c Query which directory exists in the message

Dots, indicating that the later part is a member of the earlier part, which is a structure, or a class.

Relationship between message and data: Data is a subordinate member of message.

Parentheses indicate that data() is a parameterless function, i.e., data is a subordinate member function of message without parameters.

1. Style node, not to mention this, is the same as the style node in the HTML page, which is used to define the style in the TPL of the template below.

2. TPLS node, here is the default template of the log type, the content of the template is understood by everyone, that is, html tags, which have three placeholders、、, log type and refers to a class of things, which are fatal, error, warn, info, debug five types, this is the reference log4net, where it is called the log level.

You don't use it correctly, messagebox() has four parameters, the first is the window handle, the message content, the message title, and the button type.

You can first understand the message mechanism of Windows, because every operation you do with the program is to send a message, such as a mouse click, which sends a mouse click message, and then processes the click message (you can control how to deal with this message, such as opening xx, or whatever, different messages with different controls can have different effects).

Do you mean MFC? This stuff can be checked on the Internet, go to csdn, it's very comprehensive.

There are a lot of these books, and my bookstore here is full of two columns, but they are quite expensive, and you can look them up on the Internet, and they are everywhere.

1. Determine whether the folder exists

1.Use createdirectory(".//filemanege",null);If the folder filemanege does not exist, it is created.

2.or if( access(".//filemanege", 0)==-1), indicating that filemanege does not exist.

3.or bool pathisdirectory(lpctstr pszpath); 2. Determine whether the document exists

1.Use if((file=fopen(".//filemanege//f","rb"))==null)

file=fopen(".//filemanege//f","ab+");Determine whether there is a file first, and create a new one if not.

2.Use if( access(".//filemanege//f", 0)==-1), indicating that the file does not exist.

function int access( const char *path, int mode ); You can determine the mode attribute of a file or folder.

mode=00;//existence only

mode=02;//write permission

mode=04;//read permission

Header files need to be included.

and resource files in one directory should.

There should be an include folder in the directory where Microsoft Visual Studio 2008 is installed.

After VS2005, the default is Unicode, and in VC++ it is the ANSI character set by default, so this problem will occur in VS for programs that pass under VC. There are two ways to solve this:

1。Convert with text();

That is, if Unicode is defined, the identifying character is Unicode; Otherwise, the ANSI character set.

syntax:

text(lptstr string

2。Project Menu - Project Properties (Last) - Configuration Properties - General - Project Defaults - Character Set, change the use of Unicode character set to not set.

Cast your second argument with cstring (argument 2).

When your function messageboxw() is called, the second parameter type in it is inconsistent and the error has long been wrong, you need to do a type conversion to convert the const char type to lpcwstr type, or you can force the conversion when passing in, that is, add (lpcwstr) in front of the second parameter in messageboxw().

If it's MFC, take everything in the program"abcd"The string of the form is changed to t("abcd")

If not, include the header file first, and then change it.

You can look up msdn to see what lpcwstr meansIn addition, the average person should call the messagebox function, and the error ** shows that it is indeed messageboxw, don't you think it's strange, and also take a look at msdn.