How to declare this dll's parameter

[dempty]

Hi guys,

I gotta work with a DLL that need to declare one parameter as structure.

I got a example in delphi and it show this parameter like this

NBioAPI_FIR_PAYLOAD = record
Length : DWORD;
Data : array of BYTE;
end;

After call the dll im suppose to get the info parameter like this:

payload.length

or

payload.data



Thanks of any help

regards,
Diego Imenes

[JC]

Hi guys,

I gotta work with a DLL that need to declare one parameter as structure.

I got a example in delphi and it show this parameter like this

NBioAPI_FIR_PAYLOAD = record
Length : DWORD;
Data : array of BYTE;
end;

After call the dll im suppose to get the info parameter like this:

payload.length

or

payload.data



Thanks of any help

regards,
Diego Imenes

Diego, you can create a lib of this dll with the implib command of BCC55 like this and incorporate into you linkeditor list:

implib.exe dll_file.lib dll_file.dll

[dempty]

Hi guys,

I gotta work with a DLL that need to declare one parameter as structure.

I got a example in delphi and it show this parameter like this

NBioAPI_FIR_PAYLOAD = record
Length : DWORD;
Data : array of BYTE;
end;

After call the dll im suppose to get the info parameter like this:

payload.length

or

payload.data



Thanks of any help

regards,
Diego Imenes

Diego, you can create a lib of this dll with the implib command of BCC55 like this and incorporate into you linkeditor list:

implib.exe dll_file.lib dll_file.dll

How could this help me? As I said the problem isnt work with DLL the problem is work with a dll that one of the parameters need to be a structure and not just a simple var

do you know structure? here is example how to declare a simple structure in c++

struct person
{
string name;
int age;
};

[hua]

Diego,
I've never used structure so I can't answer your question directly however, the following might be of help to you:

1. http://www.xharbour.com/xhdn/referenceg ... e&id=19643

2. http://www.xharbour.com/xhdn/referenceg ... e&id=19640

But you'd need to register and login first.

[Antonio Linares]

Diego,

You can create and manage a structure from FWH this way:

Code: Select all | Expand

STRUCT oMyStruct
   MEMBER length AS LONG  // 32 bits
   MEMBER data AS LPSTR // pointer to a string stored outside the struct
ENDSTRUCT

or

Code: Select all | Expand

STRUCT oMyStruct
   MEMBER length AS LONG  // 32 bits
   MEMBER data AS STRING LEN 100 // 100 bytes inside the struct
ENDSTRUCT

Please make a search for MEMBER in all FWH PRGs (sources and examples) and you will find a lot of examples.

Anyhow, sometimes is better to directly code it using C language. If you provide an example of use in Delphi, we will help you to convert it to C, that you can use from FWH + [x]Harbour

[dempty]

Thanks Antonio!

Now I'm in doubt with another stuff. How do I declare this parameter in dll code?

Here is the example in Delphi:

DLL declaration

NBioAPI_GetInitInfo = Function(hHandle : DWORD; nStructureType : BYTE ; pInitInfo : NBioAPI_INIT_INFO_PTR_0):DWORD; stdcall;

structure declaration

NBioAPI_INIT_INFO_PTR_0 = ^NBioAPI_INIT_INFO_0;
NBioAPI_INIT_INFO_0 = record
StructureType : DWORD; // must be 0
MaxFingersForEnroll : DWORD; // Default = 10
SamplesPerFinger : DWORD; // Default = 2 : not used
DefaultTimeout : DWORD; // Default = 10000ms = 10sec
EnrollImageQuality : DWORD; // Default = 50
VerifyImageQuality : DWORD; // Default = 30
IdentifyImageQuality : DWORD; // Default = 50
SecurityLevel : DWORD; // Default = NBioAPI_FIR_SECURITY_LEVEL_NORMAL
end;


As you can see my problem is just with the last parameter, that is: pInitInfo : NBioAPI_INIT_INFO_PTR_0


I declared this dll function like this in FWH

DLL32 FUNCTION NBioAPI_GetInitInfo(hHandle as DWORD, nStructureType as BYTE, pInitInfo as ??????) AS DWORD PASCAL LIB "NBioBSP.dll"

how about the last one with "??????" ? I really dont know how to declare the structure type info as a dll parameter.

Although, I''ve more than three functions in this dll with this kind of parameter


Thanks again for anyhelp!

[dempty]

its solved!

i declared the structure in fwh in this away:

struct info
MEMBER StructureType AS DWORD
MEMBER MaxFingersForEnroll AS DWORD
MEMBER SamplesPerFinger AS DWORD
MEMBER DefaultTimeout AS DWORD
MEMBER EnrollImageQuality AS DWORD
MEMBER VerifyImageQuality AS DWORD
MEMBER IdentifyImageQuality AS DWORD
MEMBER SecurityLevel AS DWORD
endstruct

also i declared the dll

DLL32 FUNCTION NBioAPI_GetInitInfo(hHandle as DWORD, nStructureType as INT, pInitInfo as LPSTR) AS 12 PASCAL LIB "NBioBSP.dll"

calling the function

NBioAPI_GetInitInfo(teste, 0, @info:cbuffer)

and after i could get all information that i need

? info:StructureType,info:MaxFingersForEnroll,info:SamplesPerFinger,info:DefaultTimeout,info:EnrollImageQuality,info:VerifyImageQuality,info:IdentifyImageQuality,info:SecurityLevel


it works fine! thanks antonio

[Antonio Linares]

Diego,

Excellent!

Yes, LPSTR is the way to provide the pointer to the structure contents