C++批量修改文件夹下文件名

    #include <iostream>
    #include <windows.h>
    #include <stdio.h>
    using namespace std;
    
    #define MAX_PATH 999999
    
    int find_all_files(const char * lpPath)
    {
    char szFind[MAX_PATH];
    WIN32_FIND_DATA FindFileData;
    strcpy(szFind,lpPath);
    strcat(szFind,"\ *.*");
    
    cout<<szFind<<endl;
    
    HANDLE hFind=::FindFirstFile(szFind,&FindFileData);
    if(INVALID_HANDLE_VALUE == hFind)
        return -1;
    
    do
    {
        if(FindFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
        {
            if(strcmp(FindFileData.cFileName,".")!=0 && strcmp(FindFileData.cFileName, "..")!=0)
            {
                //发现子目录，递归之
                char szFile[MAX_PATH] = {0};
                strcpy(szFile,lpPath);
                strcat(szFile,"\ ");
                strcat(szFile,FindFileData.cFileName);
                find_all_files(szFile);
            }
        }
        else
        {
            //找到文件，处理之
            cout << lpPath << "\ " << FindFileData.cFileName << endl;
    
            string temporaryName = FindFileData.cFileName;
    
            string oldName(lpPath);
            oldName += "\ ";
            oldName += temporaryName;
            string newName = oldName + ".png";
            //cout<<"newName:"<<newName<<endl;
            //FindFileData.cFileName = temporaryName;
            if (rename(oldName.c_str(), newName.c_str()) == 0)
    
                //printf("Renamed %s to %s.\n", oldName, newName);
                cout<<oldName+"->"+newName+"\n";
    
            else
    
                perror("rename");
    
            //cout<<"new:"<<FindFileData.cFileName<<endl;
    
        }
    }while(::FindNextFile(hFind,&FindFileData));
    
    ::FindClose(hFind);
    
    return 0;
    }
    
    
    int main()
    {
    cout << "Hello world!" << endl;
    char *lpPath = "G:\ 123";
    find_all_files(lpPath);
    return 0;
    }