[Qt-interest] 答复: 答复: 答复: 答复: plugins directory

[pengliang(彭亮)]

I have not installed Qt-4.5.3 and Qt-4.7.1, I only copy their libraries to /usr/local/Trolltech/.

LD_LIBRARY_PATH is "/usr/local/Trolltech/Qt-4.5.3",

When I renamed /usr/local/Trolltech/Qt-4.5.3 to Qt-4.5.3333, it’s ok. So I think the program search the libraries in the program’s path(like qt-assistant said). Because of Qt-4.5.3 does not exist and LD_LIBRARY_PATH is Qt-4.5.3.

But I renamed /usr/local/Trolltech/Qt-4.7.1 to Qt-4.7.1111, it can not work. 

 

> [incam at incam04 plugins]$ cd sqldrivers/

> [incam at incam04 sqldrivers]$ ls

The plugin library exists, but against which version of Qt are they built? 4.7.1 ? Then they won't load with 4.5.3

> libqsqlite.so  libqsqlmysql.so          ß-  library exist.

> [incam at incam04 sqldrivers]$

It is built on Qt-4.7.1.

 

Please see the picture bellow: I think the problem is libqsqlmysql.so. I built it on Qt-4.7.1, and I ran “ldd libqsqlmysql.so”, 

Why it indicated the path of libQtSql.so.4 is “/usr/local/Trolltech/Qt-4.7.1/lib/libQtSql.so.4”?

Whether it means I must ensure the directory of “/usr/local/Trolltech/Qt-4.7.1” exist? If like this, it does not accord with “How to Create Qt Plugins” in Qt-assistant.

 

 

Thanks

Ken

 

-----邮件原件-----
发件人: qt-interest-bounces+pengliang=founder.com at qt.nokia.com [mailto:qt-interest-bounces+pengliang=founder.com at qt.nokia.com] 代表 Samuel Gaist
发送时间: 2010年12月23日 17:14
收件人: qt-interest at qt.nokia.com
主题: Re: [Qt-interest] 答复: 答复: 答复: plugins directory

 

 

On 23 déc. 2010, at 09:42, pengliang(彭亮) wrote:

 

> Hi

>    I am sure I have installed the mysql client library.

>  

> Untitled2 has compiled on Qt-4.7.1.  Please see the source code in attached file.

>  

> when I rename /usr/local/Trolltech/Qt-4.7.1 to Qt-4.7.11111  ,it can not work.

> [incam at incam04 ~]$ cd /gerfile/ken/test/

> [incam at incam04 test]$ ls

> accessible  bearer  codecs  designer  graphicssystems  iconengines  imageformats  inputmethods  lib  plugins  script  sqldrivers  untitled2

> [incam at incam04 test]$ ./untitled2

> "/gen_db/gerfile/ken/test/lib"

> "/gen_db/gerfile/ken/test/plugins"

Look at the line below:

> "/usr/local/Trolltech/Qt-4.5.3/plugins"

The library used (and hence the plugins that are loaded) are from this version of Qt you installed: the 4.5.3

Was that version build with MySql support ?

> "/gen_db/gerfile/ken/test"

> QSqlDatabase: QMYSQL driver not loaded

> QSqlDatabase: available drivers: QSQLITE

> false open

> [incam at incam04 test]$ cd plugins

> [incam at incam04 plugins]$ ls

> accessible  bearer  codecs  designer  graphicssystems  iconengines  imageformats  inputmethods  sqldrivers

> [incam at incam04 plugins]$ cd sqldrivers/

> [incam at incam04 sqldrivers]$ ls

The plugin library exists, but against which version of Qt are they built ? 4.7.1 ? Then they won't load with 4.5.3

> libqsqlite.so  libqsqlmysql.so          ß-  library exist.

> [incam at incam04 sqldrivers]$

>  

> [/snip]

Hope this helps

Samuel

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