What is VB? What is VC? What is the difference between them?

VB is Visual Basic programming language

In 1991, Microsoft Corporation launched Visual Basic (which can be abbreviated as VB). The latest version is VB 2005 (VB8) Chinese version.

Visual is visible and visible, which refers to the development method of developing graphics user interface like Windows operating system (GUI). The appearance and location, just drag and drop the pre -established object to the corresponding position on the screen.

basic refers to the Beginners all_purpose symbolic code initials general symbolic instruction code language.

Visual Basic has three versions: learning, professional version and enterprise version to meet different development needs. The learning version is suitable for ordinary learners and most people using Visual Basic development general Windows applications. In addition to the content of the professional version, the enterprise version also has tools such as automated component managers, so that professional programmers can develop distributed applications in group bones with powerful functions.

VB is a visual, object -oriented, and structured high -level programming language that is used by event -driven methods, which can be used to develop various applications in the Windows environment. It is simple and easy to learn, high efficiency, and powerful functions that can be comparable to WindowsR professional development tool SDK. In the Visual Basic environment, the program driven by event drive, novel and easy -to -use visual design tools, use a widely used application interface (API) function inside Windows to embed (OLE), open data connection (ODBC) and other technologies can efficiently and quickly develop application software systems with powerful and rich graphics interfaces in the Windows environment. With the improvement of the version, the function of Visual Basic has become stronger and stronger. After version 5.0, Visual Basic launched the Chinese version. Compared with the previous version, its functions have greatly improved.

At the beginning of the 21st century, Microsoft launched a major change between Visual Studio 2003 and Visual Basic. Visual Studio made a platform for various programming tools. Visual Basic.net can be here. Run on the platform. Compared to traditional VB, there are great differences. VB.NET, for the first time, uses the .NET architecture for visual programming, and can be well compatible with the COM framework. In 2005, Visual Studio 2005 used net 2.0 technology to facilitate the work of programmers. However, the new program also has high requirements for system configuration, and requires Microsoft .NET Framework 2.0 or above .NET framework support. rnrn另外VB(V代表Vitamin)还有一个意思：维生素Brnrn维生素B包括维生素B1、维生素B2、维生素B6、维生素B12、烟酸、泛酸、 Folic acid. These B vitamins are to promote metabolism in the body, and convert sugar, fat, protein, etc. into indispensable substances when heat. If vitamin B is lacking, the cell function will be reduced immediately, causing metabolic disorders. At this time, the human body will cause stagnation and loss of appetite. On the contrary, excessive drinking leads to liver damage, and in many occasions, it is in parallel with vitamin B deficiency.

The food with rich vitamin B:

① Foods rich in vitamin B1: wheat germ, pork leg meat, soybeans, peanuts, muscle, ham, black rice, black rice, black rice, black rice , Chicken liver, germ rice, etc.

② Foods rich in vitamin B2: Qiqi, beef liver, chicken liver, shiitake mushrooms, wheat germ, eggs, cheese, etc.

③ containing vitamin B6, vitamin B12, niacin, pantothenic acid, and folic acid: liver, meat, milk, yeast, fish, beans, egg yolk, nuts, spinach, cheese, etc. The vitamin B1 cannot be stored in the human body, so it should be added every day.

B of vitamins if you want to take all difficulties, but you can take it simply and conveniently to choose food. The above -mentioned foods containing vitamin B can be divided into two groups: ① and ② ③. Look at the above categories to understand, ② and ⑧ are all in general foods. Therefore, ① as a group of food, ② and ③ form a group of food together, and choose two sets of food in combination. Basically, the B vitamin can be taken into the hand.

