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有意思的腾讯面试

披星戴月 — Wed, 23 Sep 2009 09:35:00 GMT

摘要: 上周末去腾讯面试�Q�跟一个技术�h员聊�Q�聊到如何通过WAP接入点连接网�l�时�Q?

T�Q�说说通过WAP接入点连接一个服务器的过�E��?
W�Q�初始化WinSock库－调用socket()创徏一个socket,调用connect�q�接10.0.0.172服务器，然后发送一个CONNECT��h��q�接目标服务�?..(被打�?.
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披星戴月 2009-09-23 17:35 发表评论

Dev Tools

披星戴月 — Fri, 28 Aug 2009 14:43:00 GMT

astyle
Artistic Style is a reindenter and reformatter of C, C++, C# and Java source code.

autoconf
Development version of the automatic configure script builder.

automake
A tool for generating GNU-compliant Makefiles.

bashdb
Debugger for bash scripts

cppcheck
A tool for static C/C++ code analysis

doxygen
A documentation system for C++, C, Java, Objective-C, IDL and to some extent PHP, C# and D.

gcc-tools-autoconf
automatic configure script builder

gcc-tools-automake
a tool for generation GNU-compliant Makefiles.

git
Fast Version Control System

glib-devel
Gnome C function library

indent
C/C++ language source code formatting program

libiconv
GNU character set conversion library and utilities.

libjpeg-devel
A library for manipulationg JPEG image format files.

libpng
PNG library.

pcre-devel
Perl-Compatible Regular Expressions.

披星戴月 2009-08-28 22:43 发表评论

gflags - a debugging story

披星戴月 — Tue, 14 Jul 2009 04:47:00 GMT

I hate crashes that disappear when run under the debugger and I had one when
porting mupdf to Windows.

It helps to know that there’s at least one reason for a changed behavior under
the debugger: it automatically triggers using debugging heap. While debugging
heap usually helps find problems, sometimes it does the opposite by changing
the details of memory allocation.

One helpful tool when debugging memory problems on Windows is gflags which can
enable page heap instrumentation for a given program. It works by putting each
allocation into a separate region of memory and putting a non-readable page
right after that. Also, upon freeing it makes the memory unreadable. That way
an overwrite of memory block while it’s still being used or accessing the
memory after it was freed will cause immediate crash.

The downside is that using gflags uses much more memory. But in those days of
cheap gigabytes it’s not a problem that can’t be solved with a couple hundred
bucks.

Basic usage of gflags.exe is simple:
gflags /p /full /enable foo.exe

From now on foo.exe will always be run with this instrumentation turned on. To
disable, do
gflags /p /disable foo.exe

To see which programs have page heap enabled, do gflags /p. gflags offers many
other option and you can learn about them via gflags /?. If you run gflags
without any options, you’ll get a (very confusing) GUI.

It worked like a charm. I got a crash on accessing freed memory and all I had
to do was to backtrack to where this memory was allocated to figure out the
problem.

reference: http://blog.kowalczyk.info/article/gflags-a-debugging-story.html

披星戴月 2009-07-14 12:47 发表评论

使用vs2005(vc8)�~�译log4cpp-0.3.5rc3

披星戴月 — Sun, 13 Apr 2008 14:22:00 GMT

问题�Q�由于log4cpp-0.3.5rc3仅提供了vc6的工�E�文�Ӟ��因此�Q��用vs2005打开后，需要进行�{换。但是�{换后�Q�不能正��编译，提示Custom Build Step时出��C��错误�?

分析�Q�因为log4cpp在生成NTEventLogAppender.dll�Ӟ��需要连接NTEventLogCategories.mc文�g。所以，��目讄��了自定义的生成步骤去生成NTEventLogAppender.dll。但从vc6的工�E�文件�{换时�Q�这些步骤却没有正确的�{换过来。从而出��C��q�问题�?/p>

解决�Ҏ��Q�重新填写Custom Build Step��V�?/p>

其中�Q�CommandLine填写以下内容�Q?/p>

if not exist $(OutDir) md $(OutDir)
"mc.exe" -h $(OutDir) -r $(OutDir) $(SolutionDir)NTEventLogCategories.mc
"RC.exe" -r -fo $(OutDir)\$(InputName).res $(ProjectDir)\$(InputName).rc
"link.exe" /MACHINE:IX86 -dll -noentry -out:$(OutDir)\NTEventLogAppender.dll $(OutDir)\$(InputName).res

Outputs填写�Q?(OutDir)\NTEventLogAppender.dll

适用范围�Q�log4cpp��目、log4cppDLL��目的Debug和Release配置。同�Ӟ��该方法适用于vs2003(vc7.1)�?/p>

原文出处�Q?br />http://www.shnenglu.com/ace/archive/2007/01/27/18050.html

披星戴月 2008-04-13 22:22 发表评论

big-endian和little-endian

披星戴月 — Thu, 06 Mar 2008 08:13:00 GMT

一个例子：
如果我们��?/span> 0x1234abcd 写入��C�� 0x0000 开始的内存中，则结果�ؓ:

                  big-endian   little-endian
0x0000          0x12            0xcd
0x0001          0x34            0xab
0x0002          0xab            0x34
0x0003          0xcd            0x12

披星戴月 2008-03-06 16:13 发表评论

披星戴月 — Mon, 10 Sep 2007 04:09:00 GMT

象如下定义就得到一个数�l�的引用
        �c�d��?�Q?amp;变量明）[N]�Q?br>
        实例
        int int_array[10];
        int (&int_ref)[10] = int_array;
        �q�样��得��C��一个数�l�的应用

        在函数的声明中用数组的引用定义，��׃��怕数�l�退化了。如�?br>        for_each( int (&int_ref)[10] )
        {
                 for( int i=0; i<10; ++i )
                         std::cout << int_ref[i] << std::endl;
         }

         int main( int argc, char* argv[] )
         {
                 int int_array[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }

                 for_each( int_array );
                 return 0;
          }

          在上面的代码中，如果你传入不�?0个尺寸的数组�Q�是�~�译通不�q�的。代码的安全性提高了�?nbsp;

         惌��定义一个数�l�引用类型，�Ҏ��如下
         typedef �c�d��?(&数组引用�c�d��?[N];

         实例
         typedef int (&Array_Ref)[10];
         Array_Ref��是一个数�l�的引用�c�d��了�?/p>

披星戴月 2007-09-10 12:09 发表评论

C++解析XML�Q�TinyXml

披星戴月 — Thu, 06 Sep 2007 04:22:00 GMT

摘要: TinyXml:
Homepage: http://www.grinninglizard.com/tinyxml/
Download�Q�http://sourceforge.net/projects/tinyxml 阅读全文

披星戴月 2007-09-06 12:22 发表评论