请帮助：c#如何声明外部函数

Question

用Visual C#调用Windows API函数
http://www.51blog.net/showArticle.asp?art_ID=714sample:
[DllImport("Netapi32", CharSet=CharSet.Unicode)]
public static extern int NetMessageBufferSend(string servername, string msgname, string fromname, string buf, int buflen);

Answer 1

int IC_InitComm(short port);
int IC_InitCommAdvanced(short port);
short IC_ExitComm(int idComDev);
short IC_Status(int idComDev);
short IC_Down(int idComDev);

Answer 2

HANDLE   __stdcall  IC_InitComm(__int16 port);
c#
[DllImport("yourDllName", CharSet=CharSet.ANSI)]
public static extern IntPtr IC_INitComm(short port);__int16  __stdcall  IC_ExitComm(HANDLE idComDev);
c#
[DllImport("yourDllName", CharSet=CharSet.ANSI)]
public static extern int IC_ExitComm(IntPtr idComDev);

Answer 3

[DllImport("***.dll")] 
  private static extern IntPtr IC_InitComm(  short port); ,,,,,,[DllImport("***.dll")] 
  private static extern short IC_ExitComm( IntPtr idComDev);

Answer 4

就是调用API函数吧
http://www.yesky.com/20020307/1600638.shtml