VB also has the third meaning

The theory of price key
Valence-bond theory

Approach. Also known as electronic pairing method. The earliest development of chemical keys in history. The main description of the covalent bonds in the molecule and the common price, and its core idea is to form a domain chemical bond for electronic pairing.
It 1927 W.H. Heatler and F.W. London completed the quantum mechanics of electron -to -bonds in the hydrogen molecule for the first time, which is the basis of the modern price key theory. L.c. Bowin and others developed to introduce the concept of hybrid tracks, comprehensively the theory of price bonding, and successfully applied to the structure of bilateral molecules and multi -atomic molecules.
The theory of price keys is the promotion of hydrogen molecular methods in Heiteler London. To form a single state to form an electronic key. ② After the two electrons are paired with each other, they can no longer match the third electronic. This is the saturation of the covalent bond. ③ Follow the maximum overlapping principle. The covalent bonding is directional. Atomic orbit usually has a maximum value in a specific direction. Only in this direction can there be a maximum overlap and form a common price key. Different atomic orbit has different bonding capabilities. The maximum value of the atomic orbit is used as the measurement of atomic orbits. The ability to form atomic orbits such as S, P, D, F and other atomic orbits are 1, 3, 5, and 7. When the number of main quantum is the same, the covalent bond formed by the large -key ability is relatively strong.
The theory of price keys is consistent with the concept of the classic electron pair -pair -pair -pair -pair -pairing concept of chemists, and it has developed rapidly as soon as it appears. However, the calculation of the price key theory is more complicated, which makes the development slowly. As computing technology has increased, this theory will have new development.

In Ethernet technology, VB is called: Virtual Bridge
vb is actually a division of management domains, which is equivalent to a virtual L2 Lanswitch. In the application of the city network, VB is based on users. That is, each user has its own independent VB, which contains multiple VLAN tags and MAC addresses. Because each VB is isolated from each other, different VB can be assigned the same VLAN without affecting each other. The L2 chip based on VLAN divides VB cannot distinguish the same VLAN of different users.

. What is VC? What do I learn to learn VC?

It first VC is a software (IDE integrated development environment) (compilation, editing, debugging)

c and C . However, some characteristics in C are not used, such as I/O stream, polymorph inheritance

(software development tool)

VC's soul: MFC (Microsoft Basic Library)

atl (ActiveX template library)

. Other SDKs, such as OpenGL, DirectX, Drawdib (Wing)
nVC Integration, it is like Shaolin 72, and it is usually enough to learn from applied middle schools. Our current purpose is to learn a set of Shaolin long fists. This set of long boxing should include:

1, develop a rigorous software development habit, and be familiar with the basic principles of software engineering.

2, C language basis

3, c the most basic content: the concept of class, inheritance, packaging, polymorphism

4, how to use how to use it Wizard Create a program framework

5, design menu

6, design tool bar

7, design and use dialog box, familiar with the most commonly used dialog box control : Button, static text, editing box, etc.,

8, know how to build new classes, member functions, member variables, message processing functions.

9. Learn the most commonly used Windows message: such as WM_PAINT (re -painted window), mouse press, bounce, move, initialize dialog box, etc.

10, understand the simplest GDI (graphic device interface): writing text, picture frames, drawing points, drawing lines, drawing circles, brushes and brushes.

11. Familiar with the most commonly used MFC class:

cwnd

cdocument

cview
cdc r r r r r r r r r r r r r

cdialog

cwinapp

and subclass
ncstring, CPOINT, CRECT, CSIZE and other simple data types

CFILE

The content mentioned above is the content that everyone will use.

. Introduction to MFC

The above main contents are very closely related to the actual operation, and it is impossible to make it clear; more than, these in general books will speak in general books. arrive. I mainly introduce the most important MFC.

MFC is the pair of packaging, which greatly simplifies our work; learning VC is mainly to learn MFC, there are about 100 classes, but the commonly used is twenty or thirty. You should understand these commonly used classes like back 4 words; of course, do not remember to learn from, see help, look at examples, and practice practice. Moreover, all functions inside each class must be learned, and it must be accumulated over time. If you really want to be a master, be a notebook to write down the important category and functions that you think, and study at any time, it is also a good way of assault.

