HTTP library

[jenya7]

I build the library as instructed

# first clone this repository:
$> git clone https://github.com/azadkuh/qhttp.git
$> cd qhttp

# prepare dependencies:
$qhttp/> ./update-dependencies.sh

# now build the library and the examples
$qhttp/> qmake -r qhttp.pro
$qhttp/> make -j 8

Now I want to include it in my project (as I do with others libs)

LIBS += -lqhttp

And get
error: cannot find -lqhttp

How can I actually include the lib in the project?

[jsulm]

@jenya7 said in HTTP library:

How can I actually include the lib in the project?

You forgot to tell linker where to find the lib:

LIBS += -LFOLDER_CONTAINING_THE_LIB -lqhttp

[ChrisW67]

Typically a library like this would have an install target in its Makefile (that derives from the PRO file). Not the case here.

The built library is in the qhttp_build_dir/xbin folder.
The headers needed to compile code to use the library remain in the qhttp/src folder.

You need to install the resulting library and public headers into a system library or include folder.
Alternatively, add the folder to your project:

INCLUDEPATH += /a/path/to/qhttp/src
LIBS += -L/a/path/to/qhttp_build_dir/xbin -lqhttp

Use absolute paths unless you are certain about relative paths.

[jenya7]

@jsulm said in HTTP library:

@jenya7 said in HTTP library:

How can I actually include the lib in the project?

You forgot to tell linker where to find the lib:

LIBS += -LFOLDER_CONTAINING_THE_LIB -lqhttp

I tried

INCLUDEPATH += /home/pi/qhttp/xbin

Still can't find it.

A folder xbin was created home/pi/qhttp/xbin but I see only a shortcut to libqhttp.so in it.

[jsulm]

@jenya7 Please reread what I wrote, I did not write anything about INCLUDEPATH...

[jenya7]

@ChrisW67 said in HTTP library:

Typically a library like this would have an install target in its Makefile (that derives from the PRO file). Not the case here.

The built library is in the qhttp_build_dir/xbin folder.
The headers needed to compile code to use the library remain in the qhttp/src folder.

You need to install the resulting library and public headers into a system library or include folder.
Alternatively, add the folder to your project:

INCLUDEPATH += /a/path/to/qhttp/src
LIBS += -L/a/path/to/qhttp_build_dir/xbin -lqhttp

Use absolute paths unless you are certain about relative paths.

thank you. it works.

[jenya7]

@jsulm said in HTTP library:

@jenya7 Please reread what I wrote, I did not write anything about INCLUDEPATH...

I missed -L. :)

[jenya7]

Now it compiles good. But in run time I get

Starting /home/pi/Projects/build-AgroLogicWidget-Desktop-Debug/AgroLogicWidget...
/home/pi/Projects/build-AgroLogicWidget-Desktop-Debug/AgroLogicWidget: error while loading shared libraries: libqhttp.so.1: cannot open shared object file: No such file or directory

/home/pi/Projects/build-AgroLogicWidget-Desktop-Debug/AgroLogicWidget exited with code 127

[JonB]

@jenya7
So where is your libqhttp.so.1 and how does your application locate it at runtime? And if it can be found, does running ldd on it reveal any missing dependencies?

[jsulm]

@jenya7 said in HTTP library:

libqhttp.so.1

Copy it into your build folder (/home/pi/Projects/build-AgroLogicWidget-Desktop-Debug).
As another solution you can also set LD_LIBRARY_PATH=/home/pi/Projects/build-AgroLogicWidget-Desktop-Debug in your Run configuration in QtCreator.

[jenya7]

@jsulm said in HTTP library:

@jenya7 said in HTTP library:

libqhttp.so.1

Copy it into your build folder (/home/pi/Projects/build-AgroLogicWidget-Desktop-Debug).
As another solution you can also set LD_LIBRARY_PATH=/home/pi/Projects/build-AgroLogicWidget-Desktop-Debug in your Run configuration in QtCreator.

it happens in Debug as well.

[jenya7]

@JonB said in HTTP library:

@jenya7
So where is your libqhttp.so.1 and how does your application locate it at runtime? And if it can be found, does running ldd on it reveal any missing dependencies?

