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I used the stdafx.h header file pre-compiled from Baidu is how ignorance

admin — Wed, 28 Mar 2012 23:58:37 +0000

This technique is very delicate, do not you think so? (One would also like to say, Microsoft is not the first to adopt the technology company, is the Borland.) In this process, you must observe the following rules:
the ◎ when Visual C when compiled stdafx.cpp file, it will save the results In the file a stdafx.pch. (Extension pch precompiled header file.)
◎ AppWizard to establish stdafx.cpp. This file usually is the same.
◎ If you have the majority of the project file. cpp files need. h file, by the way they added to the stdafx.h (rear), and then precompiled stdafx.cpp.
◎ When the Visual C compiler for each subsequent. cpp files, it is read and use it just generated. pch file. VShoppingisualC no longer analysis Windowsinclude file, unless you had edited stdafx.cpp or the stdafx.h.
We generally use the TC or vc compiled C program must first include the stdio.h header file, this header file which contains the definition of the scanf and printf function, if we are not the beginning of the program include this file, then you call the above two functions would not be successful, it is actually C in much the iostream.h file, they generally have to be included in the stdafx.h file.
Extensions
◎ AppWizard file the stdafx.h This file contains all of the current project file needs MFCinclude file. And this document can change with the selected option.
popular
and the stdio.h difference
stdafx.h library, just define a number of environmental parameters, making the compiled program can 32-bit operating system environment running under.
is equivalent to the stdafx.h includes others such as iostream.h and other documents
“stdafx.h” before the code is precompiled, it skips the # include “stdafx
compiled through a header file stdafx.h precompiled header files. the stdafx.h this header file names can be specified in the project compiler settings. compiler, all precompiled header directive # include
The files generated by the compiler stdafx.cpp, named after the project name, the precompiled header file suffix is ??”pch”, so compilation results file is projectname.pch to the
h instructions, use projectname.pch compile this all the code after the instruction. the the
detailed working principle and the role of
Therefore, all of the MFC to achieve the first statement of the file are: # include “stdafx.h”.
When we use the AppWizard to automatically generate some of the items, the system will automatically include the required header files in stdafx.h first include what, so we only need to directly include the stdafx.h file can be because the CPP of the same project in different source files contain the same include file, so that, for each CPP file is repeated to include these files seem silly. Of course, if you do not use MFC, then no. : In each cpp files in the include
so-called header files pre-compiled, pre-compiled is used in a project (the Project) MFC standard header files (such as Windows.H, Afxwin.H), after compile time, the project is no longer compile this part of the header files, just use the precompiled results. This can speed up the compilation speed, to save time. the whole called the the

name English: the Standard Application Framework
Windows and MFC include files are very large, even if there is a quick handler, the compiler should take a very long time to complete the work . Each CPP file contains the same include file, repeat the processing of these documents for each CPP file, it is stupid.
To avoid this waste, the AppWizard to Visual C compiler to work, as follows:
If you have limited disk space, you would like to add the project file that you e never used pch file is deleted. The implementation of the program do not need them, and with the re-establishment of the project file, they are also automatically re-established.
◎. pch file has a lot of symbolic information, it is the largest file in your project file.
◎ you write. cpp files must include the stdafx.h.
how to understand the principle
◎ then AppWizard to establish a project file, so first be compiled file is stdafx.cpp the

The role of the StdAfx.h header file

admin — Wed, 28 Mar 2012 23:58:32 +0000

/ / To avoid interaction between the header files contain
◎ Visual C compiler for each subsequent. Cpp files, read and use it just generated. Pch file. Visual C no longer sub-Windowsinclude file, unless you editing the stdafx.cpp of or the stdafx.h.
a PCH Trhough File is the std
1.afxwin.h the MFC programming required file, which contains the header files necessary to run such as a CString, the CEdit class, it is best to ensure that the sentence in the first line of the header files ; It will also call windows.h, change the header file contains the data type definition, the definition of the API entry point, and other useful parameters;
3. # define
WIN32_LEANAND_MEAN in the windows header files rejection of the MFC class library, in order to speed up the compile time;

To avoid this waste, AppWizard to Visual C compiler to work, as follows:
Frame, later named to the team afx, no meaning, but constitute a resounding slogan, and later on has been in use down. The
◎ AppWizard then establish stdafx.cpp. This file usually is the same.
◎ you write. cpp files must include the stdafx.h. The ◎
then AppWizard is to establish the project file, so that file is first compiled stdafx.cpp.
_MSC_VER> 1000

