DllImport遇到的问题

Question

int rf_load_key_hex(int icdev,unsigned char _Mode,unsigned char _SecNr,char *_NKey);功 能：向读写器中装入十六进制密码参 数：icdev：通讯设备标识符       _Mode：密码验证模式       _SecNr：扇区号（0～15）       _Nkey：写入读写器中的卡密码返 回：成功则返回 0int rf_card(int icdev,unsigned char _Mode,unsigned long *_Snr);功 能：寻卡，能返回在工作区域内某张卡的序列号参 数：icdev：通讯设备标识符       _Mode：寻卡模式mode_card       _Snr：返回的卡序列号返 回：成功则返回 0[DllImport("mwrf32.dll",EntryPoint = "rf_load_key_hex",SetLastError = true,CharSet = CharSet.Ansi,ExactSpelling = true,CallingConvention = CallingConvention.StdCall)]public static extern int rf_load_key_hex(int icdev,int Mode,int SecNr,string nKey);
if(rf_load_key_hex(icdev,0,0,"FFFFFFFFFFFF")==0) 为何返回值一直得不到0
还有rf_card应该如何写，请各位帮忙看看

Answer 1

[DllImport("mwrf32.dll",EntryPoint = "rf_load_key_hex",SetLastError = true,CharSet = CharSet.Ansi,ExactSpelling = true,CallingConvention = CallingConvention.StdCall)]public static extern int rf_load_key_hex(int icdev,byte Mode,byte SecNr,string nKey);[DllImport("mwrf32.dll",EntryPoint = "rf_card",SetLastError = true,CharSet = CharSet.Ansi,ExactSpelling = true,CallingConvention = CallingConvention.StdCall)]
int rf_card(int icdev,byte _Mode,byte[] _Snr);

Answer 2

[Quote=引用 1 楼 xingyuebuyu 的回复:]
试了[DllImport("mwrf32.dll",EntryPoint = "rf_load_key_hex",SetLastError = true,CharSet = CharSet.Ansi,ExactSpelling = true,CallingConvention = CallingConvention.StdCall)]public static extern int rf_load_key_hex(int icdev,byte Mode,byte SecNr,string nKey);
不能得到0

Answer 3

    [System.Runtime.InteropServices.DllImportAttribute("mwrf32.dll", EntryPoint="rf_load_key_hex")]
public static extern  int rf_load_key_hex(int icdev, byte _Mode, byte _SecNr, System.IntPtr _NKey) ;
    [System.Runtime.InteropServices.DllImportAttribute("mwrf32.dll", EntryPoint="rf_card")]
public static extern  int rf_card(int icdev, byte _Mode, ref uint _Snr) ;

Answer 4

[DllImport("mwrf32.dll",EntryPoint = "rf_load_key_hex",SetLastError = true,CharSet = CharSet.Ansi,ExactSpelling = true,CallingConvention = CallingConvention.StdCall)]public static extern int rf_load_key_hex(int icdev,byte Mode,byte SecNr,System.Text.StringBuilder nKey);System.Text.StringBuilder sb=new System.Text.StringBuilder(256);
再调用rf_load_key_hex()http://topic.csdn.net/t/20060406/12/4667154.html
[DllImport("mwrf32.dll")]   
  public   static   extern   short   rf_card(int   icdev,   int   mode,   ref   int   Snr);   
    
  调用：   
    
  int   cardmode=1;   
    
  retcode   =   CRF35.rf_card(icdev,   cardmode,ref   Snrl);

Answer 5

rf_load_key_hex已经解决，rf_card目前还未解决，自己顶

Answer 6

[Quote=引用 1 楼 xingyuebuyu 的回复:]
试了[DllImport("mwrf32.dll",EntryPoint = "rf_load_key_hex",SetLastError = true,CharSet = CharSet.Ansi,ExactSpelling = true,CallingConvention = CallingConvention.StdCall)]public static extern int rf_load_key_hex(int icdev,byte Mode,byte SecNr,string nKey);
不能得到0

Answer 7

Wtypes.h   中的非托管类型         非托管C   语言类型         托管类名               说明     
  HANDLE                                           void*                               System.IntPtr     32   位     
  BYTE                                               unsigned   char               System.Byte         8   位     
  SHORT                                             short                               System.Int16       16   位     
  WORD                                               unsigned   short             System.UInt16     16   位     
  INT                                                 int                                   System.Int32       32   位     
  UINT                                               unsigned   int                 System.UInt32     32   位     
  LONG                                               long                                 System.Int32       32   位     
  BOOL                                               long                                 System.Int32       32   位     
  DWORD                                             unsigned   long               System.UInt32     32   位     
  ULONG                                             unsigned   long               System.UInt32     32   位     
  CHAR                                               char                                 System.Char         用   ANSI   修饰。     
  LPSTR                                             char*                               System.String   或   System.StringBuilder   用   ANSI   修饰。     
  LPCSTR                                           Const   char*                   System.String   或   System.StringBuilder   用   ANSI   修饰。     
  LPWSTR                                           wchar_t*                           System.String   或   System.StringBuilder   用   Unicode   修饰。     
  LPCWSTR                                           Const   wchar_t*             System.String   或   System.StringBuilder   用   Unicode   修饰。     
  FLOAT                                             Float                                 System.Single   32   位     
  DOUBLE                                           Double                                   System.Double   64   位
http://topic.csdn.net/t/20040816/11/3278042.html

Answer 8

[DllImport("mwrf32.dll",EntryPoint = "rf_load_key_hex",SetLastError = true,CharSet = CharSet.Ansi,ExactSpelling = true,CallingConvention = CallingConvention.StdCall)]
public static extern int rf_load_key_hex(int icdev,byte Mode,byte SecNr,string NKey);
我使用rf_load_key_hex(icdev,0,1,"FFFFFFFFFFFF") 无法返回0
但是我用rf_load_key_hex(icdev,0,1,"000000000000") 能返回0，
应该是两者都返回0才正确，请指点一下

Answer 9

根据5楼说的System.Text.StringBuilder sb=new System.Text.StringBuilder(256);
再调用rf_load_key_hex()
NKey的类型是StringBuilder
不行？