Hi, I use Qt 4.7.4 on Win7 with Visual Studio 2010(64bit).

I wanted to install QextSerialPort as static library, and I followed the instructions here.
It says:
Usage(3)：Shared or Static Library Without Installation

If I don't want to install the library to my system. How should I do?

It's easy too. ;-)

1. 【Config】 Write a config.pri file.(read config_example.pri for reference):

shared library
static library

2. 【Build】 Changed to subdirectory buildlib, run

Qt Code: 
  1. qmake
  2. make
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shared or static library will be generated.

3. 【Usage】 Add following line to your qmake project file:

Qt Code: 
  1. # xxxx.pro
  2. include(pathToPri/qextserialport.pri)
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My question: What did I do wrong when I did the following:
And yet another thing: Is it possible that I have to install certain drivers before I install QextSerialPort ?

So I started with the config.pri file.
It now looks like this:
Qt Code: 
  1. # This is an example config.pri for building and using qextserialport.
  2. # 
  3. # When using the qextserialport, all you need is to add following line
  4. # in your .pro file:
  5. #    include(pathToQextserialport/src/qextserialport.pri)
  6. #
  7. # uncomment the following line if you want to use qextserialport as library
  8. QEXTSERIALPORT_LIBRARY = yes
  9.  
  10. # uncomment the following line too if you want to use it as static library
  11. QEXTSERIALPORT_STATIC = yes
  12.  
  13. # comment following line if you always want to enable "udev" under linux
  14. # QEXTSERIALPORT_WITH_UDEV = yes
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I run qmake in the buildlib directory, then nmake. (I copied qmake.exe in that folder, then worked with Visual Studio Command Prompt x64. I guess this is not the usual way to do this?)
Anyway, it did its job without errors.
Then I edited my .pro file to look like this:
(I added include(QExtSerialPort/src/qextserialport.pri))
Qt Code: 
  1. #Schnarchdaten_Reader
  2. #--------------------------------------------------
  3.  
  4. TEMPLATE = app
  5. CONFIG += qt
  6. QT += core gui
  7.  
  8. #--------------------------------------------------
  9.  
  10. HEADERS += schnarchdaten_reader.h\
  11. 		datentyp.h\
  12. 			Buffer.h\
  13. 				qcustomplot.h
  14.  
  15. #--------------------------------------------------
  16.  
  17. SOURCES += main.cpp\
  18. 		schnarchdaten_reader.cpp\
  19. 			Datentyp.cpp\
  20. 				Buffer.cpp\
  21. 					qcustomplot.cpp
  22.  
  23. #--------------------------------------------------
  24.  
  25. include(QExtSerialPort/src/qextserialport.pri)
  26.  
  27. #--------------------------------------------------
  28.  
  29. FORMS += schnarchdaten_reader.ui
  30.  
  31. #--------------------------------------------------
  32.  
  33. TARGET = Schnarchdaten_Reader
  34.  
  35. #--------------------------------------------------
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Now I create a new project in Visual Studio by Qt->Open .pro-file
My new project is being put together.
But when I try to Compile and Run, I get that weird message "error LNK1104: File"\.obj" can't be opened."

Though, the QextSerialPort class is getting recognized and I can use it to create objects and use functions.

I tried to change my .pro modification to include(Schnarchdaten_Reader/QExtSerialPort/src/qextserialport.pri)
I think this is wrong, because my projects directory is: like this:
Schnarchdaten_Reader
.pro file
QExtSerialPort
folders and files of QExtSerialPort

But: After doing the same stuff as described above I can at least start the project, but as soon as I make a new QextSerialPort Object I get Linker errors refering to QextSerialPort.

Which would be the right setting for that?

I have spent the whole day trying to fix that, so any help/guess/hint is highly appreciated.

Sorry for the long post and thank you very much for reading it!

Greetings
sHs