排除这些：

if (wcscmp(foundFileData.cFileName, L".") != 0 
     && wcscmp(foundFileData.cFileName, L"..") != 0) 
{
  wcscat(nextDirBuffer,curDir);
  wcscat(nextDirBuffer,TEXT("\\"));
  wcscat(nextDirBuffer,foundFileData.cFileName);
  findFilesRecursivelly(nextDirBuffer,fileName,caseSensitive,outputBuffer);
}

使用扩展功能在整个系统中搜索文件

2 个答案: