c++ - Get Computer Name and logged user name

C++ - Get Computer Name and logged user name

In C++, you can retrieve the computer name and the logged-in user name using Windows API functions. Here's a detailed guide on how to achieve this:

Getting the Computer Name

To get the computer name, you can use the GetComputerName function from the Windows API.

Example Code:

#include <iostream> #include <Windows.h> std::string GetComputerName() { char computerName[MAX_COMPUTERNAME_LENGTH + 1]; DWORD size = sizeof(computerName) / sizeof(computerName[0]); if (GetComputerNameA(computerName, &size)) { return std::string(computerName); } else { return "Unknown"; } } int main() { std::string computerName = GetComputerName(); std::cout << "Computer Name: " << computerName << std::endl; return 0; }

Getting the Logged-In User Name

To get the logged-in user name, you can use the GetUserName function from the Windows API.

Example Code:

#include <iostream> #include <Windows.h> std::string GetUserName() { char userName[UNLEN + 1]; DWORD size = sizeof(userName); if (GetUserNameA(userName, &size)) { return std::string(userName); } else { return "Unknown"; } } int main() { std::string userName = GetUserName(); std::cout << "User Name: " << userName << std::endl; return 0; }

Combined Example

Here's a combined example to retrieve both the computer name and the logged-in user name:

#include <iostream> #include <Windows.h> std::string GetComputerName() { char computerName[MAX_COMPUTERNAME_LENGTH + 1]; DWORD size = sizeof(computerName) / sizeof(computerName[0]); if (GetComputerNameA(computerName, &size)) { return std::string(computerName); } else { return "Unknown"; } } std::string GetUserName() { char userName[UNLEN + 1]; DWORD size = sizeof(userName); if (GetUserNameA(userName, &size)) { return std::string(userName); } else { return "Unknown"; } } int main() { std::string computerName = GetComputerName(); std::string userName = GetUserName(); std::cout << "Computer Name: " << computerName << std::endl; std::cout << "User Name: " << userName << std::endl; return 0; }

Explanation

  • GetComputerName:

    • Retrieves the NetBIOS name of the local computer.
    • MAX_COMPUTERNAME_LENGTH defines the maximum length of the computer name.
    • GetComputerNameA is used for ANSI strings, while GetComputerNameW is used for wide (Unicode) strings.

  • GetUserName:

    • Retrieves the user name of the user currently logged on to the local system.
    • UNLEN defines the maximum length of the user name.
    • GetUserNameA is used for ANSI strings, while GetUserNameW is used for wide (Unicode) strings.

Ensure you include <Windows.h> and link against the appropriate libraries for these functions to work.

This approach provides a straightforward way to access system information using the Windows API in C++.

Examples

  1. "How to get the computer name in C++"

    Description: Retrieve the computer name using the GetComputerName function from the Windows API.

    Code:

    #include <windows.h> #include <iostream> int main() { char computerName[MAX_COMPUTERNAME_LENGTH + 1]; DWORD size = sizeof(computerName); if (GetComputerName(computerName, &size)) { std::cout << "Computer Name: " << computerName << std::endl; } else { std::cerr << "Failed to get computer name." << std::endl; } return 0; }

  2. "How to get the logged-in user name in C++"

    Description: Retrieve the logged-in user's name using the GetUserName function from the Windows API.

    Code:

    #include <windows.h> #include <lmcons.h> #include <iostream> int main() { char userName[UNLEN + 1]; DWORD size = sizeof(userName); if (GetUserName(userName, &size)) { std::cout << "Logged-in User Name: " << userName << std::endl; } else { std::cerr << "Failed to get user name." << std::endl; } return 0; }

  3. "Get computer name and user name using C++ on Windows"

    Description: Combine both GetComputerName and GetUserName to get both computer and user names.