The most important MFC.

cwnd: Window, it is the parent class of most "visible things" (almost everything in Windows is a window, there are many small windows in the large window), such as View CVIEW, frame windows CFRAMEWND, toolbar CToolbar, dialog box CDialog, buttons CBUTTON, ETC; an exception is the menu (CMENU) is not derived from the window. This kind is very big, you don't have to learn from the beginning, just know it.

cdocume document, responsible for the interaction between memory data and disk. The most important thing is (read in), (writing), Serialize

cview view, responsible for the interaction between memory data and users. Including data display, user operation response (such as menu selection, mouse response). The most important thing is ONDRAW, usually CWND:: () is started to start it. In addition, it processs menu, toolbar, shortcut keys and other user messages through the message mapping table. Many of your own functions must be added inside, and what you deal with the most is it.

cdc device text. Whether it is a display or a printer, it is drawn for users. This picture is abstracted to CDC. Together with other GDI (graphic device interface), CDC completes the display of text, graphics, and images. Imagine the CDC as a piece of paper, and each window has a CDC connection system, responsible for drawing the window. CDC has a commonly used semi -class CClientDC (window client area), which is usually completed by CClientDC.

cdialog dialog box

cwinapp application class. The main function in C is an entrance and manager executing the program. It is responsible for the establishment, elimination of the program, and the establishment of the main window and document template. The most commonly used function (): initialization.

and subclasses for drawing drawings. They all need to choose DC before use.

cpen pen, drawing line

cbrush brush, filling

cfont fonts, controlling the font of text output
ncbitmap bit graph r r r r r

cpalette palette

CRGN area, a specified area can be used for special treatment.

cfile file. The most important thing is Open (open), read (read in), write (write)

cstring string. The character array in C is encapsulated, which is very practical.

cpoint points, that is, (x, y) pairs

c great rectangle, that is (left, top, right, bottom)
ncsize size, that is (CX CX , Cy) For (width, height)

. Use MSDN and examples

The examples are:

nhello most Simple program framework

nScripble mouse drawing. Tutorial: programming basis, GDI

NDIBLOOK image processing the simplest example

nmfcie Internet browser

nenroll database
n (data access Object) Example. Tree type and vision control

example, draw a constant rotating square

server

Draw. It also includes OLE.

nwordpad writing board. OLE

. What is the experience

a. Why use Windows instead of DOS programming

Windows programming is not much more difficult than DOS programming, but just now When I came into contact, I felt a lot of clue, and I didn't know where to start. In fact, if you know C language, you will find that Windows programming is not more difficult than when he learns C language of that year. To become a master of DOS programming, you also need to learn hundreds of functions (whether TC, BC,), and in -depth understanding of assembly language -level DOS function calls. Now under Windows, pay the same workload, but you can get several times the income. If you were familiar with DOS programming before, and now you can do Windows programming, you will definitely feel huge superiority only for two weeks: under DOS, everything must be done by yourself, and there are limits of 64K memory, display accuracy, etc. It's half the effort.

b. Why use VC instead of other Windows programming languages ​​

N most large software (including Windows itself) is compiled with C and C , so the source that can be used can be used There are a lot of code. For example, Photoshop has a VC programming interface. Other languages ​​are not as historical as VC. And VC has a lot of development tools. From control companies to hardware developers, their products rarely dare not provide VC interfaces.

nvc is suitable for organizational large engineering (VB is not available)

nborlandc or C Builder is also very good, not worse than VC. However, the BC version is not good. From 3.1 to 4.0, "generation gaps" appear, and VC provides extremely rich documents and examples. VC's reference materials are far more than BC. And VC and other members can coordinate work, which is beneficial to software engineering.

n

c. Do not learn Winapi programming at first, but it is best to learn WinAPI

, pay special attention. Do not buy book programming books. A infamous example is "". Various computer languages ​​often give an example in the entry class, showing a line of text "", whether in Basic, C, Pascal, or even compilation, this simplest applet can be written in a few lines. However, in the early Windows programming, the famous example of "HelloWin" just mentioned just now organizes a project and wrote hundreds of lines of code to achieve. This scared away a lot of people who wanted to learn Windows programming. In fact, "" shows "" under Windows, the simplest method is enough:

#Include "Windows.h"

() n () n
{

(null, "!", "", mb_ok);
n}

The simplest dialog box, but this is enough.

