How to use a dll function

[aldoduju]

what I want is to write functions essaduas delphi for Qt, they were written within a dll. I would like to create a dll with these functions and add to my project and make use of functions. they lit externally. understand?

code
@function ReadString(lpAddress:DWORD):string;
var
i: Cardinal;
begin
Result := ''; // Inicia o resultado como nulo, caso não exista nada nesse address.
for i := 0 to 65535 do begin // Começa o loop
if PBYTE(lpAddress)^ = 0 then Break; // Se o primeiro byte for 0 (sem caracteres), sai do loop.
Result := Result + Chr(PBYTE(lpAddress)^); // Retorno da função = Retorno (caso já esteja depois do segundo loop + Caractere resultante do Chr (que retorna um caractere de um código ASCII especificado).
Inc(lpAddress); // Vai pro próximo caractere/byte.
end;
end;

procedure WriteByte(lpAddress:DWORD;Value:Byte);
begin
PBYTE(lpAddress)^ := Value; // O conteúdo do pointer definido no parâmetro "lpAddress", em byte, vai ser igual ao definido no parâmetro "Value".
end;
@

[andre]

Ok, so it really is about making use of an external .dll in a Qt application. What about Gerolfs contribution above isn't clear in this context? The point is that you need to make sure you export your application in a way that makes reuse from another application in another language possible. How you do that, is not Qt specific but something you need to look into for delphi.

[aldoduju]

I'll try to be clear, I would like to write a dll in transposing this procedure for Qt C + + Qt if it is not possible in this case I tereria that make use of it externally.

one has to create a dll with this procedure implemented in Qt?

graciously

[andre]

No, you can use external dll's in Qt (or any other C++) applications. However, that dll needs to meet certain criteria, depending on the way you wish to use that dll. Gerolf talked about these criteria, and I suggest you search in dephi resources how to achieve this. The keyword to search for is exporting functions.

[aldoduju]

and changed the focus, I noticed that it is easier to make the dll in the same Qt.

I wonder what kind of data to corespondete (Cardinal of Delphi) to Qt?

graciously

[andre]

Sorry, I don't understand the question.

[aldoduju]

code in the above described i: = Cardinal.

Cardinal is a type of data used in Delphi, I wonder what kind of data coresponding Qt

[andre]

Basically, it is an unsigned 32 bits integer, in the current version of Delphi, if I can trust what a quick Google search tells me. quint32 would be the compatible type in Qt on all platforms.

[goetz]

Are you asking for advice on how to port the Delphi/Pascal code to C++/Qt?

[giesbert]

If I understood correctly, you want to use existing Delphi/Pascal code within Qt? Or is it more like what Volker asked?

[andre]

[quote author="aldoduju" date="1300650793"]and changed the focus, I noticed that it is easier to make the dll in the same Qt.

I wonder what kind of data to corespondete (Cardinal of Delphi) to Qt?
[/quote]
From this posting, I gather that aldoduju has changed his mind, and now instead of wanting to use a delphi-build dll in a Qt program, now wants to port his code to Qt and build the dll in Qt.

[aldoduju]

Yes, at first I wanted to use to access the dll made ​​in Delphi, now I want to create this dll
code in C + + Qt

[shisen]

hi aldoduju..

i also want to create a dll in Qt and call an mfc dll made by msvc..if u had any progress can i get some proper pointers

[giesbert]

hi shisen, what you ask is a new topic. please open a new thread for it. Thanks.