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 = ;
     CString filepath = CString(TESTPATH);
     CString FileBuffer;
     TraversFile(filepath, FileBuffer);
     printf("错误: GetModuleHandle 失败\n");
     system("pause");
     return nRetCode;
 }

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

     WIN32_FIND_DATA FindFileData = {  };
     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 >= )
     {
         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 >= )
         {
             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("\r\n");
         string csSlash = string("\\");

         WIN32_FIND_DATAA FindFileData = {  };
         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 ;
     }
 }

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