    Code:

    #include <windows.h> #include <lmcons.h> #include <iostream> int main() { char computerName[MAX_COMPUTERNAME_LENGTH + 1]; char userName[UNLEN + 1]; DWORD computerNameSize = sizeof(computerName); DWORD userNameSize = sizeof(userName); if (GetComputerName(computerName, &computerNameSize) && GetUserName(userName, &userNameSize)) { std::cout << "Computer Name: " << computerName << std::endl; std::cout << "Logged-in User Name: " << userName << std::endl; } else { std::cerr << "Failed to get computer or user name." << std::endl; } return 0; }

  4. "How to get computer name and logged-in user name in C++ using WMI"

    Description: Use Windows Management Instrumentation (WMI) to get the computer name and logged-in user.

    Code:

    #include <iostream> #include <comdef.h> #include <Wbemidl.h> #pragma comment(lib, "wbemuuid.lib") int main() { HRESULT hres; hres = CoInitializeEx(0, COINIT_MULTITHREADED); if (FAILED(hres)) { std::cerr << "Failed to initialize COM library." << std::endl; return 1; } hres = CoInitializeSecurity(NULL, -1, NULL, NULL, RPC_C_AUTHN_LEVEL_DEFAULT, RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE, NULL); if (FAILED(hres)) { std::cerr << "Failed to initialize security." << std::endl; CoUninitialize(); return 1; } IWbemLocator *pLoc = NULL; hres = CoCreateInstance(CLSID_WbemLocator, 0, CLSCTX_INPROC_SERVER, IID_IWbemLocator, (LPVOID *)&pLoc); if (FAILED(hres)) { std::cerr << "Failed to create IWbemLocator object." << std::endl; CoUninitialize(); return 1; } IWbemServices *pSvc = NULL; hres = pLoc->ConnectServer(_bstr_t(L"ROOT\\CIMV2"), NULL, NULL, NULL, WBEM_CONNECT_USE_MAX_WAIT, NULL, NULL, &pSvc); if (FAILED(hres)) { std::cerr << "Could not connect." << std::endl; pLoc->Release(); CoUninitialize(); return 1; } hres = CoSetProxyBlanket(pSvc, RPC_C_AUTHN_WINNT, RPC_C_AUTHZ_NONE, NULL, RPC_C_AUTHN_LEVEL_CALL, RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE); if (FAILED(hres)) { std::cerr << "Could not set proxy blanket." << std::endl; pSvc->Release(); pLoc->Release(); CoUninitialize(); return 1; } IEnumWbemClassObject* pEnumerator = NULL; hres = pSvc->ExecQuery(bstr_t("WQL"), bstr_t("SELECT * FROM Win32_ComputerSystem"), WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, NULL, &pEnumerator); if (FAILED(hres)) { std::cerr << "Query for computer name failed." << std::endl; pSvc->Release(); pLoc->Release(); CoUninitialize(); return 1; } IWbemClassObject *pclsObj = NULL; ULONG uReturn = 0; while (pEnumerator) { HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1, &pclsObj, &uReturn); if (0 == uReturn) { break; } VARIANT vtProp; pclsObj->Get(L"Name", 0, &vtProp, 0, 0); std::wcout << "Computer Name : " << vtProp.bstrVal << std::endl; VariantClear(&vtProp); pclsObj->Release(); } pSvc->Release(); pLoc->Release(); CoUninitialize(); return 0; }

  5. "How to get computer and user names using C++ with GetComputerNameEx"

    Description: Use GetComputerNameEx to get extended information about the computer name.

    Code:

    #include <windows.h> #include <iostream> int main() { char computerName[MAX_COMPUTERNAME_LENGTH + 1]; DWORD size = sizeof(computerName); if (GetComputerNameEx(ComputerNameDnsFullyQualified, computerName, &size)) { std::cout << "Fully Qualified Computer Name: " << computerName << std::endl; } else { std::cerr << "Failed to get computer name." << std::endl; } return 0; }

  6. "Get the computer name and current user in C++ with error handling"

    Description: Implement error handling while retrieving computer and user names.

