Thread: Recursive FTP directory exploration using Wininet

Originally Posted by Niara

Then how to do it with recursion?

Finish current folder - fill list of names of subfolders

Only after no more folders in the current folder is found - Call your function for each found subfolder

Hay it works, now I can go on with my program. Here's the result:

Code:

int conta_arxius(HINTERNET hCon,char *dir_treball)
{
int inc,ctd=0,q;
struct _ARRAY *dirs,*ptr;
HINTERNET hf;
WIN32_FIND_DATA fd;
char bff[2048];

padding++;
if(!(hf=FtpFindFirstFile(hCon,NULL,&fd,0,0)))
    {
    ctd=-1;
    printf("Error FindFirstFile: ");
    printf_error();
    goto finalitza;
    }

dirs=NULL;
do
    {
    if(fd.dwFileAttributes==FILE_ATTRIBUTE_DIRECTORY)
        {
        array_add(&dirs,fd.cFileName);
        }
    else
        {
        printf_pad();
        printf("%s\n",fd.cFileName);
        ctd++;
        }
    } while(InternetFindNextFile(hf,&fd));
InternetCloseHandle(hf);
hf=NULL;

for(q=0;q<array_length(dirs);q++)
    {
    if((ptr=array_get(dirs,q)))
        {
        sprintf(bff,"%s",dir_treball);
        backslash(bff);
        strcat(bff,ptr->data);
        
        printf("Selecciona %s\n",bff);
        if(!FtpSetCurrentDirectory(hCon,bff))
            {
            ctd=-1;
            printf("Error SetCurrentDirectori: ");
            printf_error();
            goto finalitza;
            }
        
        printf_pad();
        printf("Explora %s\n",bff);
        if((inc=conta_arxius(hCon,bff))<0)
            {
            ctd=-1;
            printf_error();
            goto finalitza;
            }
        
        printf("Retorna a %s\n",dir_treball);
        if(!FtpSetCurrentDirectory(hCon,dir_treball))
            {
            ctd=-1;
            printf("Error SetCurrentDirectori: ");
            printf_error();
            goto finalitza;
            }

        ctd+=inc;
        }
    }

finalitza:
array_reset(dirs);
padding--;
return ctd;
}

The list _ARRAY is a simple linked list, the other functions are the same as in my first post.

Thank's vart for your help
Niara

This is a little patcher program that I made. Have fun with it. It will connect to the ftp server and recursively go through each directory and download files if the ones on the server are newer than the ones located on the clients hard drive.

Feel free to modify any part and use it as you wish.. Good Luck

Code:

#include "stdafx.h"
#include <windows.h>
#include <wininet.h>
#include <iostream>
#include <list>
#include <string>
#include <stdlib.h> 
#include <fstream>
#pragma comment(lib, "wininet.lib")
#pragma comment(lib, "user32.lib")

using namespace std;

void StartClient();
void GetFiles(HINTERNET &hConnnect);
void ListDirectory(HINTERNET &hConnnect);
bool FindFile(HINTERNET &hConnect, HINTERNET &hFind, LPCWSTR temp, WIN32_FIND_DATA &SdirInfo);
wchar_t relative[MAX_PATH];
size_t relativesize;


int _tmain(int argc, _TCHAR* argv[])
{
	/*
	if(RunDirectx){
		STARTUPINFO sj;
		PROCESS_INFORMATION pj;
		memset(&sj, 0, sizeof(sj));
		sj.cb = sizeof(sj);
		ZeroMemory( &pj, sizeof(pj) );
		// Start the child process p1.exe. Make sure p1.exe is in the
		// same folder as current application. Otherwise write the full path in first argument.
		if(!CreateProcess(L".\\directx\\DXSETUP.exe", NULL, NULL, NULL, FALSE, 0, NULL, NULL, &sj, &pj)){
			printf( "CreateProcess failed (%d)\n", GetLastError() );
		}
		// Wait until child processes exit.
		WaitForSingleObject( pj.hProcess, INFINITE );
		// Close process and thread handles.
		CloseHandle( pj.hProcess );
		CloseHandle( pj.hThread );
	}
	*/
	HINTERNET hInternet = InternetOpen(L"Patcher", INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);
	DWORD err;
	if (hInternet == NULL){
		err=GetLastError();
		cout<<"Internet Connection Not Detected. If you are connected, please notify [email protected] with this error number:"<<err<<endl;
		InternetCloseHandle(hInternet);
        return 0;
    }
	cout<<"Internet Connectioned Detected..."<<endl;
	HINTERNET hConnect = InternetConnect(hInternet, L"nolimitsdesigns.com", INTERNET_DEFAULT_FTP_PORT, L"[email protected]", NULL, INTERNET_SERVICE_FTP, 0, 0);
	if (hConnect == NULL){
		err=GetLastError();
		cout<<"Cannot Connect to the ftp server. please notify [email protected] with this error number:"<<err<<endl;
		InternetCloseHandle(hConnect);
		InternetCloseHandle(hInternet);
        return 0;
    }
	cout<<"Successfully connected to the ftp server.."<<endl;
	relativesize =GetCurrentDirectory(MAX_PATH, relative);
	if(relativesize==0){
		cout<<"error calling GetCurrentDirectory"<<endl;
	} else {
		relativesize*=sizeof(wchar_t);// i do not want the null char at the end
		wcout<<"Current relative Client Directory set to: "<<relative<<endl<<"  Lenght of Directory is: "<<relativesize<<endl;
	}
	cout<<"Beginning search for files... Please wait"<<endl;
	GetFiles(hConnect);
	InternetCloseHandle(hInternet);
	InternetCloseHandle(hConnect);
	
