In a Linux system, how to use QT development environment and C++ language to create a shared library project?

The following is the AI’s reply 

To use the QT development environment to do a shared library project on a Linux system, you can follow the following steps:

1. Open QT Creator, create a new project, and select "Shared Library" in the project type.
2. Select the type of shared library you want to create, for example: dynamic shared library or static shared library.
3. Fill in the basic information of the library in the pop-up dialog box, such as the name of the library, version number, author, etc.
4. Click Next and select the compiler and debugger you want to use.
5. Configure the build settings of the library, including compilation options, target platform and target architecture, etc.
6. Click the "Finish" button to create a new shared library project.
7. Add the source code, header files and resource files of the library in Qt Creator.
8. Implement your library functionality, test and debug it.

After you complete the development of a shared library, you can deploy it into other applications and load it dynamically when needed. To do this, you need to place the generated shared library files in the appropriate folders and add the corresponding link options to your application's compiler options.

There are many ways to create a shared library project using the QT development environment on a Linux system. The following is one of them:

1. Open QT Creator, select "New Project", and select "Library" under "Non-QT Project";
2. Select "Shared Library" under "Library Type";
3. Configure the basic information of the library, including name and version number, target platform, etc.;
4. Set the compilation options of the library, including the compiler, library output path, etc.;
5. Write code and compile to generate shared library files.

Note that the generated shared library file needs to be placed in the specified path and linked into the program through compilation options in the program that needs to use the library.
 

Use the QT C++ code project to generate the so library under the Linux system, and explain the steps to create a new project to call the so library

The steps to generate the so library are as follows:

1. Create a new shared library project, select the type of library you want to use, such as dynamic or static library, and set basic information and build options.
2. Add the source code, header files, resource files, etc. that need to be compiled into the project.
3. Define the generated dynamic library in the .pro file, as shown below:

```
TEMPLATE = lib
CONFIG += shared
```

4. Use the qmake tool to generate the Makefile, open the terminal, enter the project directory, and execute the following command:

```
qmake -spec linux-g++ -o Makefile mysharedlib.pro
```

5. Execute the make command to generate the shared library file, as shown below:

```
make
```

6. The shared library file can be found in the generated target folder. The file name starts with lib and ends with .so.

Now that you have successfully generated a shared library, the following steps will guide you on how to create a new project to call it:

1. Create a new console project and set basic information and build options.
2. Create a new C++ source code file and write the code that calls the shared library.
3. Add the target file path and link options of the shared library to the .pro file, for example:

```
LIBS += -L/home/user/mylib -lmysharedlib
```

Among them, the -L option indicates the shared library directory to be linked, and the -l option indicates the shared library file name to be linked (excluding prefix and suffix).

4. Use the API functions provided in the shared library in the C++ code, compile and run the new project.

The above is how to use the QT C++ code project to generate the so library under the Linux system, and explains the steps to create a new project to call the so library. I hope it will be helpful to you.

The steps to use QT C++ code project to generate so library under Linux system are as follows:

1. Open QT-Creator, select "New Project", and select "Library" under "Non-QT Project";
2. Select "Shared Library" under "Library Type";
3. Configure the basic information of the library, including name, Version number, target platform, etc.;
4. Set the compilation options of the library, including compiler, library output path, etc.;
5. Write code and compile to generate shared library files.

The above steps will generate an so library, such as libtest.so. You can use the command `nm -D libtest.so` to confirm the function list in the library.

Next, create a new project to call the so library. The steps are as follows:

1. Open QT-Creator, select "New Project", and select "Empty Project" in "QT Widgets Application";
2. In the project, right-click "Header File" to add included files, right-click "Resources" File" to add relevant resource files;
3. Add the so library that needs to be linked in the .pro file, for example: `LIBS += -L/path/to/so/folder -lname_of_your_so_file`; 4. Write
code and call the corresponding function That’s it.

It should be noted that the code needs to add the corresponding header file to the include file, use the `dlopen()` function to open the shared library, and use the `dlsym()` function to obtain the function pointer of the library. This library can be released through the `dlclose()` function after completion of use.
 

 

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Origin blog.csdn.net/thanklife/article/details/130237553