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當您開始 KDE 4 的開發時,通常您有三個選擇:
隨後的章節會描述這三種選擇。
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如果您在執行任何 KDE 4 應用程式時遇到錯誤,例如: Qt: Session management error: Could not open network socket QMutex::lock: Deadlock detected in thread -1241241936 或在運行 startkde 的時候卡住,請閱讀這篇文章來繞過這個問題。 |
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| 附註 |
使用這個方法需要 sux 工具(http://fgouget.free.fr/sux/sux-readme.shtml )。sux 在大多數發行版上都有提供。當然你也可以參考下一篇的 在普通的 shell 裡不用 sux文件。sux 可以讓您用一種干淨而簡潔的方式在切換到其他使用者帳號時隱式地管理 X 轉發(認證和顯示輸出)。
登錄時請輸入 sux - kde-devel
您的.bashrc腳本將幫助您正確地建立所有環境變量和其他相關配置。如果要啟動一個應用程式,只需簡單地輸入程式名稱;例如
kwrite
啟動 KDE 4 應用程式最簡單的方法是使用 su 登錄 kde-devel 使用者,然後從命令列啟動程式。請輸入以下文字登錄
su - kde-devel
然後,輸入你的密碼
export DISPLAY=:0
所有的環境變數和其他設定應該參照下面的連接設置正確.bashrc。如果想要啟動一個程式只需要簡單輸入程序的名字就可以了;例如
kwrite
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If you get errors about missing mimetypes or such, try the following:
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| 附註 |
The simplest way to run a KDE 4 application with SSH in your current desktop environment is to get an X-aware shell prompt as the kde-devel user like this:
ssh -X kde-devel@localhost
Now you can launch KDE apps as usual, for example:
kwrite
The two lines can be conveniently combined:
ssh -X kde-devel@localhost kwrite
Before anything serious can be done using this method, a passwordless login needs to be set up. To start, run the following command as the regular desktop user:
ssh-keygen -t rsa
Hit enter three times to accept the path of ~/.ssh/id_rsa and an empty passphrase. Now, copy the single line in ~/.ssh/id_rsa.pub that's printed after running this command:
cat ~/.ssh/id_rsa.pub
After that line is copied, ssh back into the kde-devel user and put the copied line in the file $HOME/.ssh/authorized_keys:
ssh -X kde-devel@localhost $HOME/kde/bin/kwrite \ $HOME/.ssh/authorized_keys
Paste in the line, save the file, and quit KWrite. Now try running KWrite again with the same SSH command; you shouldn't have to enter a password anymore:
ssh -X kde-devel@localhost $HOME/kde/bin/kwrite
Using a passwordless SSH login has certain security risks, so make sure you protect your ~/.ssh/id_rsa file by restricting access to it with
chmod og-xrw ~/.ssh/id_rsa(although the file should have these permissions when it is created) |
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| 警告 |
If you want to be able to launch apps more easily than running them with an SSH command from the command line, one way is to create .desktop files that ssh into the other account.
| This will only be useful if your desktop environment supports .desktop files, but at least KDE and GNOME do. |
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| 附註 |
You can start with an existing .desktop file as a template (like one from your desktop) or you can make one from scratch. The main idea is to prefix the command being run with this string:
ssh -X kde-devel@localhost $HOME/kde/bin/
A simple .desktop file that runs KWrite would have the following contents:
[Desktop Entry]
Categories=Qt;KDE;TextEditor;
Comment=
DocPath=kwrite/index.html
Encoding=UTF-8
Exec=ssh -X kde-devel@localhost /home/kde-devel/kde/bin/kwrite %U
GenericName=Text Editor
Icon=kwrite
InitialPreference=8
MimeType=text/plain
Name=KWrite (kde-devel)
Path=
StartupNotify=false
Terminal=false
TerminalOptions=
Type=Application
X-DBUS-StartupType=Multi
X-DCOP-ServiceType=non
X-KDE-StartupNotify=true
X-KDE-SubstituteUID=false
X-KDE-Username=
| Apps launched using SSH like this don't trigger the correct launch responses, so you probably want to disable "launch feedback" for your .desktop files |
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| 提示 |
| In order to create a .desktop file for a KDE 4 app by using this pattern, the app's package will have to have been installed into ~/kde/bin using the cmakekde command |
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| 附註 |
Instead of using a full-blown new virtual X for developing software you can use Xephyr to embed your KDE 4 session into your working KDE 3 or other X11 environment.
You can also do this with xnest, but as xnest cannot handle extensions like Render many people prefer Xephyr.
