Qt function call in vb.net

Hi

I am building a program in VB.net and almost done with it. but I have some problem with getting http response.
Getting http response in qt is much much faster. If I want to use the http request function of qt4 in a vb.net then how to proceed?

I dont know whether this is possible or just an absurd idea.

Please give your response and the possible way of combining it..

Thanks in advance.

just google 'c++ dll from vb.net' - that will give you plenty of ideas :)

Quote:

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Originally Posted by schnitzel

just google 'c++ dll from vb.net' - that will give you plenty of ideas :)

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schnitzel Thanks for your reply.

Say I have a Qt C++ code which will return a string variable say. Now I want to use this string variable in my vb.net code for further processing. Can you help me on that pls.

Thanks in advance.

Quote:

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Originally Posted by abghosh

schnitzel Thanks for your reply.

Say I have a Qt C++ code which will return a string variable say. Now I want to use this string variable in my vb.net code for further processing. Can you help me on that pls.

Thanks in advance.

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see if this helps: http://www.codeproject.com/KB/dotnet/c_dll_in_vb.aspx

Quote:

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Originally Posted by schnitzel

see if this helps: http://www.codeproject.com/KB/dotnet/c_dll_in_vb.aspx

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Hi schnitzel

A lot thanks for your help.
Now I would like to ask you one more question. May be silly...

How can I make DLL file from a qt project?

Quote:

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Originally Posted by abghosh

Hi schnitzel

A lot thanks for your help.
Now I would like to ask you one more question. May be silly...

How can I make DLL file from a qt project?

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It isn't a silly question but it doesn't belong here.
Btw: you should learn how to read Qt Documentation.

You should make a big bookmark to this: http://doc.qt.nokia.com/4.6/

specific to your question:
http://doc.qt.nokia.com/4.6/sharedlibrary.html

Hi

I have taken the following code from a webpage and tried to test the call.

Global header file:

Code:

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#ifndef QTENGINEDLL_GLOBAL_H
#define QTENGINEDLL_GLOBAL_H
 
#include <QtCore/QtGlobal>
 
#if defined(QTENGINEDLL_LIBRARY)
#  define QTENGINEDLLSHARED_EXPORT Q_DECL_EXPORT
#else
#  define QTENGINEDLLSHARED_EXPORT Q_DECL_IMPORT
#endif
 
#endif // QTENGINEDLL_GLOBAL_H

---

QtEngineDll.h

Code:

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#ifndef QTENGINEDLL_H
#define QTENGINEDLL_H
 
#include "qtenginedll_global.h"
 
class QTENGINEDLLSHARED_EXPORT QtEngineDll {
public:
    QtEngineDll();
    int randInt();
 
};
 
#endif // QTENGINEDLL_H

---

QtEngineDll.cpp

Code:

---

#include <QTime>
#include "qtenginedll.h"
 
 
QtEngineDll::QtEngineDll()
{
    //Create random number seed
    QTime time = QTime::currentTime();
    qsrand((uint)time.msec());
}
 
int QtEngineDll::randInt()
{
    // Random number between low and high
    //return qrand() % ((aHigh + 1) - aLow) + aLow;
    return 0;
}

---

Now while calling from Vb .net I am using the following command:

Code:

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<DllImport("G:\Varen_CS\02_Projects\01_Softwares\highFreqTrad\QtDLLImport\test\test\debug\test.dll", _
               CallingConvention:=CallingConvention.StdCall)> _
    Private Shared Function QtEngineDll() As Integer
    End Function

---

It is giving me the error: Unable to find an entry point named 'QtEngineDll' in DLL

Can you pls tell me what the wrong I am do'g and what is the entry point to be used from the code?
Also how should I define a different entry point in a dll?
Is it possible to define multiple entry points in a single dll?


Thanks in advance.

Ok I got it.

But now I am facing a new problem. I am passing a string value as an argument. But It is reading its ascii value.