Unresolved Functions While Working With QSslSocket

Question

I tried to run a simple program that is written with Qt and uses QSslSocket.

I'm running this program on a Ubuntu 12.04 machine with OpenSSL installed.

But I got the following errors:

QSslSocket: cannot call unresolved function SSLv3_client_method
QSslSocket: cannot call unresolved function SSL_CTX_new
QSslSocket: cannot call unresolved function SSL_library_init
QSslSocket: cannot call unresolved function ERR_get_error

How can I fix these errors?

Try to copy `libcrypto` and `libssl` to location from where you start the app — maverik, Jun 01 '12 at 08:10

score 35 · Answer 1 · answered Jan 31 '16 at 18:17

35

On Windows/MinGW you need to copy these files to your exe directory.

C:\Qt\Tools\mingw492_32\opt\bin\libeay32.dll
C:\Qt\Tools\mingw492_32\opt\bin\ssleay32.dll

Or you can copy them to C:\Qt\Tools\mingw492_32\bin if you want it to work with all your apps. Obviously you need to distribute them with your program.

You actually don't need to add QT += network.

answered Jan 31 '16 at 18:17

Timmmm

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That's why I love SO. For your reference, the latest Qt/MinGW have these DLLs in the `\Qt\Tools\mingw530_32\opt\bin`. – Neurotransmitter Jan 20 '17 at 21:00
Interesting is dll files must be exactly in the exe directory, adding to working directory doesn't work. – Ali Dec 02 '18 at 09:05

score 13 · Accepted Answer · answered Jun 01 '12 at 08:25

13

Install the latest openSSL version. yum install openssl ,yum install libssl-dev..

And add QT += network in your .pro file

Source:http://codeblog.vurdalakov.net/2009/11/solution-qsslsocket-cannot-call.html

answered Jun 01 '12 at 08:25

ScarCode

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Where is `.pro` file located ? I am using Qt with VisualC++ – Chintan Soni Oct 25 '13 at 09:05

score 3 · Answer 3 · answered Sep 05 '13 at 19:15

3

I had the same problem with QT 5.0.1 and QT 5.1.1, and finally I realized I need to copy OpenSSL DLL files next to the application binary file. For some reason QT do not load the DLL files from Windows Path ...

I've used OpenSSL Win32 0_9_8y

answered Sep 05 '13 at 19:15

Roozbeh Zabihollahi

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score 3 · Answer 4 · answered Oct 17 '13 at 12:39

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For Ubuntu or (Debian based Linux) install openssl and libssl-dev

i.e. sudo apt-get install openssl libssl-dev.

For Red Hat , Fedora , CentOS (rpm based linux) install openssl and openssl-devel

i.e. yum install openssl openssl-devel

answered Oct 17 '13 at 12:39

Ajinkya Bhosale

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score 2 · Answer 5 · edited Aug 03 '18 at 07:50

2

I downgraded OpenSSL to version 1.0 and it worked.

edited Aug 03 '18 at 07:50

anothernode

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answered Aug 03 '18 at 05:51

Hieu.Gi

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score 1 · Answer 6 · answered Jun 01 '12 at 08:09

1

You need to include this file:

 #include <QtNetwork>

And in your .pro file, add this line:

 QT += network

answered Jun 01 '12 at 08:09

laurent

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Thank u ! But If I hadn't done these steps, I couldn't even use QSslSocket itself. – s4eed Jun 01 '12 at 16:04
2

You can use `QSslSocket` without `+= network` - if you use `QWebView`. That said, the problem isn't caused by the lack of `+= network`; it is because of the missing OpenSSL DLLs. – Timmmm Jan 31 '16 at 18:17

score 0 · Answer 7 · answered Nov 23 '16 at 20:37

0

Installing lua-openssl package on debian seems to have solved the issue for me.

answered Nov 23 '16 at 20:37

AdvancedNewbie

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Unresolved Functions While Working With QSslSocket

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