Diverse sprintf Functions

Function types:

There are many string output functions, as shown in the following table:

 

 

	ASCII	Wide text	General
Number of parameters
Standard Edition	Sprintf	Swprintf	_ Stprintf
Max length Edition	_ Snprintf	_ Snwprintf	_ Sntprintf
Windows	WsprintfA	WsprintfW	Wsprintf
Parameter array metrics
Standard Edition	Vsprintf	Vswprintf	_ Vstprintf
Max length Edition	_ Vsnprintf	_ Vsnwprintf	_ Vsntprintf
Windows	WvsprintfA	WvsprintfW	Wvsprintf

 

Function usage:

 

The functions listed in the preceding table are the most important and commonly used:

1. the maximum length of the number of parameters:

Prototype: int _ snprintf (char * _ Dest, size_t _ Count, const char * _ Format ,...)

_ Count indicates the maximum number of characters that can be stored in the target address space.

Example:

1. char szBuffer [100];

2. _ snprintf (szBuffer, sizeof (szBuffer), "The sum of % I and % I is % I", 5, 3, 5 + 3 );

 

2. Maximum length of the indicator of the parameter array:

Prototype: int _ vsnprintf (char * _ Dest, size_t _ Count, const char * _ Format, va_list _ Args)

_ Count indicates the maximum number of characters that can be stored in the target address space,

Va_list is the type defined by the C standard library.

Example: in fact, one possible internal implementation method of the _ snprintf function is to use the _ vsnprintf function for implementation:

1. int _ snprintf (char * szBuffer, size_t count, const char * szFormat ,...)

2 .{

3. int iReturn;

4. va_list pArgs;

5. va_start (pArgs, szFormat );

6. iReturn = _ vsnprintf (szBuffer, count, szFormat, pArgs );

7. va_end (pArgs );

8. return iReturn;

}

From: blog