String CString char star

2020-04-01 21:36:39
OfStack

String, CString,char star

Turn int cstrings:
Cstrings. The Format (" % d ", int).
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Turn the string cstrings
Cstrings. The format (" % s ", string c_str ());
C_str () is better than data().
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Char * cstrings
Cstrings. The format (" % s ", char *);
Cstrings strtest;
Char * charpoint;
Charpoint = "difference string a value";
Strtest = charpoint; // pay the price directly
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Cstrings turn int
CString Ss = "1212.12";
Int temp = atoi (ss); / / atoi _atoi64 or atol

To convert a character to an integer, you can use atoi, _atoi64, or atol.
Int int_chage = atoi((LPCSTR)ss);
Or:
Cstrings STR = "23";
UINT UINT;
Sscanf (STR, "% d", uint);
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String to an int
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Char * int
# include < Stdlib. H>

Int atoi (const char * NPTR);
Long atol (const char * NPTR);
Long long atoll(const char * NPTR);
Atoq (const char * NPTR);
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Turn cstrings string
String s (cstrings GetBuffer ());
Be sure to release the buffer () after GetBuffer(), otherwise there is no space to free the buffer.
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Int to a string
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Char * string
String s (char *);
You can only initialize yours, and it is best to assign() where it is not initialized.
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Cstrings char *


 CString strtest="wwwwttttttt";
 charpoint=strtest.GetBuffer(strtest.GetLength());
CString conversion  char[100] 
 char a[100]; 
 CString str("aaaaaa"); 
 strncpy(a,(LPCTSTR)str,sizeof(a));
  CString  str="aaa";  
  char*  ch;  
  ch=(char*)(LPCTSTR)str;

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Char * int
There's a function in stdlib.h called itoa()
Usage of itoa:
Itoa (I, num, 10);
The number that I need to convert to characters
The variable that holds the character after num conversion
10 converts the base (base) of a number. It could be 2,8,16, whatever you like
Char *itoa(int value, char* string, int radix);
Example:


 #include "stdlib.h"
 #include "stdio.h"
 main()
 {
 int i=1234;
 char s[5];
 itoa(i,s,10);
 printf("%s",s);
 getchar();
}

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Char * string


char *p = string.c_str(); 

 string aa("aaa");
 char *c=aa.c_str();
 string mngName ; 
 char t[200];
 memset(t,0,200);
 strcpy(t,mngName.c_str());

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Standard C does not have string,char *==char []==string
Format("%s",char *) is used to convert char * to CString. To convert a CString to a char star, use the operator
The operator (LPCSTR) CString will do.
Cannot convert from 'const char *' to 'char *'
Const char * c = aa. C_str ();
String. C_str () can only be converted to const char *

CString header #include < Afx. H>
String header #include < String. H>

Cstrings char *

Cstrings CSTR.

Char * p = (LPSTR) (LPCTSTR CSTR);

Turn the string cstrings
Cstrings. The format (" % s ", string c_str ());

Char turn cstrings
Cstrings. The format (" % s ", char *);

Turn char string
String s (char *);

Char * string
Char * p = string. C_str ();

Turn cstrings string
String s (cstrings GetBuffer ());

1, the string - > cstrings
Cstrings. The format (" % s ", string c_str ());
C_str () is better than data().
2, char - > The string
String s (char *);
Assign () is best used where it is not initialized.
3, cstrings - > The string
String s (cstrings GetBuffer ());
Be sure to release the buffer () after GetBuffer(), otherwise there is no space to free the buffer.

C++ standard function library
There are three functions that convert the contents of a string to an array of characters and C strings
1. Data (), returns an array of strings without "/0"
2,c_str(), returns an array of strings with "/0"
3, the copy ()

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Conversion between CString and int, char*, char[100] -

Int cstrings transfers

To convert a character to an integer, you can use atoi, _atoi64, or atol.
To convert Numbers to CString variables, you can use the Format function of CString. Such as
Cstrings s;
Int I = 64;
S. ormat (" % d ", I)
The Format function is very powerful, it is worth your research.

Void CStrDlg: : OnButton1 ()
{
// TODO: Add your control notification handler code here
cstrings
Ss = "1212.12";
Int temp = atoi (ss);
Cstrings aa;
Aa. The Format (" % d ", temp);
AfxMessageBox("var is "+ aa);
}

Sart. The Format (" % s ", buf);

Char * cstrings transfers

/ / / char * TO cstrings
Cstrings strtest;
Char * charpoint;
Charpoint = "difference string a value";
Strtest = charpoint;

/ / / cstrings TO char *