# endif / /
: WINDOWS.H already

6. The establishment of a new empty project, project stdafx.cpp use the Create Precompiled afx the af refers to the abbreviation of the Application Frame, there was a technical development team specifically for the Application
Header (/ Yc), and other. cpp used for Use Precompiled Header (/ Yu), and the Create / Use
2. non-MFC project using the MFC library, the most common problem is that windows.h repeat contains an error: fatal error C1189: # error
◎ AppWizard to file the stdafx.h, the file contains All current project files need to MFCinclude file. And this document can change with the selected option.
# pragma once
◎ If you need most. cpp files in the project file. h file, the way will add them in the stdafx.h (rear), then pre-compiled stdafx.cpp.
only defines a number of environmental parameters, making the compiled program can be run in 32-bit operating system environment. Windows and MFC include files are very large, even if there is a quick handler, the compiler must take a very long time to complete the work. Each CPP file contains the same include file, repeat the processing of these documents for each CPP file, it is stupid.
5. # if

Note:
included MFC apps must not

the stdafx.h full name: Standard Application Fram, Extend,
_MSC_VER> 1000

stdafx.h file of the role

admin — Wed, 28 Mar 2012 23:58:13 +0000

When we use the AppWizard to automatically generate some of the items, the system will automatically include the required header files in stdafx.h first include, so we only need to directly include the stdafx.h file to the same CPP project in different source files are to contain the same include file, so that each CPP file repeated to include these files, it is silly. Of course, if you do not use MFC, then no. Namely: in each cpp files in the include to the
compile the set position:
reduce the precompiled header file.
popular
this technology is very sophisticated, do not you think so? (One would also like to say, Microsoft is not the first to adopt the technology company, is the Borland.) In this process, you must observe the following rules:
◎ AppWizard to file the stdafx.h file contains all the current project file needs MFCinclude file. And this document can change with the selected option.
the stdafx.h equivalent contains other such as iostream.h file

how to understand the principle
own understanding:
This is the main role, mainly used in an MFC program.
precompiled header files generated by compiler stdafx.cpp, named after the project name, the precompiled header file suffix is ??”pch” and compiled results file is projectname.pch to.
◎ Visual C Compiler for each subsequent. cpp files, and it read and use it just generated. pch file. Visual C is no longer analysis Windowsinclude file, unless you edit the stdafx.cpp or the stdafx.h.
To avoid this waste, the AppWizard to Visual C compiler to work, as follows:
Baidu Baike Definition:
the ◎ when Visual C compiled stdafx.cpp file, it will save the results in a stdafx.pch the file. (Extension pch precompiled header file.)
So-called header files pre-compiled, pre-compiled is a project (the Project) Shopping MFC standard header files (such as Windows.H, Afxwin.H) after the project is compiled, no longer compile this part of the header file, just use the precompiled results. This can speed up the compilation speed, to save time.
◎ you write. cpp files must include the stdafx.h.

and the the stdio.h difference between
“stdafx.h” before the code is precompiled, it skips the # include “stdafx.
Application Framework Extensions
If the stdafx.h, stdafx.cpp
compile the header file stdafx.h to use precompiled header file. the stdafx.h this header file name is specified in the project compiler settings. The compiler directive # include
◎ then AppWizard to establish a project file, so that the file is first compiled stdafx.cpp
◎ the if you have the majority of the project file. cpp The files need to be. h files, by the way they are added to the stdafx.h (rear), then precompiled stdafx.cpp.
profile name full name in English: Standard
all the MFC implementation file The first statement is: # include “stdafx.h”.
the stdafx.h in the library, only defines a number of environmental parameters, making the compiled program can be run in 32-bit operating system environment. We generally use the TC or vc compiled C program should first include the stdio.h header file, which contains the scanf and printf functions defined in this header file, if we are not the beginning of the program include this file, then you call the above two functions will not be successful, it is actually C in much the iostream.h file, they generally have to be included in the stdafx.h file
h directive projectname.pch the Compile all the code after this instruction.
If your disk space is limited, you would like to add that you e never used in the project file. pch file to delete. The implementation of the program do not need them, and with the re-establishment of the project file, they are also automatically re-established. The

works. and effect
◎. pch file has a lot of symbolic information, it is the largest file in your project file.
project-> setting-> c / c -> category-> …..
◎ AppWizard and then on the establishment of stdafx.cpp. This file usually is the same.
Windows and MFC include files are very large, even if there is a quick handler, the compiler must take a very long time to complete the work. Each CPP file contains the same include file, repeat the processing of these documents for each CPP file, it is stupid.
file has not changed, you only need to compile again, the future is to use the results of previously compiled.

[24] C header files in stdafx.h and (r)

admin — Wed, 28 Mar 2012 23:58:08 +0000

If you need most. Cpp files in the project file. H files, by the way they added to the stdafx.h (rear), and then precompiled stdafx.cpp.

4.afx – afx the af refer to the File of Application
are std
Frame, later named to the team using afx, x does not have meaning , but constitute a resounding slogan, and later had been standing.

