[ILDASM Boxing]從進一步瞭解Struct和Class的不同學到的

1. Struct與類的區別:(1)結構是實值型別,不是參考型別。(2)結構可以繼續介面,但是不可以繼承類或結構。(3)結構的構造方法的工作方式有所不同,只能聲明帶參數的構造方法,且不能聲明析構方法。(4)可以指定欄位如何在記憶體中布局。 (5) 使用。如下兩種方法都可以。但是切記:方法一的話,"Users user;" 並沒有調用建構函式初始化成員變數!!所以,總起來講,還是方法二好!以下為MSDN words:The struct type is suitable for

Run / Compile Against different dotNet Framework

Configure to make a app run against the same dotNet FrameworkFor every app, if it has assemblies that are built based on dotNet framework, then it can have a app.exe.config file to support a application level configuration for its running behavior.

ObjectARX AutoCAD的資料庫和實體結構

一、符號表 一副CAD圖形就是一個包含有多個表的資料庫,它規定了9個符號表(見下表),使用者不能再增加新的符號表 符號表名符號表功能 AcDbViewTable(視圖表) 適用於 AcDbViewTableRecord 類,表示在資料庫中儲存的視圖。視圖與CAD的"VIEW"命令相關聯 AcDbViewportTable(視口表) 適用於 AcDbViewportTableRecord 類,表示在CAD中當前系統變數TILEMODE的值為1時的視口設定。視口配置由CAD的 VPORTS

dotNet Assembly More Basic Understanding[anycpu 32bit/64bit assembly/executable/clr]

1. AnyCPUFirstly, there are 32bit/64bit CLR. For executables, it's up to the CPU bit to decide whether it will load as a 32/64bit process with corresponding CLR; for assembly, it's up to the process it's to be loaded into NOT the CPU or OS bit. 

Fusion App Basic Mechnism (updating)

We are developing a app called Fusion. It's a strange app, as: it's a MFC app while internally MFC app is just its clothes and it makes use of C++/CLI and mainly C# assemblies to do the real job. Its startup mechanism can be summarized as:1. Firstly,

Basic: GetModuleHandle / LoadString / Resource Embed

1. For a native C++ project in VS, once you create resource.h + res file in the project, you can manually add resources (forget about the stupid resource editor!). By default, the resources will be embedded into the module. Usually, we create

BAT很好很強大

cmd.exe下可以乾的事情,bat都可以幹,並且批量。幾點常用:1.  批次檔的參數批次檔還可以像C語言的函數一樣使用參數(相當於DOS命令的命令列參數),這需要用到一個參數表示符"%"。%[1-9]表示參數,參數是指在運行批次檔時在檔案名稱後加的以空格(或者Tab)分隔的字串。變數可以從%0到%9,%0表示批處理命令本身,其它參數字串用%1到%9順序表示。 2. IF ERRORLEVELIF ERRORLEVEL

[Tip]dotNet project Add Reference

We are so used to adding dotNet module references and project references, but rarely meet situations requiring adding other dotnet module directly. The Other dotnet module consists of 3 kinds:    --precondition of installing my app. Like installing

[Tip: log file]Some Quick Notes

1. Log File is important. I didn't realize its importance until I met a issue that was only reproducible on QA machine and it's hard for me to figure out the reason. I added some code in my project to output some check point status into a log file

[tip: commandline argument]Environment.GetCommandLineArgs

MSDN Returns a string array containing the command-line arguments for the current process. Input at the command lineResulting command line argumentsMyApp alpha betaMyApp, alpha, betaMyApp "alpha with spaces" "beta with spaces"MyApp, alpha with

Cross Platform Development Prethinking

As I am going to do cross-platform development, I can only see this is a prethinking based on my observation to other such teams.1. You still need to work on Windows in major time if you are familiar with windows in long time. Of course, if you have

print message to debug output window (VS)