    Code:

    #include <windows.h> #include <lmcons.h> #include <iostream> int main() { char computerName[MAX_COMPUTERNAME_LENGTH + 1]; char userName[UNLEN + 1]; DWORD computerNameSize = sizeof(computerName); DWORD userNameSize = sizeof(userName); if (!GetComputerName(computerName, &computerNameSize)) { std::cerr << "Error getting computer name: " << GetLastError() << std::endl; return 1; } if (!GetUserName(userName, &userNameSize)) { std::cerr << "Error getting user name: " << GetLastError() << std::endl; return 1; } std::cout << "Computer Name: " << computerName << std::endl; std::cout << "Logged-in User Name: " << userName << std::endl; return 0; }

  7. "Retrieve computer and logged-in user information with Windows API in C++"

    Description: Use Windows API functions to get computer and user names and handle errors.

    Code:

    #include <windows.h> #include <lmcons.h> #include <iostream> int main() { char computerName[MAX_COMPUTERNAME_LENGTH + 1]; char userName[UNLEN + 1]; DWORD computerNameSize = sizeof(computerName); DWORD userNameSize = sizeof(userName); if (!GetComputerName(computerName, &computerNameSize)) { std::cerr << "Failed to get computer name." << std::endl; } if (!GetUserName(userName, &userNameSize)) { std::cerr << "Failed to get user name." << std::endl; } std::cout << "Computer Name: " << computerName << std::endl; std::cout << "User Name: " << userName << std::endl; return 0; }

  8. "How to get machine and logged-in user names with GetComputerName and GetUserName in C++"

    Description: Demonstrate using both functions for combined information.

    Code:

    #include <windows.h> #include <lmcons.h> #include <iostream> int main() { char computerName[MAX_COMPUTERNAME_LENGTH + 1]; char userName[UNLEN + 1]; DWORD computerNameSize = sizeof(computerName); DWORD userNameSize = sizeof(userName); if (GetComputerName(computerName, &computerNameSize) && GetUserName(userName, &userNameSize)) { std::cout << "Computer Name: " << computerName << std::endl; std::cout << "User Name: " << userName << std::endl; } else { std::cerr << "Error retrieving information." << std::endl; } return 0; }

  9. "Combine GetComputerName and GetUserName for system information in C++"

    Description: Combine results from both API calls to get system details.

    Code:

    #include <windows.h> #include <lmcons.h> #include <iostream> int main() { char computerName[MAX_COMPUTERNAME_LENGTH + 1]; char userName[UNLEN + 1]; DWORD computerNameSize = sizeof(computerName); DWORD userNameSize = sizeof(userName); if (GetComputerName(computerName, &computerNameSize)) { std::cout << "Computer Name: " << computerName << std::endl; } else { std::cerr << "Failed to get computer name." << std::endl; } if (GetUserName(userName, &userNameSize)) { std::cout << "User Name: " << userName << std::endl; } else { std::cerr << "Failed to get user name." << std::endl; } return 0; }

  10. "Fetch computer and logged-in user names in C++ with Windows API"

    Description: Fetch both computer and user names using Windows API calls.

    Code:

    #include <windows.h> #include <lmcons.h> #include <iostream> int main() { char computerName[MAX_COMPUTERNAME_LENGTH + 1]; char userName[UNLEN + 1]; DWORD computerNameSize = sizeof(computerName); DWORD userNameSize = sizeof(userName); if (GetComputerName(computerName, &computerNameSize)) { std::cout << "Computer Name: " << computerName << std::endl; } else { std::cerr << "Error retrieving computer name." << std::endl; } if (GetUserName(userName, &userNameSize)) { std::cout << "Logged-in User Name: " << userName << std::endl; } else { std::cerr << "Error retrieving user name." << std::endl; } return 0; }

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