	cout<<"Continue to load client (Y/N)?:";
	char k;
	cin>>k;
	if(k=='y' || k=='Y'){
		StartClient();
	}
	return 0;
}
void StartClient(){
	system("Client.exe");
	cout<<"Starting Client..";
}
void GetFiles(HINTERNET &hConnect){
	WIN32_FIND_DATA SdirInfo;
	HINTERNET       hFind;
	DWORD           err;
	size_t CurDirSize(0);// the number of bytes in array.. not the string lenght
	wchar_t CurDir[MAX_PATH], ServDir[MAX_PATH];// servDir is the servers directory, curdir is the client
	DWORD pt(MAX_PATH);
	if(FtpGetCurrentDirectory(hConnect, CurDir, &pt)){
		CurDirSize=wcsnlen(CurDir, MAX_PATH)*sizeof(wchar_t);// i do not want the null char at the end
		memcpy(ServDir, CurDir, CurDirSize*sizeof(wchar_t));// make a copy before we modify
		for(size_t i(0); i!=CurDirSize; i++){
			if(CurDir[i]==47){// using ascii numbers because I am cool like that!
				CurDir[i]=92;
			}
		}
		wcout<<"Current Server Directory is: "<<ServDir<<endl<<"Lenght of Directory is:"<<CurDirSize<<endl;
		if(!SetCurrentDirectory(relative)){
			wcout<<"Failed to SetCurrentDirectory on the client to"<<relative<<endl;
		} else {
			wcout<<"SetCurrentDirectory on the client to"<<relative<<endl;
		}
		if(CurDirSize>2){// if we should change directories.. then do it
			wchar_t newdir[MAX_PATH];
			memcpy(newdir, relative, relativesize);
			size_t beg(relativesize/sizeof(wchar_t));
			size_t end(beg + (CurDirSize/sizeof(wchar_t)));
			for( size_t i(0); beg!=end; beg++){
				newdir[beg]=CurDir[i++];
			}
			newdir[end]=0;// add the null char
			if(!CreateDirectory(newdir, NULL)){
					err = GetLastError( );
					if(err==ERROR_ALREADY_EXISTS){
						wcout<<"Directory: "<<newdir<<"   Exists, continuing search."<<endl;
					} else{
						wcout<<"Bad error calling CreateDirectory on: "<<newdir<<endl;
						return;
					}
			} else {
				wcout<<"Created the directory: "<<newdir<<endl;
			}
			if(!SetCurrentDirectory(newdir)){
				wcout<<"Failed to SetCurrentDirectory on the client to"<<newdir<<endl;
			}
		}// else skip this.. its the first directory / 
	} else {
		err = GetLastError( );
		cout<<"Error calling get directory... "<<err<<endl;
		return;
	}
	ListDirectory(hConnect);
	hFind = FtpFindFirstFile( hConnect, NULL, &SdirInfo, INTERNET_FLAG_DONT_CACHE, 0 );
	if ( hFind == NULL ){
		err = GetLastError( );
		if( err == ERROR_NO_MORE_FILES ){
			cout<<"End of Directory listing"<<endl;
		} else {
			cout<<"FtpFindFirstFile Failed "<<err<<endl;
		}
		return;// done listing the directory get out
	}
	if(SdirInfo.cFileName[0]==46){// we are working on periods!! ewwww, I need a tampon
		InternetFindNextFile( hFind, (LPVOID) &SdirInfo );
	}
	for( ; InternetFindNextFile( hFind, (LPVOID) &SdirInfo ); ){
		if( SdirInfo.dwFileAttributes==FILE_ATTRIBUTE_DIRECTORY){
			if(wcscmp(SdirInfo.cFileName , L"incoming")==0){// skip the file
				continue;
			}
			wcout<<"Attempting to change directories on the ftp server to: "<<SdirInfo.cFileName<<"    ....";
			if(FtpSetCurrentDirectory(hConnect, SdirInfo.cFileName)){
				cout<<"Succesful"<<endl;
				InternetCloseHandle(hFind);
				GetFiles(hConnect);// recursive function to search through all directories
				wcout<<"Resuming search .. Attempting to change directories on the ftp server to: "<<ServDir<<"    ....";;
				if(FtpSetCurrentDirectory(hConnect, ServDir)){ // resuming the search, change directories back
					cout<<"Success"<<endl;
					wchar_t newdir[MAX_PATH];
					memcpy(newdir, relative, relativesize);
					size_t beg(relativesize/sizeof(wchar_t));
					size_t end(beg + (CurDirSize/sizeof(wchar_t)));
					for( size_t i(0); beg!=end; beg++){
						newdir[beg]=CurDir[i++];
					}
					newdir[end]=0;// add the null char
					if(!SetCurrentDirectory(newdir)){
						wcout<<"Failed to SetCurrentDirectory on the client to"<<newdir<<endl;
