NSIS 检测端口是否被占用

#include <windows.h> #include <winsock.h> #include "exdll.h" extern "C" BOOL WINAPI _DllMainCRTStartup(HANDLE hInst, ULONG ul_reason_for_call, LPVOID lpReserved) { return TRUE; } // check if the socket on the stack is free for binding on localhost extern "C" void __declspec(dllexport) CheckPort(HWND hwndParent, int string_size, char *variables, stack_t **stacktop) { // setup nsis environment EXDLL_INIT(); // get and parse port number char ports[11]; popnstring(ports,10); int port = atoi(ports); if (port <= 0 || port > 65536) { pushstring("socket_error"); return; } // start winsock WSADATA wsa_data; WORD req_version = MAKEWORD(1,1); if (WSAStartup(req_version, &wsa_data) != 0) { pushstring("winsock_error"); return; } // create and bind a socket SOCKET sock = socket(AF_INET, SOCK_STREAM, 0); if (sock == INVALID_SOCKET) { pushstring("socket_error"); return; } struct sockaddr_in server = {0}; server.sin_port = htons((unsigned short)port); server.sin_family = AF_INET; server.sin_addr.s_addr = INADDR_ANY; if (bind(sock, (struct sockaddr *)&server, sizeof server) == SOCKET_ERROR) { if (GetLastError() == WSAEADDRINUSE) { closesocket(sock); WSACleanup(); pushstring("inuse"); return; } closesocket(sock); WSACleanup(); pushstring("bind_error"); return; } closesocket(sock); WSACleanup(); pushstring("free"); return; }