Some times we could want to print the debug messages to a window (console or windows) or a file, we debug our programms with these information. There's a better way to debug programm, print the message to output window if you use VS, and you can

瞭解一點QT

QT作為cross platform開發中開發UI的利器,應用非常廣。可惜我的項目經曆裡沒碰到過它。今天的一次training,make a list瞭解一點關鍵概念先:1. QA widget是control也是window,因此可以單獨被show出來。2. 一些關鍵概念:  --QObject  --Meta Object System  --Signal-Slot  --UIC 

[tip]transparent bmp

一般情況下,需要透明背景圖片時,會首先想到icon檔案。但是,有些場合下,必須用其他格式比如bmp。透明背景的bmp叫做loose image,做法很簡單:1. 如果是從icon檔案轉換為bmp,可以用photoshop + icon plugin的組合。註:ps不能直接開啟icon檔案。2. 開啟icon檔案或建立一檔案,只包含你想要透明顯示的東西。3. 建立一新層,作為背景層,用油漆桶把(192,192,192)的rgb設在那一層上。4. 儲存為bmp。搞定。

[複習]時間複雜度及計算

一個演算法的複雜度通常由其時間複雜度和空間複雜度來表達。這裡,主要複習下時間複雜度的概念及計算。概念:時間複雜度即一個演算法所需運算的次數隨問題規模n變化的函數。常見時間複雜度及對應複雜度關係:c < log2N < n < n * Log2N < n^2 < n^3 < 2^n < 3^n < n!計算方法:  根本上有二:計算一個語句的頻度(執行次數)和時間複雜度。1)快速求解方法:看迴圈層數及對應迴圈次數。

dotNet Assembly Basic

dotNet Assembly basic (a overall topic Assemblies and the Global Assembly Cache can be found in MSDN)Assemblies have the following properties:Assemblies are implemented as .exe or .dll files.You can share an assembly between applications by placing

How to avoid StepInto unnecessary code area?

To avoid normal stepIntos, you can just put below text into a reg file and run it:Windows Registry Editor Version 5.00[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\8.0\NativeDE\StepOver]"CString StepOut"="CString.\\:\\:.*=NoStepInto""INV_STL

[複習]記憶體對齊

1. 概念:程式員眼中的記憶體是按byte儲存的;而cpu眼中的記憶體是以chunk為單位的,chunk可以是2,4,8bytes。如果放在記憶體中的資料沒有被對齊即其記憶體位址不是對應cpu記憶體訪問粒度的整數倍,讀取這段資料cpu就需要更多次的記憶體訪問,相比較對齊的記憶體資料而言。記憶體對齊後,佔據的記憶體必然是增多的。2. 最明顯的獲知有記憶體對齊這回事的例子是sizeof(struct a)。由於我們可以通過編譯選項#pragma pack(n)來控制資料的記憶體存放的對齊粒度(1,2

[tip]如何快速在一堆lib檔案中找到你所需要的函數的import library檔案

項目中碰到一個問題:所依賴的ObjectARX升級新版本之後,所用到的一些原本從acad.lib中匯出的函數現在在新版本的acad.lib中找不見了。那那些函數現在從哪個lib檔案匯出呢?ObjectARX裡包了一堆的lib檔案。當然,一個比較簡單並且比較有道理的做法是:根據lib檔案的名字選擇那些可能包含這些函數的lib檔案用dumpbin匯出其export

[Problem 14]歐拉

幾點:1. 在問題規模大的時候,一定要檢查選擇的資料類型是否夠用,會不會overflow。這裡的case就是一個很好的例子。我的演算法幾分鐘就寫好了,也蠻正確的,除了對於start num i及chain中的number n的資料類型選擇了int,這就導致在n被3n+1反覆搞大後,超出了int的範圍,變成了負數,也就進入了導致算不出結果來的死迴圈裡(因為永遠也算不到1了)。所以,切記:問題規模大的時候,一定仔細考慮清楚資料類型的選擇。2. unsigned

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