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C++

淺析C++中虛函數的調用及對象的內部布局

在我那篇《淺析C++中的this指針》中,我通過分析C++代碼編譯后生成的匯編代碼來分析this指針的實現方法。這次我依然用分析C++代碼編譯后生成的匯編代碼來說明C++中虛函數調用的實現方法,順便也說明一下C++中的對象內部布局。下面所有的匯編代碼都是用VC2005編譯出來的。雖然,不同的編譯器可能會編譯出不同的結果,對象的內部布局也不盡相同;但是,只要是符合C++標準的編譯器,編譯結果和對象的內部布局應該是大同小異。首先,是一個有著簡單繼承關系的兩個類

系統 2019-08-29 23:30:45 3054

C++

從C/C++語言到Objective-C語言

無標題文檔原文鏈接:http://www.yifeiyang.net/iphone-development-introduction-7-from-the-c-c-language-to-objective-c-language/Objective-C,通常寫作ObjC和較少用的ObjectiveC或Obj-C,是擴充C的面向對象編程語言。所以有一定C/C++語言基礎理解和掌握Objective-C也會相應的快些。這回,我們將比較著學習Objective-

系統 2019-08-12 09:30:10 3048

C++

c++中調用cygwin/x使用ncl

1.C++中調用程序:ShellExecute(NULL,L"open",L"cmd.exe",L"/cd:&cdcygwin&cygwin.bat",L"D:\\cygwin\\",SW_HIDE);2.修改cygwin.bat:@echooffD:chdirD:\cygwin\binbash--login-i改成:@echooffsetCYGWIN=binmodettyntsecD:for/f%%iin('tasklist')doif/i%%i==XW

系統 2019-08-12 09:27:06 3048

C++

C++轉向C#的疑惑:難道C#中沒有拷貝構造函數 ?

不可否認,C++在過去十年乃至現在一直都是windows平臺上的主流開發語言,而來勢兇猛的.NET勢必開辟一個嶄新的局面,從目前的種種跡象來看,.NET是大勢所趨,而C#作為.NET平臺上的第一開發語言自然備受關注,于是有很多程序員紛紛轉向C#,這其中當然不乏C++程序員。情況往往是這樣,從一種語言過渡到另一種語言,哪怕是比較相似的語言,程序員也經常無意識地陷入原開發語言的思維定勢,這樣的結果通常只有一個,那就是導致連程序員自己也始終想不通的錯誤。本文由某

系統 2019-08-29 22:37:25 3034

C++

C/C++內存分配方式,棧區堆區 new/delete/mallo

http://blog.csdn.net/rujielaisusan/article/details/4622197內存分配方式內存分配方式有三種:[1]從靜態存儲區域分配。內存在程序編譯的時候就已經分配好,這塊內存在程序的整個運行期間都存在。例如全局變量,static變量。[2]在棧上創建。在執行函數時,函數內局部變量的存儲單元都可以在棧上創建,函數執行結束時這些存儲單元自動被釋放。棧內存分配運算內置于處理器的指令集中,效率很高,但是分配的內存容量有限。

系統 2019-08-12 01:33:52 3032

C++

Kinect SDK C++ - 2. Kinect Depth Data

TodaywewilllearnhowtogetdepthdatafromakinectandwhattheformatofthedataiskinectcodekinectInitializationTogetthedepthdatafromthekinect,simplychangetheargumenttoNuiImageStreaOpen().TheFirstargumentisnowNUI_IMAGE_TYPE_DEPATH,tellingthe

系統 2019-08-12 01:33:19 3032

C++

C++和JNI的數據轉換

如何使用JNI的一些基本方法和過程在網上多如牛毛,如果你對Jni不甚了解,不知道Jni是做什么的,如何建立一個基本的jni程序,或許可以參考下面下面這些文章:利用VC++6.0實現JNI的最簡單的例子JNI入門教程之HelloWorld篇SUNJNITutorial這些資料的例子中,大多數只是輸入一些簡單的參數,獲取沒有參數。而在實際的使用過程中,往往需要對參數進行處理轉換。才可以被C/C++程序識別。比如我們在C++中有一個結構(Struct)DiskI

系統 2019-08-29 22:30:50 3016

C++

專家書單推薦:C++藏書閣

本文轉載自:http://news.csdn.net/n/20060829/94184.html選擇現在來推薦C++圖書,看似蹊蹺,實則是有原因的。我們的專欄去年初從Java圖書開始,一年多的時間里始終對C++觸及甚少。C++程序員出身的我,已經受到了不少好友和讀者的質疑。去年是C++誕生20周年(從1985年第一個商業實現的發布算起),世界各地包括國內都舉行了不少活動,當時本來已經動筆寫了一個初稿,也想來個獻禮,但是稿成之后,看看又不滿意,加之俗務纏身,