If you want to get a minimal KDE session up and running, just launch Xephyr (available in Kubuntu as xserver-xephyr; Gentoo users compile x11-base/xorg-server with USE="kdrive"):
Xephyr :1 -extension GLX &
You can now launch KDE:
su - $USER
export DISPLAY=:1
/path/to/kde4/bin/startkde-modified &
startkde-modified is a copy of the startkde-script which includes the following lines on the top:
export KDEDIR=`kde4-config --prefix`
export LD_LIBRARY_PATH=$KDEDIR/lib
export PATH=$KDEDIR/bin/:$PATH
export KDEHOME=~/.kde4
You can also use Xephyr with KDM via the Xdmcp protocol and simply a new KDE 4 session to KDM.
On Kubuntu, you can enable it by changing
[Xdmcp]
Enable=false
in /etc/kde3/kdm/kdmrc to
[Xdmcp]
Enable=true
and adjust your /etc/kde3/kdm/Xaccess to allow your local machine access. Additionally you should make sure to set up a port blocking policy on all external interfaces for the Xdmcp port if you are doing this on a laptop or a PC in an untrusted environment.
If you are done, simply launch Xephyr:
Xephyr -query localhost :1 -host-cursor -screen 1024x768&
where -host-cursor tries to reuse the host's cursor and -screen sets the screen dimensions.
Note: If you get lots of refused connection errors, you might want to use the -ac option of Xephyr. For example:
Xephyr -ac :1&
Another option to try if you get lots of refused connection errors is you may need to grant assess to your kde-devel user to your X server. As root or using sudo execute:
xhost +local:kde-devel
If you do not have Xephyr, you can also use Xnest:
Xnest -ac :1& export DISPLAY=:1
| This section needs improvements: Please help us to
cleanup confusing sections and fix sections which contain a todo |
I use this for my start script nested_kde4.sh:
#! /bin/bash
NESTED_KDE_DISPLAY_BACKUP=$DISPLAY
export DISPLAY=:0
Xephyr :1 -screen 1024x768 &
export DISPLAY=:1
$HOME/kde/bin/startkde-modified &
export DISPLAY=${NESTED_KDE_DISPLAY_BACKUP}
If you run into
"Call to lnusertemp failed (temporary directories full?). Check your installation."
try this:
mkdir /var/tmp/kde-devel-kde4
The above code assumes you work with user kde-devel.
To run a full KDE 4 desktop environment session, you can either start it from the command line as you normally would, with something like this:
X :1 & export DISPLAY=:1 startkde
| If the X server refuses the connection saying something like: Xlib: connection to ":1.0" refused by server, try X -ac :1 instead. |
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| 附註 |
or you can can add it to your login manager. If you are using KDM (or a compatible login manager) this is done by creating a .desktop file in either `kde-config --prefix`/share/apps/kdm/sessions/ or in /usr/share/xsessions/. The easiest thing to do is to copy an existing kde.desktop file and name it kde4.desktop. Open this new .desktop file in a text editor and change the Exec, TryExec and Name entries to look something like this:
Exec=$HOME/kde/bin/startkde
TryExec=$HOME/kde/bin/startkde
Name=KDE4
Replace $HOME/kde in the example above with the prefix you are installing KDE4 into.
After restarting the login manager (Alt+e in KDM) this new entry should appear in the sessions menu.
You might have to edit your startkde scripts, ie: change
this
kdehome=$HOME/.kde
to this
kdehome=$HOME/.kde4
or paste this
export KDEDIR=`kde4-config --prefix`
export LD_LIBRARY_PATH=$KDEDIR/lib
export PATH=$KDEDIR/bin/:$PATH
export KDEHOME=~/.kde4
on top.
| You should have path to 'qdbus' program (usually it is $QTDIR/bin) in your $PATH to login successfully. If it is not there, you'll get an error message "Could not start DBus. Check your installation." |
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| 附註 |
This section will explain how to use KDevelop 3.4 to develop KDE 4 applications. If you have any questions, corrections or rants about this section, please post them on the discussion page.
You need at least KDevelop 3.4 for this, which is still a KDE 3 application. Versions lower than 3.4 do not have Qt 4 support among other things. The KDE 4 version of KDevelop is not yet ready for serious development. You can get KDevelop at the KDevelop homepage. Make sure you install KDevelop like all other KDE 3 applications, not with your kde-devel user.
You also need the lastest GDB version, which is currently 6.6.0. Note that the GDB version which is shipped with openSuse 10.3 is broken, it constantly crashes when examining variables (which KDevelop does automatically). Use the GDB version from this repository instead.
