如何呼叫外部程式 ??

bruce0829

有沒有哪位長官知道 Lazarus 在 Linux 下如何呼叫外部程式 ??
謝謝


■在 Kylix 3 C++ 程式中如何呼叫外部程式

system("reboot"); 執行重開機
system("poweroff"); 執行關機
system("/home/mytest/Project1"); 執行另一支 Kylix開發的 AP
(以上方法只能執行 有GUI畫面或不需GUI畫面的程式,

猫工

在win下试过，我记得我在社区发过DEMO，linux下没试过

bruce0829

http://wiki.lazarus.freepascal.org/Executing_External_Programs

不過要達到我要求的功能還要再 try 一下 .. 像是必須以 sudo 才能啟動的 power off 或 shutdown

涛

看系统吧，在Fedora下可以直接使用halt,reboot。而Ubuntu则要sudo

gabtech

Use
  OpenDocument(Filename);
or
  OpenURL(FileName);

Both in unit LCLIntf (at least in Lazarus 0.9.29)

gabtech

Use  OpenDocument(Filename); or  OpenURL(FileName);
Both in unit LCLIntf (at least in Lazarus 0.9.29)

gabtech

用OpenDocument(Filename);或OpenURL(FileName);在unit LCLIntf (Lazarus 0.9.29)

bruce0829

傷腦筋之處正是 sudo 後還要輸入 root 密碼 ....
偶的收銀機程式總不能在交班清機後, 準備關機的程序中, 要收銀員輸入 root 密碼才能關閉收銀機吧 ??  XD ...

bruce0829

Linux 跟 Windows 差異還挺大的, 寫程式外還需懂一些作業系統特性,
不是拿 Windows 那套來照抄就可以 ....


關於如何關機不用 root 密碼, 網路找到兩個方法
How to shutdown and reboot without sudo password?

there are two ways to do that (Any other ways available?)
1. Adding suid mode to /sbin/shutdown
By adding suid mode to shutdown command, you are allowing regular user to run shutdown command as root.
sudo chmod u+s /sbin/shutdown
Now you can run shutdown without needing sudo.


2. Modify /etc/sudoers with visudo
This seems to be proper way to allow a command to run as root from specified users without needing to type password.
sudo visudo
By running visudo, it leads to edit /etc/sudoers.
Adding the line below to that file, assume mysurface is the user that allow to shutdown without password.
mysurface ALL = NOPASSWD: /sbin/shutdown
For ubuntu, usually the default user is in the %admin group. Therefore, you can also allow all users from the %admin group to shutdown without password.
%admin ALL = NOPASSWD: /sbin/shutdown
In fact, you still need sudo to shutdown, but this time you do not need to specified password.
sudo shutdown -h now
You can also reboot the system by using shutdown command too.
sudo shutdown -r now

bruce0829

至於如何在 unbuntu 下自動登入 (如為了要執行 POS 程式), 那就很簡單了
用 unbuntu 中的菜單, 有 GUI 式的設定功具