what is Difference between CStringW and LPTSTR?

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Hi All,
What is difference between CStringW and lptstr
or
between CStringA and lpstr?
sorry, I know this question is very simple and basic but please answer.
Thanks

Posted 12-Oct-13 0:52am

Hanoi 2014

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pasztorpisti 12-Oct-13 14:56pm

You won't understand the real purpose of these types without understanding encoding (like windows1252, utf8, utf16, shift-jis, ...) of (unicode) text first.

Hanoi 2014 13-Oct-13 1:03am

I know all of this, I can't understand where to use them in type casting. this is my problem.

pasztorpisti 13-Oct-13 8:51am

If you know encodings and basic C/C++ programming then you wouldn't be here with these questions.

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abbaspirmoradi · Answer 1 · 2013-10-12T01:25:00

Solution 1

Look at this:

https://groups.google.com/forum/#!topic/microsoft.public.vc.mfc/VFDxz5XGyPU[^]

Posted 12-Oct-13 1:25am

abbaspirmoradi

Richard MacCutchan · Answer 2 · 2013-10-12T03:08:00

Solution 2

CString is a class (MFC/ATL) that handles character data (strings). The A version is restricted to ASCII characters (8 bit), while the W version handles Unicode (16 bit). LPTSTR is a Windows definition for TCHAR* which is a pointer to a character string. The T types will be generated as ASCII or Unicode depending on the compiler settings. LPSTR is a Windows definition for char* and is ASCII only.

Posted 12-Oct-13 3:08am

Richard MacCutchan

Comments

Hanoi 2014 13-Oct-13 1:03am

I know all of this, but I can't use them in type casting.

Richard MacCutchan 13-Oct-13 5:47am

That all depends on what you are trying to do. You can cast a CString to an LPTSTR or an LPSTR, as appropriate, since that is handled by operator overloading. You cannot cast in the other direction, as casting from a pointer to an object makes no sense.

Hanoi 2014 13-Oct-13 5:59am

struct userdata
{
char sUserName[20];
char sMsg[1000];
};

CString sUserName;
sUserName.Format(L"%S : %S", udata->strUserName,udata->strMsg);
it gives <badptr>
sometimes it works but sometimes doesn't.
I don't know where is my problem?

Richard MacCutchan 13-Oct-13 6:27am

sometimes it works but sometimes doesn't.
I don't think anyone else would be able to guess either with that little information.

Hanoi 2014 13-Oct-13 6:38am

OK, Thanks I think my problem is about basic topic.

Hanoi 2014 13-Oct-13 6:45am

sorry, as I understand, I think you are a good developer, can you propose a project that uses professional mfc or c++ topic like: inheritance, thread ,...?
Thanks

Richard MacCutchan 13-Oct-13 6:50am

I have no idea what sort of project you have in mind, and you can create anything with C++/MFC. Try a subject that you are interested in, and maybe create a catalog or contact list etc. There are lots of articles here on CodeProject that will help you.

Hanoi 2014 13-Oct-13 6:52am

Thanks very much.