Protocol Implementation. ?

[mazurekwrc]

so take it in comments as I have written avbove

[dheeraj]

hey mazurekwrc i tried what you told but i get a error saying

1>LINK : fatal error LNK1181: cannot open input file 'qextserialport.lib'

1>LINK : fatal error LNK1181: cannot open input file 'qextserialport.lib'

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So i added the path of the folder where qextserialport is "C:\qextserialport-1.1\qextserialport"
there is no qextserialport.lib file though.Now when i build the program again i get a new error

>LINK : fatal error LNK1181: cannot open input file 'C:\qextserialport-1.1\qextserialport.obj'

>LINK : fatal error LNK1181: cannot open input file 'C:\qextserialport-1.1\qextserialport.obj'

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even get a warning

1>.\MessageWindow.cpp(90) : warning C4100: 'event' : unreferenced formal parameter

1>.\MessageWindow.cpp(90) : warning C4100: 'event' : unreferenced formal parameter

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Hey i don't find any qextserialport.lib file any where in the qextserialport folder.

[mazurekwrc]

add
CONFIG += staticlib
in qexterialport.pro file, then run qmake, nmake, go to example and run do the same

[dheeraj]

Hey mazurekwrc Thank you. finally after couple of weeks of breaking head got the output for the example. The GUI was displayed once the example was complied. I need to check if it works fine to send a message from one computer to another.
And i have a doubt what does the line

" CONFIG += staticlib"

" CONFIG += staticlib"

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in qexterialport.pro file actually do all the linker errors were removed. ?? Hey and do i need to qmake and nmake all the qexterialport programs in order to work. I am using Qt 4.3.3 integrated with VS2005.net. cause i don't do qmake and nmake for all the other programs which i have been doing all these dazz.

[mazurekwrc]

here you got about config += staticlib
http://doc.trolltech.com/4.3/qmake-c...ding-a-library

you asked also about qmake, it's used to create a platform-specific makefile from the project file, so if we changed .pro file we need to use it, and at the end we use nmake to build program

[wysota]

Hi wysota
The first error takes me to this part of the code.

void MessageWindow::customEvent(QEvent* event)
{
	if (static_cast<MessageWindow::EventType>(event->type()) == MessageWindow::MessageEvent)
 
msgTextEdit.append(dynamic_cast<MessageEvent::MessageEvent* >(event)->msg); // '{ctor}' Error takes me to this line 
}

void MessageWindow::customEvent(QEvent* event)
{
	if (static_cast<MessageWindow::EventType>(event->type()) == MessageWindow::MessageEvent)
		
msgTextEdit.append(dynamic_cast<MessageEvent::MessageEvent* >(event)->msg); // '{ctor}' Error takes me to this line 
}

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the second error takes me to this line.

QCoreApplication::postEvent(this, new MessageEvent::MessageEvent(qmsg));

QCoreApplication::postEvent(this, new MessageEvent::MessageEvent(qmsg));

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The problem seems to be the dynamic_cast. Maybe your compiler has support for it turned off or you compiled Qt without RTTI support.

[dheeraj]

Hi wysota i think the problem is solved finally. I am able to run the qextserialport examples but with a few warnings. I even tested one example program on RS232 cable connected to two computer and it is working. mazurekwrc asked me to add " CONFIG += staticlib" to .pro file. I did it and finally worked. But i had to comment these two lines

msgTextEdit.append(dynamic_cast<MessageEvent::MessageEvent* >(event)->msg);
 
QCoreApplication::postEvent(this, new MessageEvent::MessageEvent(qmsg));

msgTextEdit.append(dynamic_cast<MessageEvent::MessageEvent* >(event)->msg);

QCoreApplication::postEvent(this, new MessageEvent::MessageEvent(qmsg));

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only then it works . Hey do you have any extra serial communication example. So that i can learn how to send a Frame in a format like i asked in the first post.

Thank You So much wysota

[wysota]

QExtSerialPort gives you access to the serial communication through the QIODevice API, so I suggest you start by taking a look at it.

[dheeraj]

Hi wysota i was able to run all the example programs. I started a new QtApplication Project i wanted to send a string of numbers through serial port on click of a OK button on the GUI form. But i get two linker errors i tried so much but cud't clear the error's pls help me with tthis problem. These are the error's

select_spacecraft.obj : error LNK2019: unresolved external symbol "public: __thiscall QextSerialPort::QextSerialPort(class QString const &,enum QextSerialBase::QueryMode)" (??0QextSerialPort@@QAE@ABVQString@@W4QueryMode@QextSerialBase@@@Z) referenced in function "public: __thiscall select_spacecraft::select_spacecraft(class QWidget *)" (??0select_spacecraft@@QAE@PAVQWidget@@@Z)
F:\lpsu_gui 8 RS232\Debug\lpsu_gui.exe : fatal error LNK1120: 1 unresolved externals
Build log was saved at "file://f:\lpsu_gui 8 RS232\lpsu_gui\Debug\BuildLog.htm"

select_spacecraft.obj : error LNK2019: unresolved external symbol "public: __thiscall QextSerialPort::QextSerialPort(class QString const &,enum QextSerialBase::QueryMode)" (??0QextSerialPort@@QAE@ABVQString@@W4QueryMode@QextSerialBase@@@Z) referenced in function "public: __thiscall select_spacecraft::select_spacecraft(class QWidget *)" (??0select_spacecraft@@QAE@PAVQWidget@@@Z)
F:\lpsu_gui 8 RS232\Debug\lpsu_gui.exe : fatal error LNK1120: 1 unresolved externals
Build log was saved at "file://f:\lpsu_gui 8 RS232\lpsu_gui\Debug\BuildLog.htm"

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I have attached the .h and .cpp files also.

[dheeraj]

Hi friends can you pls tell me what is wrong in my program. I am trying to remove those linker errors but not able to clear them.

[wysota]

Did you link with the library?

[dheeraj]

Ya i did link every thing but i have this error. !! All the example qextserialport programs
work perfectly but the one i created has these link error's.


Thank You

[wysota]

Could you show your project file? Does QExtSerialPort contain the constructor mentioned in the error? Also make sure you got the class name right. Is it QextSerialPort or QExtSerialPort?