TCHAR issue

[Lost User]

What do you mean by convert? TCHAR* is merely a pointer to a char or wchar_t depending on the definition of UNICODE. LPCTSTR is a typedef to const TCHAR* so no conversion is necessary; but you may need a cast to satisfy the compiler. TCHAR is a single character so cannot be converted or cast to LPTSTR; if you actually meant TCHAR* then both expressions evaluate to the same thing: a pointer to a character or wide character.

Just say 'NO' to evaluated arguments for diadic functions! Ash

[goldenrose9]

Thanx, my one doubt is cleared, about TCHAR to LPTSTR My Program deals with UNICODE only a small example will very helpfull for me, of how to convert TCHAR* to LPCTSTR and LPTSTR. Thanx in advance.

gold

[Roger Broomfield]

TCHAR* to LPCTSTR is a simple typecast

TCHAR* pch;
LPCTSTR pcch = (LPCTSTR)pch;

TCHAR to LPTSTR is an address of operator

TCHAR ch;
LPTSTR pch = &ch;

[Lost User]

goldenrose9 wrote:

a small example will very helpfull for me, of how to convert TCHAR* to LPCTSTR and LPTSTR.

There is no conversion involved; as I said in my previous post TCHAR* and LPTSTR equate to the same thing, a pointer to a string (character array). LPCTSTR is the same as const TCHAR*, a pointer to a string constant.

Just say 'NO' to evaluated arguments for diadic functions! Ash

[goldenrose9]

LPTSTR __stdcall gHelp(TCHAR value)
{
LPTSTR pch;
pch = &value;
return pch;
}

compiler gives warning
warning C4090: 'return' : different 'const' qualifiers

gold

[Cedric Moonen]

Here[^] is an excellent article explaining everything you need to understand C++ strings.

Cédric Moonen Software developer
Charting control [v3.0] OpenGL game tutorial in C++

[Lost User]

You will also have a problem that you are returning a TCHAR* to a TCHAR value, not an array (i.e. string). Do not do this or you will end up with memory overwrites and/or invalid data. As to your compiler warning, you must have a definition of gHelp which reads something like:

LPCTSTR __stdcall gHelp(TCHAR value);

Just say 'NO' to evaluated arguments for diadic functions! Ash

[Rajesh R Subramanian]

goldenrose9 wrote:

TCHAR* to LPCTSTR

Usually, no conversion needed. If a function is promising you that it won't modify the contents (thereby expecting an LPCTSTR), you can still pass on a normal TCHAR* to it.

goldenrose9 wrote:

TCHAR to LPTSTR

That makes absolutely no sense. TCHAR is a character (wide or not depends on the build), and LPTSTR is a pointer to one such character. How can you convert one to another?!

It was ever thus, the Neophiles will always rush out and get 'The Latest Thing' at a high price and with all the inherent faults - Dalek Dave.

[goldenrose9]

thanx a lot.

gold

[Stefan_Lang]

This won't work. You are passing the TCHAR variable by value, so the parameter value is just a temporary local copy, and the address of it will be invalidated upon return! Pass the TCHAR parameter by reference instead, like this:

LPTSTR __stdcall gHelp(TCHAR& value)
...