About Delphi call C function parameters of the dynamic link library type of problem-CodePudding

Now have a project need to call C DLL
C is the prototype of the function:
Int __stdcall A20_SLE4442VerifyPWD (HANDLE ComHandle, BYTE _PWData [3]).
In Delphi BYTE _PWData [3] what kind of parameters should be passed?

CodePudding user response:

Is an array, the array [0.2] of byte

CodePudding user response:

 
The function A20_SLE4442VerifyPWD (ComHandle: dwords. 
Var _PWData: an array of Byte) : Integer; Stdcall; External 'XXX. DLL'; 

//call 
Var 
Res: Integer; 
Pwdata: an array of Byte [0.. 2]; 
The begin 
Res:=A20_SLE4442VerifyPWD (com handles, pwdata); 
end;

CodePudding user response:

refer to the second floor sololie response:

 
The function A20_SLE4442VerifyPWD (ComHandle: dwords. 
Var _PWData: an array of Byte) : Integer; Stdcall; External 'XXX. DLL'; 

//call 
Var 
Res: Integer; 
Pwdata: an array of Byte [0.. 2]; 
The begin 
Res:=A20_SLE4442VerifyPWD (com handles, pwdata); 
end;

This call to memory

CodePudding user response:

Try change

 
The function A20_SLE4442VerifyPWD (ComHandle: dwords. _PWData: PByte) : Integer; 
Stdcall; External 'XXX. DLL'; 

//call 
Var 
Res: Integer; 
Pwdate: PByte; 
The begin 
GetMem (pwdate, SizeOf (Byte) * 3); 
ZeroMemory (pwdate, 0); 
Res:=A20_SLE4442VerifyPWD (com handles, pwdate); 
FreeMem (pwdate); 
end;