I am looking for the simple way or some way to convert a string to LPCTSTR because lately I have problems with this. For example, I have any string:
string welcome;
And I want to use this string in my LPCTSTR .
LPCTSTR ejemplo = "aqui vendría mi string welcome compatible con LPCTSTR";
But I can not make it compatible.
First, we must know what daemons is a LPCTSTR .
LPCTSTR . It's just a constant pointer to char or wchar_t hidden after an alias:
The most confusing part is the T char, which turns out to be another alias with the particularity that defines one or the other type of char depending on whether the macro UNICODE is or is not defined : if the type TCHAR is defined, it will be an alias of WCHAR 1 and it will not be an alias of char .
As for the long pointer part ( L ong P ointer) is a distinction between 16-bit pointers (short pointer) and 32-bit pointers (long pointer), if I'm not mistaken the short pointers are in disuse and are a remnant of the Windows platforms of 16 bits.
So your code:
LPCTSTR ejemplo = "aqui vendría mi string welcome compatible con LPCTSTR";
It would be equivalent to:
const char *ejemplo = "aqui vendría mi string welcome compatible con LPCTSTR";
Or, with UNICODE defined:
const wchar_t *ejemplo = "aqui vendría mi string welcome compatible con LPCTSTR";
You forgot to post the compilation error you have, so I'll try to guess what it is.
What you are doing is:
string welcome;
const char *ejemplo = welcome;
Or, with UNICODE defined:
string welcome;
const wchar_t *ejemplo = welcome;
You are confusing the string object with a text string literal ( const char * o const wchar_t * ) which are different types and the compiler does not like:
error: cannot convert 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}' to 'const char*' in initialization error: cannot convert 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}' to 'const wchar_t*' in initialization
The object string is a class that stores a text string in an internal buffer, manages the life cycle of said buffer and offers additional functionalities for its management and management. A character pointer ( char or wchar_t ) is a basic type.
If you want to access the internal data of a string object you should use the string::data or string::c_str ; these methods return a pointer to the beginning of the buffer that contains the string 2 .
string welcome;
LPCTSTR ejemplo = welcome.c_str(); // equivalente a const char *ejemplo
Or, with UNICODE defined:
wstring welcome;
LPCTSTR ejemplo = welcome.c_str(); // equivalente a const wchar_t *ejemplo
Notice that in the case of being in UNICODE the string must be of wide characters (wide string: wstring ).
Use things as they are with the tools offered by the C ++ language itself:
string welcome;
const char *normal = welcome.c_str();
wstring wwelcome;
const wchar_t *unicode = wwelcome.c_str();
string , I do not know what use you want to give the LPCTSTR ejemplo but pointing to the internal data of an object is very prone to errors (for example: if destroy welcome the pointer ejemplo will still point to the same place even though the memory has been erased) use the object string directly. 1 Which in turn will be an alias of wchar_t or unsigned short depending on whether the platform for which it is compiled has native support for wide characters or not.
2 The standard states that string::c_str must return a pointer to a character string ending in a null character, whereas string::data did not have this guarantee until after C ++ 11. p>