velfm.htm

简单的说明如何使用VB,非常适合初学使用者,而且是用图表来解说的

<BR>

<P>Visual Basic supports all kinds of data. This lesson teaches you 
about Visual Basic variables, data, and controls. You must understand the various data types possible in Visual Basic before you can work with data. You'll see how Visual Basic supports 
both numeric and character data as well as learn the mathematical 
operators that Visual Basic recognizes.

<BR>

<BR>

<A NAME="E69E5"></A>

<H4 ALIGN=CENTER>

<CENTER>

<FONT SIZE=4 COLOR="#FF0000"><B>Lesson 5: Gaining Control</B></FONT></CENTER></H4>

<BR>

<P>The messages that you place in programs that help you 
update those programs later are called <I>remarks</I>. It's vital that you learn the importance of proper program documentation early. Of course, interacting with users is extremely important also, 
and message boxes are Visual Basic's primary means for 
asking the users questions and getting answers. In addition to the remark and message box processing, this lesson explains the looping elements of the language. By repeating sections of a program, the 
program can perform multiple calculations on a large 
series of data values.

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<BR>

<A NAME="E69E6"></A>

<H4 ALIGN=CENTER>

<CENTER>

<FONT SIZE=4 COLOR="#FF0000"><B>Lesson 6: Combining Code and Controls</B></FONT></CENTER></H4>

<BR>

<P>Now that you've mastered most of Visual Basic's user interaction 
controls, this lesson takes you the next step of the way by demonstrating how to create lists of data and controls that greatly improve the power of the programs that you write. Once you 
introduce lists into a program, the check boxes and option buttons 
give your users the means by which they can interact with those lists of data.

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<BR>

<A NAME="E69E7"></A>

<H4 ALIGN=CENTER>

<CENTER>

<FONT SIZE=4 COLOR="#FF0000"><B>Lesson 7: Functions and Dates</B></FONT></CENTER></H4>

<BR>

<P>Visual Basic 
supplies a large number of math, character, date, and time functions. These functions eliminate tedious coding on your part that you would normally have to do. By providing pre-written function routines, Visual Basic lets you concentrate on 
the 
user-specific portions of the applications that you write.

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<BR>

<A NAME="E69E8"></A>

<H4 ALIGN=CENTER>

<CENTER>

<FONT SIZE=4 COLOR="#FF0000"><B>Lesson 8: Modular Programming</B></FONT></CENTER></H4>

<BR>

<P>Once you've mastered Visual Basic's 
built-in function routines, it's time to learn how to write your own functions that you can add to your own growing library of Visual Basic routines. As you write more and more Visual Basic programs, you will write 
routines that you can use in more than 
one program. Thus, as you build your Visual Basic library of programs, you'll be able to reuse parts of programs that you've already written and speed all subsequent program development.

<BR>

<BR>

<A NAME="E69E9"></A>

<H4 ALIGN=CENTER>

<CENTER>

<FONT 
SIZE=4 COLOR="#FF0000"><B>Lesson 9: Extending Data and Programs</B></FONT></CENTER></H4>

<BR>

<P>Your computer would be too limiting if you couldn't store data to the disk and load that data back into your programs. Disk files are required by most 
real-world applications. The units in this lesson describe how Visual Basic processes disk files and 
teaches you the fundamental principles needed to effectively work with disk files.

<BR>

<BR>

<A NAME="E69E10"></A>

<H4 ALIGN=CENTER>

<CENTER>

<FONT 
SIZE=4 COLOR="#FF0000"><B>Lesson 10: Making Programs &quot;Real World&quot;</B></FONT></CENTER></H4>

<BR>

<P>By adding menus to your programs, you give additional control to the users of your applications. Most Windows programs support the use of menus 
and the programs that you write with Visual Basic support the standard Windows menu system. In addition to 
adding menus, this lesson also teaches you how to track timer controls so that you can write real-time programs that respond to the passing of time.


<BR>

<BR>

<A NAME="E69E11"></A>

<H4 ALIGN=CENTER>

<CENTER>

<FONT SIZE=4 COLOR="#FF0000"><B>Lesson 11: Spruce Up your Programs</B></FONT></CENTER></H4>

<BR>

<P>Visual Basic supports the use of printed reports that you can create with the commands 
that you learn in this lesson. Not only will the addition of the printer add to your program power, but you can also add spice to your programs by drawing graphics on 
the program screens that you create to offer eye-catching pictures that capture the 
user's attention.

<BR>

<BR>

<A NAME="E69E12"></A>

<H4 ALIGN=CENTER>

<CENTER>

<FONT SIZE=4 COLOR="#FF0000"><B>Lesson 12: Getting Exotic</B></FONT></CENTER></H4>

<BR>

<P>This lesson extends your fundamental knowledge of the Visual Basic programming 
system by teaching you how to work with additional user controls called scroll bars and grid controls. Scroll bars give users visually-moving controls over data values and 
input. Using the grid, users can see tables of data that you present in a 
spreadsheet-like format. You'll also learn ways to respond to mouse movements and clicks. By this lesson's end, you will have mastered most of Visual Basic's fundamental programming 
techniques. Due to the complex nature of programs that you will begin to 
write by this lesson, the book ends with a discussion of Visual Basic's interactive debug sessions that shows you how to eliminate problems that might creep into the programs that you 
write.

