C 调用windowsAPI入门.doc

使用C#调用wind?ows API入门（一） C# 调用 DLL 导出 其实我们的议?题应该叫做C?#如何直接调用?非托管代码，通常有2种方?法： 1．? DLL 导出的函数。 2．? COM 对象上的接口?方法 我主要讨论从?dll中导出? 1．使用 C# 关键字 static? 和 extern? 声明方法。 2．将 DllImp?ort 属性附加到该?方法。DllImp?ort 属性允许您指?定包含该方法?的 DLL 的名称。 3．如果需要，为方法的参数?和返回值指定?自定义封送处?理信息，这将重写 .NET Framew?ork 的默认封送处?理。 好，我们开始 1．首先我们查询?MSDN找到?GetSho?rtPath?Name的定? The GetSho?rtPath?Name functi?on retrie?ves the short path form of the specif?ied path. DWORD GetSho?rtPath?Name( LPCTST?R lpszLo?ngPath?, LPTSTR? lpszSh?ortPat?h, DWORD cchBuf?fer ); 2．查找对照表进?行数据类型的?转换（出处：http://msdn.micros?/msdnma?g/issues?/03/07/NET/defaul?t.aspx?fig=true ）Data Types Win32 Types Specif?icatio?n CLR Type char, INT8, SBYTE, CHARa€? 8-bit signed? intege?r System?.SByte short, short int, INT16, SHORT 16-bit signed? intege?r System?.Int16 int, long, long int, INT32, LONG32?, BOOLa€?, INT 32-bit signed? intege?r System?.Int32 __int6?4, INT64, LONGLO?NG 64-bit signed? intege?r System?.Int64 unsign?ed char, UINT8, UCHARa?€?, BYTE 8-bit unsign?ed intege?r System?.Byte unsign?ed short, UINT16?, USHORT?, WORD, ATOM, WCHARa?€?, __wcha?r_t 16-bit unsign?ed intege?r System?.UInt16? unsign?ed, unsign?ed int, UINT32?, ULONG3?2, DWORD3?2, ULONG, DWORD, UINT 32-bit unsign?ed intege?r System?.UInt32? unsign?ed __int6?4, UINT64?, DWORDL?ONG, ULONGL?ONG 64-bit unsign?ed intege?r System?.UInt64? float, FLOAT Single?-precis?ion floati?ng point System?.Single? double?, long double?, DOUBLE? Double?-precis?ion floati?ng point System?.Double? a€?In Win32 this type is an intege?r with a specia?lly assign?ed meanin?g; in contra?st, the CLR provid?es a specif?ic type devote?d to this meanin?g. 3．调用GetS?hortPa?thName?这个API，简单的写法如?下（编译通过的话?）， using System?; using System?.Runtim?e.Intero?pServi?ces; public? class MSSQL_?Server?Handle?r { [DllImp?ort(kernel?32.dll)] public? static? extern? int GetSho?rtPath?Name ( string? path, String?Builde?r shortP?ath, int short