# endif / / _MSC_VER> 1000
Windows and MFC include files are very large, even if there is a the Shopping rapid processing program, the compiler also takes quite a long time to complete the work. Each CPP file contains the same include file, repeat the processing of these documents for each CPP file, it is stupid.
file. And this document can change with the selected option.
header, need to set the compiler option), the next compile time to reduce the total compilation time. If you use ClassWizard to define a new class, it is possible new

3 in stdafx.h # define
the
Visual C is no longer analysis Windowsinclude file, unless you editing the stdafx.cpp of or the stdafx.h.

# pragma once / / avoid header files contain each the
when Visual C compiled stdafx.cpp file, it will save the results in a file named stdafx.pch. (Extension pch precompiled header file.)
# Include; the
1.afxwin.h the necessary documents for MFC programming, which contains the header files necessary to run such as the CString, the CEdit class, the best ensure that the sentence in the first line of the header files; it also calls windows.h, change the header file contains the definition of data types, API entry point definitions and other useful parameters;
the other. cpp used for Use precompiled Header (/ Yu), and the Create / Use PCH Trhough

Standard Application Fram Extend

5.
1.AppWizard file the stdafx.h file contains all the current project file needs to MFCinclude

library, just define a number of environmental parameters, making the compiled procedures in 32 operating system environment running under.
error C1189: # error: WINDOWS.H already included. MFC apps must not

the # if _MSC_VER> 1000 / / version

The 5 when Visual C Compiler for each subsequent cpp files, read and use it just generated. pch file.

. pch file has a lot of symbolic information, it is the largest file in your project file.

If you have limited disk space, you would like to add the project file that you e never used . pch file to delete. Enforcement procedures do not need them, and with the re-establishment of the project file, they are also automatically re-establish
6. The establishment of a new empty project, project stdafx.cpp use the Create Precompiled the Header (/ Yc)
.

the
Note: and
WIN32_LEANAND_MEAN, refused to accept the MFC class library, in the windows header files to speed up the compile time; Frame abbreviation, there was a technical development team specifically for the Application

The 2 non-MFC project using the MFC library, the most common problem is that windows.h repeat contains an error: fatal
stdafx.h file contains the necessary header files (such as afxwin.h), corresponding to a stdafx.cpp files in stdafx.h, the document contains a:

(but also to say that Microsoft is not the first to adopt the technology company, Borland is.) In this process, you must observe the following rules:

2.AppWizard then to establish stdafx.cpp. This file usually is the same.
# include “stdafx.h”, whose role is to make the compiler to compile a stdafx.obj precompiled header file (pre-compile
include files. For example, if the selection of the MFC the template of the classes, the stdafx.h will increase in: # include

1 you write. cpp file must first contain the stdafx.h.
3. then AppWizard to establish a project file, such a compiled file is stdafx.cpp the
the
To avoid this waste, AppWizard and the Visual C compiler to work together, as follows:

VC , why in each CPP file must be added StdAfx.h header file

admin — Wed, 28 Mar 2012 23:58:03 +0000

Finally, the use of pre-compiled header files will need to use the project frequently, but the changes do not frequent the header file into StdAfx.h, so only need to first compile time generate projectname.pch file after StdAfx.h file The content does not change, StdAfx.cpp, will not need to be recompiled, in order to once again improve the compilation speed.
Second, which requires each CPP if you want to use precompiled header file projectname.pch speed up the compilation speed, the VC default by the StdAfx.h the method by adding file in to inform the compiler needs to use the projectname . pch, of course, if you do not use precompiled header files do not want to have such restrictions, then, can be in the project -> settings -> c / c -> precompiled header file, modify the related options that do not use pre-compiled header file.
First of all, there is a corresponding StdAfx.h StdAfx.cpp file, their purpose is first compiled to generate a projectname.pch a precompiled header file for all the cpp files in the project In this case, a cpp file in the project need to reference the header files, then you only need to refer to the precompiled pch file without the need of the introduction of the header files, in order to avoid the trouble of re-compiled header files, the head of the MFC system files are relatively huge, if each CPP renumbered Shopping translated again header files will waste too much compile time, so this approach can greatly speed up the compilation speed.

XmlElement and XmlNode accurate interpretation of the difference between

admin — Wed, 28 Mar 2012 16:58:36 +0000

which is more accurate, Why do I say, we now look to their inheritance hierarchy:
a.GetAttribute (“b”);
string

,
XmlElement is XmlNode, not interchangeable.

XmlNode a;


2010-01-26 04:22 PM
XmlNode error may occur because the XmlNode that contains more than XmlElement XmlElement change.

the XmlNode change XmlElement is possible, but if the

=

we can find, XmlElement inherits from the XmlNode, the inheritance point of view:

XmlElement

commonly used in the code:
C # XmlElement and XmlNode accurate interpretation of the difference between
d = “1″> 1

on this both the difference between the online version, said are very detached, and some are very professional, but the theory is not enough essence. Most of them are:
Therefore, the derived class with more derived class members.

