API的文件遍历，未使用CFileFind，因为里面牵扯MFC，编个DLL好麻烦。

// FindFileDebug.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include "FindFileDebug.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

#define IS_DIRECTORY(x) ((x) & (FILE_ATTRIBUTE_DIRECTORY))
#define IS_FAILED (0)

void TraversFile(CString csPath, CString & csDatabuffer);
BOOL IsDot(LPCTSTR ptStr);
using namespace std;

#define TESTPATH ("G:\Python脚本\PyCahrm项目")

int main()
{
    int nRetCode = 0;
    CString filepath = CString(TESTPATH);
    CString FileBuffer;
    TraversFile(filepath, FileBuffer);
    printf("错误: GetModuleHandle 失败
");
    system("pause");
    return nRetCode;
}


void TraversFile(CString csPath, CString & csDatabuffer)
{
    CString csPrePath = csPath;
    CString csNextPath = csPath;
    CString csNextLine = CString("
");
    CString csSlash = CString("\");

    WIN32_FIND_DATA FindFileData = { 0 };
    HANDLE hFistFind = FindFirstFile(csPath + CString("\*.*"), (LPWIN32_FIND_DATA)&FindFileData);
    if ( INVALID_HANDLE_VALUE == hFistFind)
    {
        printf("Failed to open file" );
    }
    else
    {
        wcout << FindFileData.cFileName;
    }
    do {
        if (IsDot(FindFileData.cFileName))
        {
            continue;
        }
        if (IS_DIRECTORY(FindFileData.dwFileAttributes))
        {
            csNextPath += "\";
            csNextPath += FindFileData.cFileName;
            TraversFile(csNextPath, csDatabuffer);
            csNextPath = csPrePath;
        }
        else
        {
            csDatabuffer += csNextPath + csSlash + FindFileData.cFileName + csNextLine;
            wcout << FindFileData.cFileName;
        }
    } while (FindNextFile(hFistFind, (LPWIN32_FIND_DATA)&FindFileData) != IS_FAILED);
    FindClose(hFistFind);
    hFistFind = INVALID_HANDLE_VALUE;
}

BOOL IsDot(LPCTSTR ptStr)
{
    size_t ulen = wcslen (ptStr);
    if (ulen >= 256)
    {
        return TRUE;
    }
    while (ulen--)
    {
        if (ptStr[ulen] != L'.')
        {
            return FALSE;
        }
    }
    return TRUE;
}

已适配的DLL源文件

// FileFunction20190101Dll.cpp : 定义 DLL 应用程序的导出函数。
//

#include "stdafx.h"
#include "string"
#define IS_DIRECTORY(x) ((x) & (FILE_ATTRIBUTE_DIRECTORY))
#define IS_FAILED (0)

using namespace std;

string g_csBuffer;

extern "C"
{
    BOOL IsDot(LPCSTR ptStr)
    {
        size_t ulen = strlen(ptStr);
        if (ulen >= 256)
        {
            return TRUE;
        }
        while (ulen--)
        {
            if (ptStr[ulen] != '.')
            {
                return FALSE;
            }
        }
        return TRUE;
    }
}
extern "C"      // 此处extern "c" 为解决c/c++兼容问题 
{
    _declspec(dllexport)void TraversFile(string csPath, string & csDatabuffer)
    {
        string csPrePath = csPath;
        string csNextPath = csPath;
        string csNextLine = string("
");
        string csSlash = string("\");

        WIN32_FIND_DATAA FindFileData = { 0 };
        HANDLE hFistFind = FindFirstFileA((csPath + string("\*.*")).c_str(), (LPWIN32_FIND_DATAA)&FindFileData);
        if (INVALID_HANDLE_VALUE == hFistFind)
        {
            printf("Failed to open file:%s,%s", csPath.c_str(), string("\*.*").c_str());
            return;
        }
        do {
            if (IsDot(FindFileData.cFileName))
            {
                continue;
            }
            if (IS_DIRECTORY(FindFileData.dwFileAttributes))
            {
                csNextPath += "\";
                csNextPath += FindFileData.cFileName;
                TraversFile(csNextPath, csDatabuffer);
                csNextPath = csPrePath;
            }
            else
            {
                csDatabuffer += csNextPath + csSlash + FindFileData.cFileName + csNextLine;
            }
        } while (FindNextFileA(hFistFind, (LPWIN32_FIND_DATAA)&FindFileData) != IS_FAILED);
        FindClose(hFistFind);
        hFistFind = INVALID_HANDLE_VALUE;
    }
}


extern "C"
{
    _declspec(dllexport)LPCSTR TraversFileInterface(char * pFilePath, int * pLength)
    {
        if (!g_csBuffer.empty())
        {
            g_csBuffer.clear();
        }
        string csPath = string(pFilePath);
        TraversFile(csPath, g_csBuffer);
        *pLength = g_csBuffer.length();
        
        return g_csBuffer.c_str();
    }
}

extern "C"
{
    _declspec(dllexport)unsigned int TraversFileInterfaceRelease()
    {
        g_csBuffer.clear();
        return 0;
    }
}

extern "C"
{
    _declspec(dllexport)unsigned int PrintHex(unsigned char * pData, unsigned int length)
    {
        for (unsigned int unloop = 0; unloop < length; ++unloop)
        {
            printf("%02x ", pData[unloop]);
        }
        return 0;
    }
}