I am not able to open this .a file and don't know how to use it [closed] - c++

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Here is the link: https://github.com/eyetribe
I tried to run this tet-cpp-client and in the output I am getting Gazeapilib.a file, and when I am trying to open it, it's giving me error that I can't open that file.
I want to know how to open this file, and what is the data of this file and how it can be used further in any program? I have not much knowledge about it so please help me to solve this error.
I am running this program in Ubuntu using cmake software.

The .a file is a library file which contains the definitions of the functions in the library that you compiled. It is not a standalone program and must be linked with other code to make a program. You must pass this library file to the linker after building your program.

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c++ visual stodio LNK1107 invalid or corrupt file: cannot read at 0x268 [closed]

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i try to include dll lib file iaxclient.dll in visual studio c++ console project
i add it from linker
image one
image tow
after add it . on i run project i have this error
LNK1107 invalid or corrupt file: cannot read at 0x268
so how i solve it

How to compile C++ codes in Linux with source files hidden? [closed]

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Is there anyway to compile C++ source files in Linux and make these files unreadable to users? Either have the files encrypted or read them into memory is acceptable.
We are developing a Linux based software and we don't want our users to have direct access to our source code files.
Once a binary is created from C++ source files, the original source files are not needed in order to run the program. You can distribute only the compiled program.
Just build a container image with your software and its dependencies and run it anywhere. No need to distribute sources or compile for specific distributions.
You can use Flatpak or Docker, for example.

Creating an sqlite3.lib file / using sqlite3 in Visual Studios [closed]

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I can't for the life of my get this code to compile. I have it running fine on all other computers, but I had to switch to a windows machine and I am attempting to add sqlite3 back to the included header files and it is nothing short of a nightmare.
I have downloading the proper files, installed it correctly, the header file is being found in Visual Studios, but I am getting a ton of unresolved externals. I found that I need to create the .lib file myself and then I should be all set. I went ahead and tried using the LIB.exe included within Visual Studios on the .def file ( I have the .def, .dll, .c, and .exe file), and I get the error that it is unable to open sqlite3.lib. Am I using the wrong command or something? I have spent hours looking it up and I believe I am doing it correctly.
My command is LIB /DEF:sqlite3.def
Should I be using something else? I do not have any object files, just the def file.
The suggested way of using the SQLite library is to embed it directly in your application, i.e., download the amalgamation source code, and just add the sqlite3.c and .h files to your project in the sample place where you have the other source files.

common.h: no such file or directory : Ubuntu [closed]

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I am trying to compile a program(in OpenGL) in Ubuntu, but I am receiving this error
fatal error: common.h: No such file or directory
I am not sure on which package I need to install for this.
common.h is not part of any package. I suspect you took the code out of some project or a tutorial that was part of a whole set of programs. And common.h is a header common to all those projects.
If you arrive at this page, it's possibly because your going through the 'Introduction to Operating Systems' book and tried to copy the code from the intro chapter directly and compile. At least, that's why I ended up here. This won't work, and will throw the above error.
It's best to download the code directly from the source and compile what they give you. Enjoy!

unable to compile mysql source [closed]

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Am trying to compile mysql client library source
source paclage\client\mysql.cc
i used gcc and g++ both
g++ -o mysql.cc mysql.cc
so whenever i compile it always gives error
In file included from mysql.cc:33:0:
client_priv.h:20:23: fatal error: my_global.h: No such file or directory
compilation terminated.
although my_global.h already exists , i moved it to the root folder of mysql.cc but same error , i did everything with it , but same error that library not found , i copied code of my_global.h and paste it in client_priv.h after that when i compile it says other libraries missing which were listed in client_priv.h ........ so help its quite confusing
You should follow official guide
Running gcc is not enough because there are lot of environment settings to be set, eg LIB paths, include paths etc.
They are using CMake to prepare build for you.
UPDATE:
If you want to compile program which will use mysql client library follow this guide.