					} else {
						wcout<<"SetCurrentDirectory on the client to"<<newdir<<endl;
					}
					ListDirectory(hConnect);
					wchar_t temp[MAX_PATH];
					size_t q(0);
					do{
						temp[q]=SdirInfo.cFileName[q];
					}while(SdirInfo.cFileName[q++]!=0);
					temp[q]=0;// add null char
					if(!FindFile(hConnect, hFind, temp, SdirInfo)){
						return;// cannot find the file, something is really wrong. Get out now!
					} else {
						continue;
					}
				} else {
					err = GetLastError( );
					wchar_t see[MAX_PATH];
					DWORD wer(0), msd(MAX_PATH);
					if(InternetGetLastResponseInfo(&wer, see, &msd)){
						wcout<<"Error "<<see<<endl;
					}
					cout<<"Failed "<<err;
				}
			} else {
				err = GetLastError( );
				wchar_t see[MAX_PATH];
				DWORD wer(0), msd(MAX_PATH);
				if(InternetGetLastResponseInfo(&wer, see, &msd)){
					wcout<<"Error "<<see<<endl;
				}
				cout<<"Failed"<<err;
				return;
			}
		} else {// we are deadling with files, not directories
			if(wcscmp(SdirInfo.cFileName , L".ftpquota")==0){// skip the file
				continue;
			}
			WIN32_FIND_DATA tfile;
			HANDLE t = FindFirstFile(SdirInfo.cFileName, &tfile);// this is the file on the local drive
			SYSTEMTIME ltime, stime;
			FileTimeToSystemTime(&tfile.ftLastWriteTime, &ltime);
			FileTimeToSystemTime(&SdirInfo.ftLastWriteTime, &stime); 
			if(t!=INVALID_HANDLE_VALUE){// we have the file 
				wcout<<"File "<<tfile.cFileName<<" found on hard drive. Checking to see if this matches the file on the server...";
				if(tfile.nFileSizeLow == SdirInfo.nFileSizeLow && ltime.wYear >= stime.wYear){// we might have the same file... do better check
					if(ltime.wMonth > stime.wMonth){// update-to-date file..... continue
						cout<<" Same file found. Continuing to next."<<endl;
						continue;
					} else if(ltime.wMonth == stime.wMonth){// check date
						if(ltime.wDay >= stime.wDay){
							cout<<" Same file found. Continuing to next."<<endl;
							continue;
						}// else we need to update... download
					}// else the file has a month less than the servers.... download file
				}  
			}
			wcout<<"File: "<<SdirInfo.cFileName<<"  Does not exist. Downloading file from the server .."<<endl;
			FtpGetFile(hConnect, SdirInfo.cFileName, SdirInfo.cFileName, false, FILE_ATTRIBUTE_NORMAL, FTP_TRANSFER_TYPE_BINARY, 0);
		}
	} 
	cout<<"End of Directory listing"<<endl;
	InternetCloseHandle(hFind);
}
void ListDirectory(HINTERNET &hConnect){
	WIN32_FIND_DATA SdirInfo;
	HINTERNET       hFind;
	DWORD           err;
	cout<<"Listing Server Directory..."<<endl;
	hFind = FtpFindFirstFile( hConnect, NULL, &SdirInfo, INTERNET_FLAG_DONT_CACHE, 0 );
	if ( hFind == NULL ){
		err = GetLastError( );
		if( err == ERROR_NO_MORE_FILES ){
			cout<<"End of Directory listing"<<endl;
		} else {
			cout<<"FtpFindFirstFile Failed "<<err<<endl;
		}
		return;// done listing the directory get out
	}
	wcout<<SdirInfo.cFileName<<endl;
	for( ; InternetFindNextFile( hFind, (LPVOID) &SdirInfo ); ){
		wcout<<SdirInfo.cFileName<<endl;
	}
	InternetCloseHandle(hFind);
}
bool FindFile(HINTERNET &hConnect, HINTERNET &hFind, LPCWSTR temp, WIN32_FIND_DATA &SdirInfo){
	DWORD           err;
	wcout<<"Finding the file "<<temp<<endl;
	hFind = FtpFindFirstFile( hConnect, NULL, &SdirInfo, INTERNET_FLAG_DONT_CACHE, 0 );
	if ( hFind == NULL ){
		err = GetLastError( );
		if( err == ERROR_NO_MORE_FILES ){
			cout<<"End of Directory listing"<<endl;
		} else {
			cout<<"FtpFindFirstFile Failed "<<err<<endl;
		}
		return false;// done listing the directory get out
	}
	do{
		if(wcscmp(temp, SdirInfo.cFileName)==0){
			wcout<<"Found "<<SdirInfo.cFileName<<endl;
			return true;
		}
	}while(InternetFindNextFile( hFind, (LPVOID) &SdirInfo ));
	wcout<<"Could Not Find the File "<<temp<<endl;
	return false;
}