netapi32.dll是Windows網絡應用程序接口，用于支持訪問微軟網絡。

先看代碼；

#include <windows.h> #include <assert.h> #include <lm.h> #include "resource.h"//#pragma comment(lib,"Y:\\xxx\\cfreePrj\\userdemo2\\mingw5\\NETAPI32.LIB")LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM); int ListUsers(LPWSTR, HDC );HINSTANCE hInst; TCHAR szClassName[] = TEXT("userDemo"); char errBuffer[100]; char szBuffer[100];int WINAPI WinMain (HINSTANCE hThisInstance,HINSTANCE hPrevInstance,LPSTR lpszArgument,int nFunsterStil) {HWND hwnd;MSG messages;WNDCLASSEX wincl;hInst = hThisInstance;wincl.hInstance = hThisInstance;wincl.lpszClassName = szClassName;wincl.lpfnWndProc = WindowProcedure;wincl.style = CS_DBLCLKS;wincl.cbSize = sizeof (WNDCLASSEX);wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);wincl.hCursor = LoadCursor (NULL, IDC_ARROW);wincl.lpszMenuName = MAKEINTRESOURCE (IDC_USERDEMO1);wincl.cbClsExtra = 0;wincl.cbWndExtra = 0;wincl.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);if (!RegisterClassEx (&wincl))return 0;hwnd = CreateWindowEx (0,szClassName,TEXT("userDemo"),WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,200,200,HWND_DESKTOP,NULL,hThisInstance,NULL);ShowWindow (hwnd, nFunsterStil);while (GetMessage (&messages, NULL, 0, 0)){TranslateMessage(&messages);DispatchMessage(&messages);}return messages.wParam; }LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {PAINTSTRUCT ps;HDC hdc;RECT rt;int ret;switch (message){case WM_COMMAND:switch (LOWORD(wParam)){case IDM_ABOUT:MessageBox (hwnd, TEXT ("userDemo v1.0\nCopyright (C) 2020\n by bo"),TEXT ("userDemo"), MB_OK | MB_ICONINFORMATION);break;case IDM_EXIT:DestroyWindow(hwnd);break;default:return DefWindowProc(hwnd, message, wParam, lParam); }break;case WM_PAINT:hdc = BeginPaint(hwnd, &ps); GetClientRect(hwnd, &rt); ret=ListUsers(NULL, hdc); EndPaint(hwnd, &ps);break;case WM_DESTROY:PostQuitMessage (0);break;default:return DefWindowProc (hwnd, message, wParam, lParam);}return 0; }/************************************* * 功能 列舉用戶 * 參數 szServerName，主機名，如果為本機設置為NULL **************************************/ int ListUsers(LPWSTR pszServerName, HDC hdc) {LPUSER_INFO_0 pBuf = NULL;LPUSER_INFO_0 pTmpBuf;DWORD dwLevel = 0;DWORD dwPrefMaxLen = MAX_PREFERRED_LENGTH;DWORD dwEntriesRead = 0;DWORD dwTotalEntries = 0;DWORD dwResumeHandle = 0;DWORD i;DWORD dwTotalCount = 0;NET_API_STATUS nStatus;//pBuf=(LPUSER_INFO_0)VirtualAlloc(NULL,MAX_PREFERRED_LENGTH,MEM_COMMIT|MEM_RESERVE,PAGE_READWRITE);// 循環，直到可以成功調用 NetUserEnumdo {// 調用NetUserEnum函數nStatus = NetUserEnum(pszServerName,dwLevel,// 這里設置為0，使用 LPUSER_INFO_0 返回結果FILTER_NORMAL_ACCOUNT, // 只列舉正常類型的用戶(LPBYTE*)&pBuf,// LPUSER_INFO_0 保存返回結果// MAX_PREFERRED_LENGTH，內存由API分配，需要在之后調用NetApiBufferFree釋放dwPrefMaxLen,&dwEntriesRead,// 讀了的 Entries&dwTotalEntries,// 一共的 Entries&dwResumeHandle);if ((nStatus == NERR_Success) || (nStatus == ERROR_MORE_DATA)){if ((pTmpBuf = pBuf) != NULL){for (i = 0; (i < dwEntriesRead); i++)// 循環讀取用戶信息{assert(pTmpBuf != NULL);if (pTmpBuf == NULL){MessageBox(NULL,"An access violation has occurred\n",TEXT("列舉用戶"),0);break;}// 輸出wsprintf(szBuffer, "%s", pTmpBuf->usri0_name);TextOut(hdc, 20, 20+i*30, szBuffer, lstrlen(szBuffer));// 下一個pTmpBuf++;dwTotalCount++;}}}elsewsprintf(errBuffer, "A system error has occurred: %d\n",nStatus);MessageBox(NULL,errBuffer,TEXT("列舉用戶"),0);// 釋放內存if (pBuf != NULL){NetApiBufferFree(pBuf);pBuf = NULL;}}while (nStatus == ERROR_MORE_DATA); // end do// 釋放內存if (pBuf != NULL)NetApiBufferFree(pBuf);wsprintf(szBuffer, "總數 of users：%d\n\n",dwTotalCount);MessageBox(NULL,szBuffer,TEXT("列舉用戶"),0);return 0; }

運行；

獲取到2個用戶；只輸出了用戶名第一個字母；

pBuf可能要預先分配內存；

命令行用 net user 查看，用戶如下；代碼還有問題，有時間再看；

在CFree里，工程設置，如下圖，找到NETAPI32.lib，加入進來；然后把路徑名和文件后綴，都去掉；才能構建成功；

如果包含lib后綴名；會報類似如下；

[Error] C:\PROGRA~2\C-FREE~1\mingw\bin\ld.exe: cannot find -lNETAPI32.lib

這個好像是g++編譯器，不太認識lib文件；

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還不清楚lib和dll是拷貝到源碼或者構建目錄，都拷一下；構建出exe的目錄是mingw5；

沒有netapi32.dll和lib的話，網上單獨下；

為了在列舉函數里面在窗口上輸出，傳遞 HDC hdc 參數過來；

添加了資源后如下；

resource.h和.rc文件文件類似此文；

https://blog.csdn.net/bcbobo21cn/article/details/106143664

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