[Solved] QFtp and qt5 linking problem

Dacown

@mrjj
I have compiled the QFtp once in release mode and once in debug mode.
I only got the files in each case:
libQt5Ftp.a
Qt5Ftp.dll

C:/Qt/Tools/mingw730_32/bin/../lib/gcc/i686-w64-mingw32/7.3.0/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lQt5Ftpd
collect2.exe: error: ld returned 1 exit status

the error i get now is from a project that was running with QFtp before. i have now installed the latest QT version and wanted to include QFTP there again so i can continue using the project.
I have tried to compile this project in debug modus

mrjj

@Dacown

You get this error when you try to use the Qt5Ftp from your app right ?

Dacown

@mrjj
yes if i try to compile it.

I have tried now to compile QFTP on a other system.
There it works i get the 4 files.

Now i have test to compile my project on this machine, i have the same error.

mrjj

@Dacown
ok but if you get the dlls then
just make sure you use the right version
for the app.
Release DLL for Release App
and Debug Dll ( d in name) for Debug App
Dont mix it.

Also make sure the path you add to your pro file matches where you put the dll.

MEMekaniske

Have been trying to get QFtp to work myself for 2 days now, think I'll just go back to the stoneage for this one app and use a very old qt with FTP..

Have been doing amazing things with Qt.. from 3D to automation control and sensing, but this one library will have me going nuts if I don't stop trying...

Thumbs up to everyone being able to get a usable lib out of this :)

SGaist

Hi and welcome to devnet,

What issues are you getting ?

MEMekaniske

@SGaist

Hello and thanks for the welcome :)

First I had built a .lib with nmake and tried to include that, but i could not load any modules.
Then I built a .a type lib, with mingw make and that would not let me load any modules either.

I also added the qurlinfo and qftp cpp classes to my project but there was no change.
So I gave up and removed all the linking in .pro etc.

Today after seeing your post I included the .lib again, without removing the .a from the qtftp lib folder, also with the copied qurlinfo and qft in my project, now it actually seems to work when using it as release, the "d" libs have not been built(?).

Only confirmation that I get that it might be working is this, maybe you can confirm if this only shows up if the modules/library are in working order or if they would show up anyway because of the included qurlinfo and qtftp classes?

Code:

QFtp ftp;
       ftp.connectToHost("ftp.host.no");
       ftp.login("username","pass");
       qDebug() << "Ftp:";
       qDebug() << ftp.state();
       qDebug() << ";FTP";
       ftp.close();

Result

Ftp:
0
;FTP
QIODevice::write (QTcpSocket, "QFtpPI_socket"): device not open

If I add Qt +=ftp to .pro
then it cannot find the module.

Thanks

------- Edit -----

I was tempted to try again, I ran qmake, mingw32-make and install, then did the changes in .pro with @ config, and ran make again,
it has now provided dlls too. I add the library to my project with qt creator then i added ftp to my .pro, and that did not produce any fail, but it will only let me load QtFtp/QtFtpDepends?

Also, only other change i have done other then adding @ at start and end of config, is when I had an error:
fatal error: QtFtp/qurlinfo.h: No such file or directory
#include <QtFtp/qurlinfo.h>

when running the first make, so I went into src/qftp and changed in qftp.h
#include <QtFtp/qurlinfo.h> to #include <qurlinfo.h> which solved it.
don't know if it should have found another file which is in the mislocated folder QtFtp?

if it is of any relevance, this is the qtftp I've downloaded https://github.com/qt/qtftp

SGaist

Did you ran make install after building ?