系統 2019-08-29 23:16:51 3014

C++

C++學習筆記(四)--虛函數表解析

C++中的虛函數的作用主要是實現了多態的機制。關于多態,簡而言之就是用父類型別的指針指向其子類的實例,然后通過父類的指針調用實際子類的成員函數。這種技術可以讓父類的指針有“多種形態”,這是一種泛型技術。所謂泛型技術,說白了就是試圖使用不變的代碼來實現可變的算法。比如:模板技術,RTTI技術,虛函數技術,要么是試圖做到在編譯時決議,要么試圖做到運行時決議。關于虛函數的使用方法,我在這里不做過多的闡述。大家可以看看相關的C++的書籍。在這篇文章中,我只想從虛函

系統 2019-08-29 23:23:29 3011

C++

【譯】C++ 內存池 -- C++ Memory Pool .

轉自:http://blog.csdn.net/060/article/details/1326025這是我翻譯的文章,來自CodeProject,原文作者:DanDanger2000.原文鏈接:http://www.codeproject.com/cpp/MemoryPool.aspC++內存池l下載示例工程–105Kbl下載源代碼–17.3Kb目錄l引言l它怎樣工作l示例l使用這些代碼l好處l關于代碼lToDol歷史引言C/C++的內存分配(通過mal

系統 2019-08-29 23:01:17 3008

C++

C++中malloc/free和new/delete 的使用

malloc/free的使用要點函數malloc的原型如下:void*malloc(size_tsize);用malloc申請一塊長度為length的整數類型的內存,程序如下:int*p=(int*)malloc(sizeof(int)*length);我們應當把注意力集中在兩個要素上:“類型轉換”和“sizeof”。*malloc返回值的類型是void*,所以在調用malloc時要顯式地進行類型轉換,將void*轉換成所需要的指針類型。*malloc函數

系統 2019-08-12 01:54:43 3008

C++

用 VC++ 2005 建立ActiveX 分步走

如何使用VC++2005創建一個ActiveX控件呢,請聽我慢慢道來。首先選擇新建項目,選擇VisualC++MFC->MFCActiveX控件輸入項目名稱,本例子我們起名為FActiveX,點擊確定。在控件設置中僅選中運行時不可見,然后選擇完成。到此一個完整的ActiveX框架就已經搭成了,VC2005為我們生成了所有必須的文件,現在你就可以編譯一下了,應該沒有任何的錯誤和警告,否則就可能是你的開發環境有問題了。在工程目錄里的Debug子目錄下已經生成了

系統 2019-08-12 09:30:01 3003

C++

注冊表操作類 vc++

這個其實發在這里有點不合適,因為在.NET環境下本身很多數據都采用xml格式化,存儲在本地,另一方面是.net的類庫也非常的靈活,對注冊表操作非常方便,沒有必要畫蛇添足來這么一個包裝的類,但是如果你用vc++,WIN32API,做開發的時候,你會發現要對注冊表操作非常的困難,更讓人寒心的是,它居然沒有提供對注冊表鍵的重命名,在NTDLL.dll中有一個可以替代的API:NTRenameKey,但是它只有winXP之后的操作系統才提供,所以,筆者在這里提供這

系統 2019-08-29 22:24:45 3002

C++

[C++]MySQL數據庫操作實例

由于課程大實驗需要使用c++操作MySQL數據庫,經過一番研究終于成功實現VS2008中與MySQL的連接。環境設置:安裝完MySQL之后,將安裝目錄中的MySQL5\lib\debug\目錄下的libmysql.lib文件拷到VS2008安裝目錄中的VC\lib\下,然后在項目-選項-c/c++-常規中的附加包含目錄以及鏈接器-常規中的附加庫目錄中加入“c:\MySQL\include\”,并且在鏈接器-輸入中的附加依賴項內添加“libmysql.lib

系統 2019-08-12 09:30:27 2986

C++

c++封裝Word (比較全了)

小魚兒C++處女作(vcword操作封裝)本人先聲明這個程序是參考了汪自軍封裝類來寫的。如果程序對你有所幫助,我將感到很榮幸。。期末到了希望大家都不要掛科哦,反正我只有英語考了,貌似及格沒有壓力啊。。。。程序代碼:#ifndefCMYWORD_H#defineCMYWORD_H#include"msword.h"#include//段落對齊的屬性enumAlignment{wdAlignParagraphCenter=1,wdAlig

系統 2019-08-12 09:27:10 2983

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