You need to have the kdelibs API documentation locally, which is described in the build instructions.
You also need ctags, htdig, htmerge and htsearch. valgrind and callgrind can also be useful.
Be sure you followed the steps in the KDE 4 build instructions and have a working KDE 4 environment. Make sure simple KDE 4 applications like Konsole or KWrite can be started from the command line of the kde-devel user without problems.
The following steps are all done with the kde-devel user. You need to login as that user by typing
su - kde-devel
KDevelop has no native support for CMake projects. Fortunately, CMake has the ability to generate KDevelop project files itself. In order to do this, you need to pass the -GKDevelop3 flag to the cmake command. This tells CMake to generate project files for KDevelop alongside the normal makefiles. The best way to do this is to modify your cmakekde function in your .bashrc. Just change
cmake $srcFolder -DCMAKE_INSTALL_PREFIX=$KDEDIR \
-DCMAKE_BUILD_TYPE=debugfull&& \
make && \
make install;
to
cmake $srcFolder -GKDevelop3 -DCMAKE_INSTALL_PREFIX=$KDEDIR \
-DCMAKE_BUILD_TYPE=debugfull&& \
make && \
make install;
After you have done that, re-login so that the changes to the .bashrc file take effect. Then you need to rerun cmakekde in the (root) build directory of the project you want to work on with KDevelop (if you didn't use -GKDevelop3 on the building step). For example, if you want to work on Konsole, which lives in kdebase, you need to run cmakekde in the $KDE_BUILD/KDE/kdebase directory. This unfortunately completely rebuilds everything, but only once when you change the generator.
Since all environment variables of the kde-devel user are KDE 4 specific, these need to be set back to match your KDE 3 environment before starting KDevelop. A simple way to do this is to add the following function to your .bashrc:
function start3app {
mkdir -p /tmp/$USER-kde export PATH=/opt/kde3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11:/usr/games export LD_LIBRARY_PATH= export KDETMP=/tmp/$USER-kde export KDEVARTMP=/var/tmp/$USER-kde export KDEHOME=$HOME/.kde export KDEDIR=/usr export KDEDIRS=$KDEDIR export DISPLAY=:0 eval "$@" source $HOME/.bashrc #Reset environment variables again
}
The PATH and LD_LIBRARY_PATH variables are taken from the KDE 3 user, and they may be different on your system. Type echo $PATH and echo $LD_LIBRARY_PATH as normal KDE 3 user to get these values. The above function assumes that KDE 3 is installed in the /usr prefix, as it is the case on Debian-based systems. If your KDE 3 is installed to a different prefix, you need to change the line setting KDEDIR accordingly. Here's an example how you find out your KDE installation prefix; in this example it is /opt/kde3:
kde-config --prefix
/opt/kde3
Now you should be able to start KDevelop by typing start3app kdevelop. Do that now.
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You can start any KDE 3 application with the start3app function. Useful candidates include Kompare and kdesvn. However, you can not start KDbg this way to debug KDE 4 applications, since then the environment variables for the debugged application are wrong. |
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| 提示 |
Symptome: kdevelop says "cannot talk to klauncher". You cannot open a file.
Solution: add your KDE library path to LD_LIBRARY_PATH, e.g.:
export LD_LIBRARY_PATH=/opt/kde3/lib
Now that KDevelop has started, you need to adjust a few settings. Go to Settings->Configure KDevelop...->Documentation for this. Remove all entries that are not relevant to KDE 4 coding.
| Although environment variables like $HOME are used in this section, you should replace them with real paths because KDevelop does not resolve environment variables. |
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| 附註 |
Optionally, you can add the kdelibs API documentation. You must create it beforehand. Then add the documentation by clicking Add.... In this dialog, use the following settings:
Now add the Qt API documentation, which also must be created beforehand, using the following settings:
After you have added kdelibs and Qt API documentation, make sure all checkboxes (TOC,Index and Search) are enabled. Then, go to the Full Text Search tab and make sure the paths to the htdig, htmerge and htsearch executables are correct. You can then close the settings dialog.
Now it is time to open the project you want to work on by clicking Project->Open Project.... The project files are located in the build directory. For example, if you want to work on Konsole, you need to open $KDE_BUILD/KDE/kdebase/apps/konsole/konsole.kdevelop. You now need to adjust a few project-specific settings in Project->Project Options. You need to do this every time you start to work on a different project.