If you do n’t have the experience of SDK programming, learning VC is to use MFC to bypass many details of Windows programming. Why not use good tools? Now you write a "" in VC, just write a line of code.

:: ONDRAW (CDC*PDC)

{

// .... Other code
npdc- > Textout (100,100, "!");

}

but MFC is not universal. There are many functions in Winapi and VCs that cannot be reflected in MFC. After getting started, it is very important to use the full ability of VC. Moreover, these APIs are also used in other Windows languages.

The language is similar to martial arts. VC, VB, DLPHI, VFP, and other Windows programming languages ​​belong to the same martial arts: Windows door. Although the moves are different, the internal skills are the same. This is (application programming interface), about two thousand functions. Any martial arts, even if it is complicated, can usually be written down in a short time; but internal power is not a matter of overnight. Moreover, the internal skills of each school are different. The UNIX and Linux doors have UINX's internal skills. The Apple (Apple) Gate has Mac's internal skills, and Java is self -contained. The learning VC we are talking about here is just a way to learn. It is almost enough for a month. It can be mastered for two weeks. Optical moves are enough to scare people, but when they have a trick with a master, they must be ugly. If you want to be proficient in VC, you must be familiar.

d. Advanced language and natural language

The high -level language is similar to a natural language. There are three key elements:

grammar: It is easier to understand the basic syntax of C and C .

Rhetoric: art and style of programming. Usually, this is associated with software engineering. The trick on the algorithm is not the key. Rigidity, strictly in accordance with the norms, and at the same time, it can play great creativity, which is the true nature of linguists.

Vocabulary: How to use the work of others? How to use your previous work? This is the key to the success of a software engineer. If the vocabulary is not abundant, you can't write a good article, and you will be unable to express it. A person's grammar has basically learned before elementary school, and the level of rhetoric was determined when he was young. Only the vocabulary needs to be continuously learned and expanded as needed. In VC programming, having a large vocabulary means that you need to master more classes, functions, and other programming components. Such as:, MFC, and the ready -made SDKs of the fields you specialize in, such as OpenGL in 3D programming, DirectX in multimedia programming, and VICTOR libraries in image processing. In addition, the mastery of ActiveX controls is often the key to success or failure. Our work in recent years has also been summarized into a class library called IPX (image processing framework), which greatly simplifies the work of image processing; however, there are still many details to be solved. Work.

This learning VC, do not use the method of learning English in school, but use children to learn to speak. The so -called method of learning English is the mode of learning the C language in undergraduate undergraduate: to understand every detail in detail, carry a lot of rules, rarely practice on the machine, there is no actual problem to solve it, and finally the test will determine the learning results of the learning results. Essence The consequences of this model are clear: We have studied English for more than ten years, but many people will only have four or five thousand words. Write a hundred words of articles. Can't understand the help document of VC. We have to use the grammar, rhetoric and vocabulary in the middle school like a baby; at the beginning, we must only compile the worst ones, as if the child starts to say: "Dad take a car"; but "dad" and "car" these Words are the most needed for children, but the efficiency of learning is the highest. When learning VC, you should start from my needs, first do the simplest thing, and then complicate little by little, like snowballs.

The learning VC is particularly communicated with others. If you think hard, you may not understand, maybe others have solved it long ago. Be good at learning: find useful books from the bookstore; learn from the masters around you; find the source code, class library, components, controls, and libraries that can be available; if you can connect to the network, you can solve the problem.

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lchrennew:

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VC is the abbreviation of English, and its complete forms basically include the following aspects:

1. Medicine, pharmaceutical, biochemistry: Vitamins C, abbreviated VC, transliterate "vitamin C", translated Chinese as vitamin C, and is also called ascorbic acid.

[Excerpted from ./question/5925454 R R N1907 Norwegian chemist Holmest found in lemon juice. It was only obtained in 1934. It is a colorless crystal. It belongs to water -soluble vitamins and is easily soluble in water. Stable in acidic solutions, which are easily oxidized and decomposed in neutral or alkaline solutions. Metal ions such as iron and copper can accelerate its oxidation rate.