Note : derived class access to the members of the base class
s

=
string
derived class can access public members of the base class, protected members, internal members and protected internal members. Even if the derived class inherits the private member of the base class, and still not have access to these members. However, all these private members in a derived class still exists, and perform the same work in the base class itself. For example, suppose a protected base class method to access the private field. Make the inherited base class method to work properly, the derived class must have the field.

a.Attributes ["b"]. Value;

a;

XmlNode and XmlElement difference

admin — Wed, 28 Mar 2012 16:58:22 +0000

Code0
XmlDocument xmleDoc = new XmlDocument ();
codeNode = xmlnDoc.CreateNode (XmlNodeType.Element, “Code”,
i.ToString ();
generated as follows:
String.Empty is);
the Code2 the the
itemNode.AppendChild (codeNode);
Name = “Name0> Code0
Name1
Name2
/ / XmlElement generate XML
< / Customer>
XmlNode xmlnRoot = xmlnDoc.CreateNode (XmlNodeTShoppingype.Element, “nRoot”,
/ / XmlNode generate an XML
Name = “Name1″> Code1

for (int i = 0; i <3; i )
}
XmlElement
xmlnRoot.AppendChild (itemNode);
XmlNode
XmlNode
= xmlnDoc.CreateNode (XmlNodeType.Element, "Customer",
String.Empty);
String.Empty);
XmlDocument xmlnDoc = new XmlDocument (); Name = “Name2″> Code2
}
{
xmlEle.SetAttribute (“Code”, “Code” i.ToString ());

“Name” i.ToString ());
XmlElement xmleRoot = xmleDoc.CreateElement (“eRoot”);

XmlNode itemNode = null;
for (int i = 0; i <3; i )
= "Code" i.ToString ();
Code1
itemNode
nameNode = xmlnDoc.CreateNode (XmlNodeType.Element, "Name",

xmlEle.SetAttribute ("Name", xmlEle xmleDoc.CreateElement (the “Customer”);
xmlnDoc.AppendChild (. xmlnRoot);
String.Empty is);
generate results as follows:
xmlEle.InnerText = “Code”

= “Name” i.ToString ();
Name0
itemNode.AppendChild (nameNode);

{
nameNode.InnerText codeNode.InnerText
xmleRoot.AppendChild (xmlEle);

xmleDoc.AppendChild (xmleRoot);

In Delphi MediaPlayer

admin — Sat, 04 Feb 2012 12:50:12 +0000

Play;
begin
end;
the With MediaPlayer1 do
FileName: = … wav / / here less because it is the correct path
Wave or AVi file in Delphi use MediaPlayer to play, pointed out that relative to Shopping off device type but does not play, do not specify a given type of device that can play, please help me how kind of going under, thank you!
procedure TForm1.ButtonClick (Sender: TObject);
begin
DeviceType: = the tWaveAudio if added in the above code
“DeviceType: = the tWaveAudio ” can play, plus they can not play
end;
Open;

The difference between XmlNode and XmlElement summary

admin — Sat, 04 Feb 2012 12:49:44 +0000

2, XmlElement XmlNode class, the Xml node has a variety of types: attribute nodes, comment nodes, text nodes, element nodes. Is XmlNode multiple nodes collectively referred to Shopping. But the XmlElement specifically refers to the element node.
C #
4 to XmlElement have many methods of operation on the Attribute easy its properties to read and write operations (XmlNode can also be obtained through the Attributes property of the list of attributes).
element node corresponding conversion XmlElement, so that both can use the XmlNode function of its unique method of operation of the attributes can also be used.
1, through inheritance relationship XmlElement inherits from XmlLinkedNode inherited from XmlNode class, can be seen XmlElement is XmlNode subclass. We know that the subclass inherits all the properties and methods of the parent class methods and properties owned by the XmlNode, XmlElement class is used.
online to see someone so comment on the difference between these two classes: the XmlNode that contains the child node, XmlElement that contains only attributes in and of itself does not contain child nodes. I passed the code test and found that even XmlElement, but also can the ChildNodes to obtain the list of child nodes. Although the breakpoint mode, I did not find XmlElement ChildNodes property. The following are examples:
/ / just The XmlNode
use xml recorded background music information of a website, to understand a bit. Net operating an XML document. See a little good:
/ / both XmlNode is XmlElement
/ / XmlNode is also XmlElement but only img and aspnet.jpg The XmlNode
3 XmlElement with the current class can be instantiated directly , and XmlNode is an abstract class, must pass the XmlDocument instance through CreateNode created.

Web design, There are several audio link on the page, and then call mediaPlayer play! Is the point which will play the Which? js code how

admin — Sat, 04 Feb 2012 12:49:34 +0000

mediaPlayer is and then a link to the address reached this VALUE = “audio file address