<BR>

<BR>

<A NAME="E68E5"></A>

<H3 ALIGN=CENTER>

<CENTER>


<FONT SIZE=5 COLOR="#FF0000"><B>This Book's Disks</B></FONT></CENTER></H3>

<BR>

<P>This book contains the Visual Basic programming system called the <I>Visual </I><I>Basic Primer</I>. Visual Basic is made by Microsoft, a world-famous company known for 
its Windows operating environment. The Visual Basic programming system comes with an 
integrated editor, debugger, and program designer with which you can write fully-working Windows programs.

<BR>

<BLOCKQUOTE>

<BLOCKQUOTE>

<HR ALIGN=CENTER>

<BR>


<NOTE><B>Note: </B>The second unit of Lesson 1 explains how to install the Visual Basic programming system on your computer.</NOTE>

<BR>

<HR ALIGN=CENTER>

</BLOCKQUOTE></BLOCKQUOTE>

<P>The disks also contains all the code in all of this book's 
programs. In addition, the disks contains answers to all review questions and exercises at the end of each unit, except for the extra credit problems. The answers are organized by lesson and are 
in a directory named \ANSWERS.

<BR>

<BR>

<A 
NAME="E68E6"></A>

<H3 ALIGN=CENTER>

<CENTER>

<FONT SIZE=5 COLOR="#FF0000"><B>Conventions Used in this Book</B></FONT></CENTER></H3>

<BR>

<P>This book uses the following typographic conventions:

<BR>

<UL>

<LI>Code lines, variables, and any text that 
you see on-screen appear in monospace.

<BR>

<BR>

<LI>Placeholders in statement syntax explanations appear in <I>italic </I><I>monospace</I>.

<BR>

<BR>

<LI>New terms appear in <I>italic</I>.

<BR>

<BR>

<LI>Filenames in regular text appear in 
uppercase, such as MYFILE.DAT.

<BR>

<BR>

<LI>Optional parameters in statement syntax explanations are enclosed in flat brackets ([]). You don't type the brackets when you include these parameters.

<BR>

<BR>

<LI>Menu commands appear like this: File 
Open. This command means to select the Open option from the File menu.

<BR>

<BR>

</UL>

<P>The following items also appear throughout this book:

<BR>

<BLOCKQUOTE>

<BLOCKQUOTE>

<HR ALIGN=CENTER>

<BR>

<NOTE><I>Definition: </I>Definitions of new 
terms often appear in the paragraph in which the term first appears.</NOTE>

<BR>

<HR ALIGN=CENTER>

</BLOCKQUOTE></BLOCKQUOTE>

<BLOCKQUOTE>

<BLOCKQUOTE>

<HR ALIGN=CENTER>

<BR>

<NOTE><B>Note: </B>When further thought is needed on a particular topic, 
the note icon brings extra information to your attention.</NOTE>

<BR>

<HR ALIGN=CENTER>

</BLOCKQUOTE></BLOCKQUOTE>

<P><B>Tip: </B>A tip shows you an extra shortcut or advantage possible with the command you just learned.

<P><B>Warning: </B>Sometimes 
you must take extra care when trying a particular command or function. Warnings point out dangers before you encounter the dangers yourself.

<BLOCKQUOTE>

<BLOCKQUOTE>

<HR ALIGN=CENTER>

<BR>

<NOTE>Sidebar: In addition, you'll find several sidebars with 
useful information that is related to the topic at hand.</NOTE>

<BR>

<HR ALIGN=CENTER>

</BLOCKQUOTE></BLOCKQUOTE>

<P><FONT COLOR="#FF8000"><B><I>Concept: </I></B></FONT>Concepts, located at the beginning of each major section, provide a succinct 
overview of the material in that section.

<BR>

<P><FONT COLOR="#FF8000"><B><I>Review: </I></B></FONT>Reviews, which appear at the end of each major section, recap the material you learned in that section.

<BR>

<P><FONT COLOR="#FF8000"><B><I>Stop and 
Type: </I></B></FONT>This icon provides a description of a subsequent program listing.

<BR>

<P><FONT COLOR="#FF8000"><B><I>Input:</I></B></FONT> An input icon marks a program listing that demonstrates the major concepts from the section you just 
finished.

<BR>

<P><FONT COLOR="#FF8000"><B><I>Output: </I></B></FONT>This icon accompanies a typical output of the program or program screen.

<BR>

<P><FONT COLOR="#FF8000"><B><I>Analysis: </I></B></FONT>A detailed description of the program appears 
after the output.

<P ALIGN=LEFT>

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