The main function of vitamin C in the human body is: participating in the oxidation and reduction process in the body, promoting the growth and development of the human body, enhancing the human body's resistance to disease, promoting the formation of collagen in the cells, maintaining the teeth , Boys, blood vessels and muscles are normal, enhance the ability of the liver to detoxify. When vitamin C is lacking in the human body, gum bleeding, loose teeth, fragile bones, mucous membranes and subcutaneous bleeding, and wounds are not easy to heal. In recent years, scientists have also discovered that vitamin C can prevent nitrite from combining nitrite and bell amine into a carcinogenic substance -sidamine, thereby reducing the incidence of cancer.

2. Software, computer science, Windows Development: Visual C and Visual C , an important one in Visual Studio developed by Microsoft, developed by Microsoft. Standards, and it integrates the basic library (MFC, Microsoft Classes) and visual development environment for Microsoft's development. VC provides a large number of APIs for Microsoft Windows operating systems, which greatly improves development efficiency than other languages. However, the program written in MFC can only run under the Windows operating system.

3. Economic and financial fields, companies operation: Venture, venture capital, venture capital is also called "entrepreneurial investment", generally refers to investment in high -tech industries. As an investment area outside the mature market, the investment risk is great, its capital comes from financial capital, personal capital, corporate capital, and pension insurance funds and medical insurance funds. From the perspective of the practice of various countries, most of the venture capital operates in investment funds.

The risk investment is different from general investment, manifested in:

1) High risk. The target of venture capital is small and medium -sized high -tech enterprises that have just started or have not yet started. The size of the enterprise is small and does not have fixed assets or funds as mortgage or guarantee. Because investment targets are often "seed" technology or a conceptual creativity, and they are in the starting design stage, there are many uncertain factors whether they can be transformed into real productivity. Therefore, high risk is the essential characteristics of venture capital.

2) High returns. Risk investment is a forward -looking investment strategy. It is expected that the high growth and high value -added of the enterprise are the inherent causes of their investment. Once the investment is successful, it will bring ten or even 100 times investment returns. High -risk and high returns are fully reflected in the process of venture capital.

3) Low liquidity. Risk capital was invested in the early days of the establishment of high -tech enterprises. When the enterprise developed mature, it could monetize equity through the capital market and obtain returns, and then conduct a new round of investment operation. Therefore, the investment period is long, usually 4 to 8 years. In addition, when the risk capital finally exits, if the export is not smooth, the withdrawal of capital will be very difficult, resulting in a decrease in the liquidity of risk investment.

Essentially speaking, venture capital is a supporting system for high -tech industries to invest in capital and perform effective use. The vigorous development of the knowledge economy is its main role. Of course, for the entire country's economy, venture capital is of great significance to promote corporate technological innovation, promote the adjustment of industrial institutions, change social employment structure, expand the choice of personal investment, and strengthen the depth of the capital market.

VC's abbreviation of VISION in Germany is famous in the industry.

The German VISION is a recognized leading manufacturer of smart camera in the world. Its camera products integrate image collection, processing, IO control and communication. And the most powerful image processing DSP is adopted, the degree of intelligence is high, and the cost of building system is low. It is an ideal choice for users to construct a machine visual system.
VC smart camera features:
. Computing speed of PC
. Connect to other devices on the production line
3. Video images that can output SVGA or SXGA directly on the display
4. Provide highly open image processing libraries and some commonly used libraries
5. The secondary development of the source code level
6. The work process can be completely separated from the PC

VC is the abbreviation of the famous NBA player Vince Carter

Simply put:
vb evolved from the BASIC language, which means visualization of basic, while VC is Visualc evolved from C language, which means visualization C . It is recommended to learn VB first. If you need to learn programming in the future, you can attack VC. At that time, you will find how easy the VC is VC after mastering the programming foundation.

They are all object -oriented languages, do software, generally C/S mode software
vb relatively simple