How do we know which one is missing?

ldd /home/pi/qhttp/xbin/libqhttp.so.1
	linux-vdso.so.1 (0xbef67000)
	/usr/lib/arm-linux-gnueabihf/libarmmem-${PLATFORM}.so => /usr/lib/arm-linux-gnueabihf/libarmmem-v7l.so (0xb6f16000)
	libQt5Network.so.5 => /lib/arm-linux-gnueabihf/libQt5Network.so.5 (0xb6d6a000)
	libQt5Core.so.5 => /lib/arm-linux-gnueabihf/libQt5Core.so.5 (0xb68f0000)
	libpthread.so.0 => /lib/arm-linux-gnueabihf/libpthread.so.0 (0xb68c6000)
	libatomic.so.1 => /lib/arm-linux-gnueabihf/libatomic.so.1 (0xb68ad000)
	libstdc++.so.6 => /lib/arm-linux-gnueabihf/libstdc++.so.6 (0xb6766000)
	libm.so.6 => /lib/arm-linux-gnueabihf/libm.so.6 (0xb66e4000)
	libgcc_s.so.1 => /lib/arm-linux-gnueabihf/libgcc_s.so.1 (0xb66b7000)
	libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0xb6569000)
	libz.so.1 => /lib/arm-linux-gnueabihf/libz.so.1 (0xb653e000)
	/lib/ld-linux-armhf.so.3 (0xb6f5c000)
	libicui18n.so.63 => /lib/arm-linux-gnueabihf/libicui18n.so.63 (0xb62f0000)
	libicuuc.so.63 => /lib/arm-linux-gnueabihf/libicuuc.so.63 (0xb616a000)
	libpcre2-16.so.0 => /lib/arm-linux-gnueabihf/libpcre2-16.so.0 (0xb60ee000)
	libdouble-conversion.so.1 => /lib/arm-linux-gnueabihf/libdouble-conversion.so.1 (0xb60ca000)
	libdl.so.2 => /lib/arm-linux-gnueabihf/libdl.so.2 (0xb60b7000)
	libglib-2.0.so.0 => /lib/arm-linux-gnueabihf/libglib-2.0.so.0 (0xb5fa7000)
	libicudata.so.63 => /lib/arm-linux-gnueabihf/libicudata.so.63 (0xb45a9000)
	libpcre.so.3 => /lib/arm-linux-gnueabihf/libpcre.so.3 (0xb4532000)

[JonB]

@jenya7
This shows it is not missing any dependencies. So how do you think your application should know to find and load it from /home/pi/qhttp/xbin?

[jenya7]

@JonB said in HTTP library:

@jenya7
This shows it is not missing any dependencies. So how do you think your application should know to find and load it from /home/pi/qhttp/xbin?

I have

LIBS += -L/home/pi/qhttp/xbin -lqhttp

in pro file

[piervalli]

@jenya7
Sorry, Why do you want use this library? I checked source code, httpclient does not use Qnetworkmanager but, it sends directly with QTcpSocket.

Thanks

[jenya7]

@piervalli said in HTTP library:

@jenya7
Sorry, Why do you want use this library? I checked source code, httpclient does not use Qnetworkmanager but, it sends directly with QTcpSocket.

Thanks

I'm not tied to the lib. any lib I can include in my project without having a heart attack will go. do you have one to suggest?

[JonB]

@jenya7 said in HTTP library:

LIBS += -L/home/pi/qhttp/xbin -lqhttp

This tells the linker where to locate the libqhttp.a file while linking. I am not sure that it puts anything into the executable to tell it to look in that directory for the libqhttp.so file at runtime. See @jsulm's last post earlier on above.

[jenya7]

@JonB said in HTTP library:

@jenya7 said in HTTP library:

LIBS += -L/home/pi/qhttp/xbin -lqhttp

This tells the linker where to locate the libqhttp.a file while linking. I am not sure that it puts anything into the executable to tell it to look in that directory for the libqhttp.so file at runtime. See @jsulm's last post earlier on above.

There is no libqhttp.so in Debug folder. I don't know how it's linked in run time.

[JonB]

@jenya7

@JonB said in HTTP library:

See @jsulm's last post earlier on above.

[jenya7]

well...no luck with the lib. do we have something more user friendly?