Qt Programming: Serial Port Communication Module / Plugin

Question

First, let me explain what I'm trying to do:

• I use Qt to create an application mainly based on webkit. This application extracts content from the Internet and presents it to the user in the usual way.

• My application needs to transmit multiple serial port devices, such as a printer, IC card reader.

• These serial port devices have different models, so they have a different communication protocol.

• I want to share my application with serial port devices reporting part, so that I can only update the Communcation part without updating the entire application.

Do I need to write a plugin / webkit Qt plugin or some other way to do this? Any suggestions are welcome!

thank

Answer 1

AFAIK Qt already provides a plugin mechanism.

Note the QLibrary class and examples there.

Answer 2

For the qextserialport serial port part

Answer 3

dll/dynamic library, TARGET = lib CONFIG + = dll qmake.

Answer 4

PluginManager ++.

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// ..

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/* This is the basic plugin header file that every plugin DLL has to include

   Use your compilers pragmas/keywords to export the entire class from the DLL
   In Microsoft land the keywords are _declspec( dllexport ) to export the class
   from the base DLL and __declspec( dllimport ) to import the class into other
   code.  I'm using the MS keywords here because I don't remember how this is done
   in other compilers. :)
*/

#if BUILDING_BASE_PLUGIN
/* You're compiling the DLL that exports the Plugin Base
#define BASE_DLL_EXPORT declspec( dllexport )
#else
/* You're compiling code that uses the plugin base
#define BASE_DLL_EXPORT declspec( dllimport )
#endif

class DLL_EXPORT SerialPortPluginBase
{
public:
    enum SerialPortPluginError{ SUCCESS = 0, ERROR_1, ERROR_2, ERROR_ETC };

    virtual SerialPortPluginError Open( /*Parameters*/ ) = 0;
    virtual SerialPortPluginError Read( /*Parameters*/ ) = 0;
    virtual SerialPortPluginError Write( /*Parameters*/ ) = 0;
    virtual SerialPortPluginError Close( /*Parameters*/ ) = 0;
    static std::string pluginName = "SerialPortPluginBase";
    static int version;
};

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DLL/SO.

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, .:)

Answer 5

Qt :

http://doc.qt.io/archives/qt-4.7/plugins-howto.html

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