LPCTSTR conversion

[fooshm]

Hello,
I'm trying to convert a String^ to LPCTSTR.
When using :
LPCTSTR str =
static_cast<LPCTSTR>(Marshal::StringToHGlobalAnsi(gcString).ToPointer());
in order to convert how ever I'm receiving junk string.

When using a longer cast example I found on the net:
lpsConverted = static_cast<LPCTSTR>(const_cast<void*>(static_cast<const

void*>(System::Runtime::InteropServices::Marshal::StringToHGlobalAnsi(sString))));

I'm also receiving junk.

Currently the only way to do it is using CString cast:
CString* tmpStr = new CString(sString);
return (LPCTSTR)(*tmpStr);

I'm probably missing something on my Marshal code, does anyone have a
clue ?

Thank you,
Efi

 

[Jochen Kalmbach [MVP]]

Hi fooshm!

Currently the only way to do it is using CString cast:
CString* tmpStr = new CString(sString);
return (LPCTSTR)(*tmpStr);

See:
http://www.c-plusplus.de/forum/viewtopic-var-t-is-158664.html

(It's in german, but the code should be readable for you...)

--
Greetings
Jochen

My blog about Win32 and .NET
http://blog.kalmbachnet.de/

 

[fooshm]

Hi,
Thank you for your help, it works.
I guess my error was trying to static cast it to LPCTSTR and not to
char*.

I wonder why is it so important ?

Efi


Jochen Kalmbach [MVP] כתב:

 

[SvenC]

Hi fooshm,

Hi,
Thank you for your help, it works.
I guess my error was trying to static cast it to LPCTSTR and not to
char*.

I wonder why is it so important ?

It might be a wrong assupmtion about your string encoding being Ansi or
Unicode. Check you project properties if your ar using multi byte or unicode
encoding.

Looking at your original post your use:

LPCTSTR str =
static_cast<LPCTSTR>(Marshal::StringToHGlobalAnsi(gcString).ToPointer());

StringToHGlobalAnsi as the name indicates will return Ansi encoding but your
cast LPCTSTR will cast to either const char* or const wchar_t* depending on
your Unicode setting.

The link given by Jochen shows code which checks the _UNICODE define to also
create a T-version which calls the correct function based on that define.