导入DLL是不是这样呢?
[DllImport("Mos200Dll.dll")]
public static extern   void   GetScanPic(string sFile,int a);
[DllImport("Mos200Dll.dll")]
public static extern   void  OmrS(string[] args);
[DllImport("Mos200Dll.dll")]
public static extern  string[] OmrG()