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Sometimes, a KDevelop project file is not present for the folder you want to work on. This can have several reasons, it depends on how the CMake files are written. Usually, CMake files which have a project(projectname) statement in them should work fine. Once you are familiar enough with CMake, you can try adding the statement. A workaround for this is to simply use the KDevelop project file of the parent folder, or even higher. In this case, you need to use the Make Active Directory entry in the context menu of the File Selector sidetab. With this, you can ignore the other unwanted folders when building and installing. |
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| 附註 |
| The Qt4 PCS Importer is only needed if you didn't install Qt4, i.e. you use it directly from the build directory. The drawback of using the Qt4 importer is that it doesn't show progress and the application seems to hang while it imports. The alternative is to use the Custom Directory PCS Importer for this too |
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| 附註 |
| Name | Value |
|---|---|
| KDEHOME | $HOME/.kde4 |
| PATH | $KDEDIR/bin:$QTDIR/bin:/usr/local/bin:$PATH |
| LD_LIBRARY_PATH | $KDEDIR/lib:$QTDIR/lib:$LD_LIBRARY_PATH |
| KDETMP | /tmp/$USER-kde4 |
| KDEVARTMP | /var/tmp/$USER-kde4 |
| KDEDIR | $HOME/kde |
| KDEDIRS | $KDEDIR |
| LD_BIND_NOW | 42 |
Now you have finished adjusting your project-specific settings. Now you should remove some plugins you do not need, in Settings->Configure Plugins.... I for example disable the following plugins:
Abbreviation Expansion, Code Snippets, Doxygen Support, Embedded Konsole, File Tree, Final Packaging Support, "Open with" Menu Addon, QuickOpen, Regular Expression Tester, Scripting, Security Checker, Shell Filtering and Insertion, Text Structure and Tools Menu Addition.
You should at least disable the bold ones.
Now, open any source file if none is open already. This will enable the Settings->Configure Editor... entry, where you need to set the tab options to match the tab style used by the project you are working on. The important settings are:
In the mainwindow, click the CTags tab on the bottom tabbar, then click the Regenerate button to create a CTags database for easier source code navigation.
Now you have completed all essential configuration, congratulations!
Refer to the KDevelop manual for general help using KDevelop. The following section will only deal with special cases for KDE 4.
KDE apps have many symbols, which means that you need a lot of memory to get a decent loading times for debugging. To quote a GDB developer: "I would be reluctant to debug KDE on something with <1GB RAM." If the stepping function of the debugger is slow for you, try the following tips:
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KDevelop does not yet support modifing the CMake build system. This means you can not use KDevelop to add or remove files from the project or to change any other aspect of your project's build process. You need to modify the CMake files by hand and then rerun cmakekde instead. Read the CMake tutorial to learn how to do this. |
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| 附註 |
| When you work on libraries, you first need to install them before you can test or debug your changes.
Since this is cumbersome and time consuming, you should create symlinks (ln -s) pointing from the build directory to the installation directory for all affected libraries. Often, even simple programs use libraries internally, for example the settings dialog of Konsole is really a library. |
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| 提示 |
This describes how to use Eclipse to develop KDE 4 applications. It has been tested with Eclipse Ganymed and SUSE Linux 11.1 but should work same or similar with every combination. As an example KDE application we use ktimetracker from the kdepim module, other applications short work analog.
Using this description you will be able to
svn co svn://anonsvn.kde.org/home/kde/trunk/KDE/kdepim
If you want to integrate the cmake build step into your build toolchain, you will need to
cat >/bin/eclipsebuild<<EOF cmake . && make -j4 && make install EOF chmod 777 /bin/eclipsebuild
To revert what eclipse did to your project simply run
rm -rf .externalToolBuilders/ .project .cproject
When using eclipse's svn plugin and building a KDE program, you will get error messages complaining that your svn binary is too old. If you want to try and change this, here's how you get to that error:
這裡說明如何使用 Qt Creator 開發 KDE 4 應用程式。It has been tested with QtCreator 1.2.80 and SUSE Linux 11.1 but should work same or similar with every combination.我們使用來自 kdepim 模塊的ktimetracker作為 KDE 應用程式的範例。
我們使用 ktimetracker 作為範例專案。
File -> Open -> kdepim/CMakeLists.txt.
Projects -> ktimetracker -> build settings -> Add a configuration ktimetracker.
As build directory choose /home/youruser/kdepim/ktimetracker. As arguments for cmake use ...
想要開始一個新的專案你需要告訴 Qt Creator 建構時使用 KDE 程式庫。因此,選擇 File -> New... 並創建您的專案。在這裡我們稱為yourproject。為了能夠使用 KDE 程式庫,在你的家目錄,cd 進入yourproject並修改 yourproject.pro。加上
LIBS += -lkdeui