How do the two LPCTSTR values ​​add up?

freddie0410

How do the two LPCTSTR values ​​add up?
E.g
LPCTSTR a1 = _T ("a");
LPCTSTR a2 = _T ("a2");
LPCTSTR a3;

How to add a1 and a2 to a3

Thank you:)

echg2002

strcat
wcscat

深蓝旅者

#include <string>

std :: basic_string <TCHAR> s1 = a1;
std :: basic_string <TCHAR> s2 = a2;
std :: basic_string <TCHAR> s3 = s1 + s2;
LPCTSTR a3 = s3.c_str ();

51448240

strcat (a1, a2); //string concatenation function
a3=a1;

gmj_201

strcat (a1, a2);
a3=a1;

kakaroter

Never use strcat, because strcat will modify the content of a1, which means that the first parameter must not be const.
Note that your string is a constant pointer and it points to a string constant. The data stored in the constant area cannot be modified.
And your a3 has no allocated space at all.
First, a3 should be defined as LPTSTR, otherwise it is a constant and cannot be modified. Then use:
a3 = (TCHAR *) malloc(255 * sizeof(TCHAR));
strcpy (a3, a1);
strcat (a1, a2);
That's it.

猪立叶

a3 = CString(a1) + a2;