MEMekaniske

@SGaist

yes i did,

mingw32-make install
cd src\ && ( if not exist Makefile I:\Qt\5.14.0\mingw73_64\bin\qmake.exe -o Makefile C:\Users\k\Downloads\qtftp-mas\qtftp\src\src.pro ) && mingw32-make -f Makefile install
mingw32-make[1]: Entering directory 'C:/Users/k/Downloads/qtftp-mas/qtftp/src'
cd qftp\ && ( if not exist Makefile I:\Qt\5.14.0\mingw73_64\bin\qmake.exe -o Makefile C:\Users\k\Downloads\qtftp-mas\qtftp\src\qftp\qftp.pro ) && mingw32-make -f Makefile install
mingw32-make[2]: Entering directory 'C:/Users/k/Downloads/qtftp-mas/qtftp/src/qftp'
copy /y ....\lib\Qt5Ftp.dll I:\Qt\5.14.0\mingw73_64\bin\Qt5Ftp.dll
1 file(s) copied.
I:\Qt\5.14.0\mingw73_64\bin\qmake.exe -install sed -e "s,C:/Users/k/Downloads/qtftp-mas/qtftp/lib,I:/Qt/5.14.0/mingw73_64/lib,g" -e "s,C:\\Users\\k\\Downloads\\qtftp-mas\\qtftp\\lib,I:\\Qt\\5.14.0\\mingw73_64\\lib,gi" ....\lib\pkgconfig\Qt5Ftp.pc > I:\Qt\5.14.0\mingw73_64\lib\pkgconfig\Qt5Ftp.pc
copy /y ....\lib\libQt5Ftp.a I:\Qt\5.14.0\mingw73_64\lib\libQt5Ftp.a
1 file(s) copied.
I:\Qt\5.14.0\mingw73_64\bin\qmake.exe -install qinstall C:\Users\k\Downloads\qtftp-mas\qtftp\include\QtFtp\QtFtpDepends I:\Qt\5.14.0\mingw73_64\include\QtFtp\QtFtpDepends
I:\Qt\5.14.0\mingw73_64\bin\qmake.exe -install qinstall C:\Users\k\Downloads\qtftp-mas\qtftp\mkspecs\modules-inst\qt_lib_ftp.pri I:\Qt\5.14.0\mingw73_64\mkspecs\modules\qt_lib_ftp.pri
I:\Qt\5.14.0\mingw73_64\bin\qmake.exe -install qinstall C:\Users\k\Downloads\qtftp-mas\qtftp\mkspecs\modules-inst\qt_lib_ftp_private.pri I:\Qt\5.14.0\mingw73_64\mkspecs\modules\qt_lib_ftp_private.pri
I:\Qt\5.14.0\mingw73_64\bin\qmake.exe -install qinstall C:\Users\k\Downloads\qtftp-mas\qtftp\lib\cmake\Qt5Ftp\Qt5FtpConfig.cmake I:\Qt\5.14.0\mingw73_64\lib\cmake\Qt5Ftp\Qt5FtpConfig.cmake
I:\Qt\5.14.0\mingw73_64\bin\qmake.exe -install qinstall C:\Users\k\Downloads\qtftp-mas\qtftp\lib\cmake\Qt5Ftp\Qt5FtpConfigVersion.cmake I:\Qt\5.14.0\mingw73_64\lib\cmake\Qt5Ftp\Qt5FtpConfigVersion.cmake
mingw32-make[2]: Leaving directory 'C:/Users/k/Downloads/qtftp-mas/qtftp/src/qftp'
mingw32-make[1]: Leaving directory 'C:/Users/k/Downloads/qtftp-mas/qtftp/src'

the resulting lib files i get is these

libQt5Ftp.a
Qt5Ftp.dll
Qt5Ftp.dll.debug
Qt5Ftp.prl

.a is the one i link to, qt creator then adds this to the my project file

win32:CONFIG(release, debug|release): LIBS += -LC:/Users/k/Downloads/qtftp-mas/qtftp/lib/ -lQt5Ftp
else:win32:CONFIG(debug, debug|release): LIBS += -LC:/Users/k/Downloads/qtftp-mas/qtftp/lib/ -lQt5Ftpd
else:unix: LIBS += -LC:/Users/k/Downloads/qtftp-mas/qtftp/lib/ -lQt5Ftp

INCLUDEPATH += C:/Users/k/Downloads/qtftp-mas/qtftp
DEPENDPATH += C:/Users/k/Downloads/qtftp-mas/qtftp

edit/addon;
exact process was;
opening the qt 5.14 mingw command terminal

then to run qmake, which creates the stash file.
then i run mingw32-make after removing QtFtp/ from the include line in qftp.h,
then i added @ before and after config in pro and built again (if not, there is no dlls built?)
then i run the mingw32-make install
then i add the library to my project via qt creator
then ftp to Qt += in the .pro file (qt creator does not show any missing lib after project read anymore, so something is working)
but still cannot find anything else then QtFtp\QtFtpDepends

and if I add the qftp and qurlinfo to my project too, then i can load the QFtp class but not use it for anything it just gives me the debug:
QIODevice::write (QTcpSocket, "QFtpPI_socket"): device not open
and the state "0"

anyway, I think that if it was actually loading all the QFtp modules then I would not need to have qftp and qurlinfo in my project folder, just have the link to the lib?... any idea?

Glad that I still qualify for the indie package, because paying 5000$ each year to not even get a library or package installer is a pretty sick price... Was going to solve my problem with FTP not being availiable with just regular accessmanager put/get and use mysql for the "directory" listings, but turns out mysql is not availiable either... so only option seems to be having another computer/mcu running as a server with sqlite and then send & retrive the commands with udp/tcp.. which works, but is a pain and not efficient..

Finally managed to get mysql working, so i can use that for handling directory and qurl and networkaccess to do the down&uploads.
If someone feels like writing a up to date step by step for idiots manual on building the qftp lib i would be very happy..