C # call C compiled DLL cannot be marshaling "parameter # 1:" invalid managed/unmanaged ty-CodePudding

 
//declare 
[DllImport (" RTDBInterface. DLL, "EntryPoint=" AppendRTTagDataByTagName CharSet=CharSet. Ansi, CallingConvention=CallingConvention. Cdecl)] 
Private static extern int AppendRTTagDataByTagName ([MarshalAs (UnmanagedType. AsAny)] InsertData_struct dt); 

//simple code 
String [] veParams=new String [4]. 
VeParams [0]="D: \ \ vestore \ "; 
VeParams [1]="C: \ \ Windows \ \ SysWOW64 \ "; 
VeParams [2]=""; 
VeParams [3]=""; 
InitConnect (veParams, 1000000); 
InsertData_struct dt=new InsertData_struct (); 
Dt. Type=0; 
Dt. Status=1; 
Dt. Time=1607435725; 
Dt. Value=https://bbs.csdn.net/topics/990.99; 
Dt. PointName="dcs01. TEST0000";; 
Int rs4=AppendRTTagDataByTagName (dt); 
Enclosing listBox1. Items. Add (" wrote: "+ rs4 +" - & gt; "+ dt. Value); 
//c + + struct 
Typedef struct InsertData_struct {
The int type.//to zero for the switch quantity, 1 for analog quantity 
Int the status;//write some records the status of the 
A double value.//write some records the value of the 
Long time;//write some records of time, s 
Char pointName [RTDB_TAGNAME_LENGTH];//write some full name 
} InsertData; 

//c # structure 
Public struct InsertData_struct {
Public int type.//to zero for the switch quantity, 1 for analog quantity 
Public int the status;//write some records the status of the 
Public double value;//write some records the value of the 
Public long time;//write some records of time, s 
Public string pointName;//write some full name 
};

//////////////////////////////////////////////////////////////////////
Anomalies appear the following error

CodePudding user response:

Int is int32, c # and c + + is int16, you need according to the relationship between c # and c + + type is modified, not only the int, char * c + + generally in c # to use StringBuilder instead. To search a type table under reference.

CodePudding user response:

reference 1st floor ziqi0716 response:

int is int32, c # and c + + is int16, you need according to the relationship between c # and c + + type is modified, not only the int, char * c + + generally in c # to use StringBuilder instead. To search a type table under reference.

The part is to modify the structure?

CodePudding user response:

reference peach ripe $_ $2 floor response:

Quote: refer to 1st floor ziqi0716 response:
int is int32, c # and c + + is int16, you need according to the relationship between c # and c + + type is modified, not only the int, char * c + + generally in c # to use StringBuilder instead. To search a type table under reference.

The part is to modify the structure?

that's right

CodePudding user response:

reference ziqi0716 reply: 3/f

Quote: refer to the second floor peach ripe $_ $response:

Quote: refer to 1st floor ziqi0716 response:
int is int32, c # and c + + is int16, you need according to the relationship between c # and c + + type is modified, not only the int, char * c + + generally in c # to use StringBuilder instead. To search a type table under reference.

The part is to modify the structure?

right

Only an increase in

 [MarshalAs (UnmanagedType. LPStr)]

The code will be an error "cannot be marshaling parameter" # 1 ": invalid managed/unmanaged type combination (the value type must be paired with Struct),"

 
[DllImport (" RTDBInterface. DLL, "EntryPoint=" AppendRTTagDataByTagName CharSet=CharSet. Ansi, CallingConvention=CallingConvention. Cdecl)] 
Private static extern int AppendRTTagDataByTagName ([MarshalAs (UnmanagedType. LPStr)] InsertData_struct dt);

Structure increases the

 
Public struct InsertData_struct {
[MarshalAs (UnmanagedType. U4)] 
Public int the status; 
[MarshalAs (UnmanagedType. U4)] 
Public int type. 
[MarshalAs (UnmanagedType. The R8)] 
Public double value; 
[MarshalAs (UnmanagedType. U8)] 
Public long time; 
[MarshalAs (UnmanagedType. LPTStr)] 
Public string pointName; 
};