雲端計算技術與應用研討會（一）：The future in the cloud - 上雲端看未來

2010年11月30日09：30→10：20
演講者：葉平，Google 台灣雲端計算主持人

    Cloud 的概念已經三年了，也成熟了。相較於過去的網路架構，Cloud 提供了 unlimited resources；所有的資源都是動態佈建的。

    在未來，人人手邊可能不只一機（手機→Pad→Laptop→TV→PC）。而網路就提供了一個方法讓各種資源來溝通。而在機體越來越小的情形下，Cloud Computing 就越來越重要。機體就可以使用網路，使用網路的計算資源；使得手機可以越做越小，而不失其運算能力。

Transfer file from Windows with SSH to Ubuntu

This will tell you how to transfer files from Windows to Ubuntu.

1) Download SSH client programs
    Here, I'm using Putty as the client of Windows side.  Download All binary is recommended.  We will use PSCP to transfer file.

2) Extract all putty binary to somewhere.  Add "C:/Path/To/All/Putty/Binary" to My Computer/Environment variable/Path .  So that we can use the command line to upload file.

3) Install ssh by typing:

sudo apt-get install ssh

.

4) Open cmd of the Windows, use following command to transfer file to Ubuntu computer

pscp [-r] <source file path> <name>@<IP><destination path from ~ >

Using wxWidgets with Code::Blocks, problem's about "Undefined reference to 'vtable for XXXX' "

According to this post, the reason of linking error " Undefined reference to 'vtable for XXXX' " is due to some of the virtual function is not written.  Especial from the inherent one.

But with Code::Blocks, there is another possibility that could leads the problem.  After some research, I discovered a quick to fix the problem, especially the problem is not cause from you but the library.

Code::blocks in Linux may automatically call some program to get config.  For example: run following on the terminal:

$wx-config --libs
-L/usr/local/lib -pthread   -lwx_gtk2u_xrc-2.9 -lwx_gtk2u_html-2.9 -lwx_gtk2u_qa-2.9 -lwx_gtk2u_adv-2.9 -lwx_gtk2u_core-2.9 -lwx_baseu_xml-2.9 -lwx_baseu_net-2.9 -lwx_baseu-2.9 


This is a result from my computer.  According to 'wx-config --help', the default output of this parameter is the basic, standard of the linkers.  In other word, some special library is not included.


Instead using 'wx-config --libs', you may try following:


$wx-cinfig --libs all
-L/usr/local/lib -pthread   -lwx_gtk2u_xrc-2.9 -lwx_gtk2u_stc-2.9 -lwx_gtk2u_richtext-2.9 -lwx_gtk2u_ribbon-2.9 -lwx_gtk2u_propgrid-2.9 -lwx_gtk2u_aui-2.9 -lwx_gtk2u_media-2.9 -lwx_gtk2u_html-2.9 -lwx_gtk2u_qa-2.9 -lwx_gtk2u_adv-2.9 -lwx_gtk2u_core-2.9 -lwx_baseu_xml-2.9 -lwx_baseu_net-2.9 -lwx_baseu-2.9 


Soon you may discovered that the number of the linker has increased.  This is the main reason that cause you mad.


To modify the setting, goto project properties... → Project build options → Linker Setting → Other linker options.

Change 'wx-config --libs' to 'wx-cinfig --libs all', and re-compile the project.