Cstring to char *, string

Cstring header file # include <afx. h>

String header file # include <string. h>

 

1. Convert cstring to char *

Cstring CSTR;

Char * P = (lpstr) (lpctstr) CSTR;

2. Convert string to cstring
Cstring. Format ("% s", String. c_str ());

C_str () is indeed better than data.

3. Convert Char to cstring
Cstring. Format ("% s", char *);

4. Convert Char to string
String S (char *);

Only Initialization is allowed. It is best to use assign () instead of initialization ().

5. Convert string to char *
Char * P = string. c_str ();

6. Convert cstring to string
String S (cstring. getbuffer ());

Releasebuffer () is required after getbuffer (). Otherwise, no space occupied by the buffer is released.

―――――――――――――――――――――

As mentioned in C ++ standard function library
There are three functions that can convert the content of a string to a character array and a C-string
1. Data (), returns a string array without "/0"
2. c_str (), returns a string array with "/0"
3. Copy ()

―――――――――――――――――――――

 

Conversion between cstring and INT, char *, and char [100 --

1. cstring mutual int Conversion

(1) convert the character to an integer. You can use atoi, _ atoi64, or atol.
(2) convert numbers to cstring variables. You can use the format function of cstring. For example
Cstring S;
Int I = 64;
S. Format ("% d", I)
The format function is very powerful and worth your research.

Voidcstrdlg: onbutton1 ()
{
// Todo: add your control notificationhandler code here
Cstring
Ss = "1212.12 ″;
Int temp = atoi (SS );
Cstring AA;
AA. Format ("% d", temp );
Afxmessagebox ("VaR is" + AA );
}

Sart. Format ("% s", Buf );

 

2. Convert cstring to char *

Cstring strtest;
Char * charpoint;

/// Char * To cstring
Charpoint = "give string a value ";
Strtest = charpoint;

/// Cstring to char *
Charpoint = strtest. getbuffer (strtest. getlength ());

There is no string in Standard C, char * = char [] = string

You can use the cstring. Format ("% s", char *) method to convert char * To cstring. To convert cstring to char *, use the operator (lpcstr) cstring.

 

3. cstring conversion char [100]

/// Char [2, 100] tocstring

Char A [100];
Cstring STR ("aaaaaa ");

// Cstring to Char [100]

Strncpy (A, (lpctstr) STR, sizeof ());

Cstring to char *, string