C # call c dynamic libraries-CodePudding

C # call dynamic library of vc + +
Function prototypes: int Test (char * pcInput, char * pcOutput)
PcInput structure:

 
Typedef struct 
{
Char transypte [2]. 
Char misNo [6]. 
Char amount [12]. 
Char cashier [8]. 
Char bar_code [50]. 
Char old_shop_code [50]. 
Char old_cardback [4]. 
Char old_trace [6]. 
Char old_reference [8]. 
Char old_date [8]. 
Char old_time [6]. 
Char TerNo [15]. 
Char MerchNo [12]. 
Char barcode_type [4]. 
} pcInput;

PcOutput structure:

 
Typedef struct 
{
Char transypte [2]. 
Char misNo [6]. 
Char amount [12]. 
Char cashier [8]. 
Char resp_code [2]. 
Char rspinfo [100]. 
Char mask_cardno [19]. 
Char shop_code [50]. 
Char barcode_type [4]. 

Char pay_type; 

Char trace [6]. 
Char reference [8]. 
Char date [8]. 
Char time [6]. 
Char batch [8]. 
Char TerNo [15]. 
Char MerchNo [12]. 
Char act_amt [12]. 
} OutPutData;

In c # statement

 
[DllImport (" test. DLL, "EntryPoint=" test ")] 
Public static extern int Test ([MarshalAs (UnmanagedType. LPStr)] PcInfo data, [MarshalAs (UnmanagedType. LPStr)] ref OutData res);

PcInfo structure:

 
[StructLayout (LayoutKind. Sequential CharSet=CharSet. Ansi)] 
Public struct PcInfo 
{

[MarshalAs (UnmanagedType ByValArray, SizeConst=2)] 
Public string transypte; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=6)] 
Public string misNo; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=12)] 
Public string amount; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=8)] 
Public string cashier; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=50)] 
Public string bar_code; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=50)] 
Public string old_shop_code; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=4)] 
Public string old_cardback; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=6)] 
Public string old_trace; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=8)] 
Public string old_reference; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=8)] 
Public string old_date; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=6)] 
Public string old_time; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=15)] 
Public string TerNo; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=12)] 
Public string MerchNo; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=4)] 
Public string barcode_type; 
}

OutData structure:

 
[StructLayout (LayoutKind. Sequential CharSet=CharSet. Ansi)] 
Public struct OutData 
{
[MarshalAs (UnmanagedType ByValTStr, SizeConst=2)] 
Public string transypte; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=6)] 
Public string misNo; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=12)] 
Public string amount; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=8)] 
Public string cashier; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=2)] 
Public string resp_code; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=100)] 
Public string rspinfo; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=19)] 
Public string mask_cardno; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=50)] 
Public string shop_code; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=4)] 
Public string barcode_type; 

Public char pay_type; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=6)] 
Public string trace; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=8)] 
Public string reference. 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=8)] 
Public string date; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=6)] 
Public string time; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=8)] 
Public string batch; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=15)] 
Public string TerNo; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=12)] 
Public string MerchNo; 
[MarshalAs (UnmanagedType ByValTStr, SizeConst=12)] 
Public string act_amt; 
}

Then call complains:

Answer, o what reason is this,,, no points

CodePudding user response:

Should be the parameter types do not match

CodePudding user response:

I change to public static extern int TransDo (IntPtr data, ref IntPtr res);

 
IntPtr infosIntptr=StructToIntPtr (oc); 

Int sizeOut=Marshal. SizeOf (typeof (OutData)); 
IntPtr outptr=Marshal. AllocHGlobal (sizeOut); 

Int x=TransDo (infosIntptr, ref outptr); 

Var output=Marshal. PtrToStructure (outptr, typeof (OutData)); 

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