{"id":2626,"date":"2015-06-30T17:40:52","date_gmt":"2015-06-30T09:40:52","guid":{"rendered":"http:\/\/blog.qdac.cc\/?p=2626"},"modified":"2018-06-23T10:41:31","modified_gmt":"2018-06-23T02:41:31","slug":"%e8%8e%b7%e5%8f%96%e5%bd%93%e5%89%8d%e6%9c%ba%e5%99%a8%e4%b8%8a%e9%a6%96%e4%b8%aa%e6%9c%aa%e4%bd%bf%e7%94%a8%e7%9a%84-tcp-%e7%ab%af%e5%8f%a3","status":"publish","type":"post","link":"https:\/\/blog.qdac.cc\/?p=2626","title":{"rendered":"\u83b7\u53d6\u5f53\u524d\u673a\u5668\u4e0a\u9996\u4e2a\u672a\u4f7f\u7528\u7684 TCP \u7aef\u53e3"},"content":{"rendered":"<p>\u8fd9\u4e2a\u51fd\u6570\u7528\u4e8e\u83b7\u53d6\u8ba1\u7b97\u673a\u4e0a\u9996\u4e2a\u672a\u4f7f\u7528\u7684 TCP \u7aef\u53e3\u4ee5\u4fbf\u7a0b\u5e8f\u4f7f\u7528\u3002\u6709\u65f6\u5019\u6211\u4eec\u5e76\u4e0d\u9700\u8981\u4e00\u4e2a\u56fa\u5b9a\u7684\u7aef\u53e3\u6765\u63d0\u4f9b\u670d\u52a1\uff0c\u901a\u8fc7\u8fd9\u4e2a\u51fd\u6570\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u627e\u5230\u4e00\u4e2a\u53ef\u7528\u7684\u7aef\u53e3\u4e86\u3002\u8fd9\u4e2a\u51fd\u6570\u5982\u679c\u8fd4\u56de 0 \uff0c\u5219\u6ca1\u6709\u4efb\u4f55\u53ef\u7528\u7684\u7aef\u53e3\uff08\u51e0\u7387\u51e0\u4e4e\u4e3a 0 \u5427\uff1f\uff09\uff0c\u540c\u6837\u7684\u65b9\u6cd5\u4e5f\u53ef\u4ee5\u7528\u4e8e\u83b7\u53d6\u53ef\u7528\u7684 UDP \u7aef\u53e3\uff0c\u6362\u4e2a\u51fd\u6570\u800c\u5df2\u3002<\/p>\n<pre class=\"lang:delphi decode:true \">uses IpRtrMib, Iphlpapi, winsock;\r\n\r\nfunction GetFirstUnusedTcpPort(ADefPort: Word): Word;\r\nvar\r\n  ATables: PMIB_TCPTABLE;\r\n  ASize: DWORD;\r\n  Addr: TInAddr;\r\n  I: Integer;\r\n  AUsedPorts: array [0 .. 8191] of Byte;\r\nbegin\r\n  ASize := 0;\r\n  Result := 0; \/\/ \u65e0\u6548\r\n  if ADefPort=0 then\r\n     ADefPort:=GetCurrentProcessId;\r\n  if GetTcpTable(nil, ASize, True) = ERROR_INSUFFICIENT_BUFFER then\r\n  begin\r\n    GetMem(ATables, ASize);\r\n    try\r\n      if GetTcpTable(ATables, ASize, True) = NO_ERROR then\r\n      begin\r\n        FillChar(AUsedPorts, 8192, 0);\r\n        for I := 0 to ATables.dwNumEntries - 1 do\r\n        begin\r\n          ASize := ntohs(ATables.table[I].dwLocalPort);\r\n          AUsedPorts[ASize shr 3] := AUsedPorts[ASize shr 3] or\r\n            (1 shl (ASize and $7));\r\n        end;\r\n        for Result := ADefPort to 65535 do\r\n        begin\r\n          if (AUsedPorts[Result shr 3] and (1 shl (Result and $7))) = 0 then\r\n            Exit;\r\n        end;\r\n        for I := 1 to Result-1 do\r\n          begin\r\n          if (AUsedPorts[Result shr 3] and (1 shl (Result and $7))) = 0 then\r\n            Exit;\r\n          end;\r\n        Result:=0;\r\n      end;\r\n    finally\r\n      FreeMem(ATables);\r\n    end;\r\n  end;\r\nend;<\/pre>\n<p>\u53c2\u6570\u662f\u9ed8\u8ba4\u7684\u7aef\u53e3\u53f7\uff0c\u5982\u679c\u8fd9\u4e2a\u7aef\u53e3\u53f7\u6ca1\u88ab\u5360\u7528\uff0c\u5219\u4f1a\u88ab\u8fd4\u56de\uff0c\u5982\u679c\u88ab\u5360\u7528\u4e86\uff0c\u5219\u8fd4\u56de\u5176\u5b83\u503c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u4e2a\u51fd\u6570\u7528\u4e8e\u83b7\u53d6\u8ba1\u7b97\u673a\u4e0a\u9996\u4e2a\u672a\u4f7f\u7528\u7684 T [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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