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From: Manni on 8 Oct 2009 17:49
Hi ...
How can I convert const char * to wchar_t?
Example: char *argv[] is my array and i want it to pass to different
file which accept only WCHAR **argv where WCHAR is defined as typedef
wchar_t WCHAR

Thanks
From: Tom Serface on 8 Oct 2009 18:37
Since are using MFC, you could just assign it to a CString (or CStringW if
you are using an ANSI built).

Tom

"Manni" <manujsabarwal(a)gmail.com> wrote in message
news:1c420830-306c-4435-aa12-c7751db9ef07(a)p10g2000prm.googlegroups.com...
> Hi ...
> How can I convert const char * to wchar_t?
> Example: char *argv[] is my array and i want it to pass to different
> file which accept only WCHAR **argv where WCHAR is defined as typedef
> wchar_t WCHAR
>
> Thanks

From: David Lowndes on 8 Oct 2009 18:40
>How can I convert const char * to wchar_t?

You need to use MultiByteToWideChar - probably the easiest way is
through one of the macros like CA2W - have a look at "ATL and MFC
String Conversion Macros" in MSDN.

Dave
From: Giovanni Dicanio on 9 Oct 2009 02:23


"Manni" <manujsabarwal(a)gmail.com> ha scritto nel messaggio
news:1c420830-306c-4435-aa12-c7751db9ef07(a)p10g2000prm.googlegroups.com...

> How can I convert const char * to wchar_t?
> Example: char *argv[] is my array and i want it to pass to different
> file which accept only WCHAR **argv where WCHAR is defined as typedef
> wchar_t WCHAR

To convert from char* (ANSI/MBCS) strings to wchar_t* (Unicode UTF-16)
strings, you could use CStringW constructor overload, or CA2W helper class,
or the "raw" Win32 API ::MultiByteToWideChar.

Here is a sample compilable code that shows you a possible way to convert
from char** argv to a WCHAR** 'argv':

<code>
//////////////////////////////////////////////////////////////////////////
// test1.cpp


#include <iostream> // Console output
#include <vector> // Vector container
#include <atlstr.h> // CStringW


using std::cout;
using std::wcout;
using std::endl;


//
// Prints strings stored in argv
//
void TestUnicodeArgv( WCHAR **argv )
{
wcout << endl;
wcout << "*** Unicode strings:" << endl;
WCHAR ** p = argv;
while ( *p != NULL )
{
wcout << *p << endl;
++p;
}
wcout << "----------" << endl;
}


//
// MAIN
//
int main(int argc, char * argv[])
{
//
// Convert strings from ANSI/MBCS
// to Unicode UTF16, storing them in a vector container
//
std::vector< CStringW > unicodeStrings;
unicodeStrings.reserve( argc );
for ( int i = 0; i < argc; i++ )
{
unicodeStrings.push_back( CStringW( argv[i] ) );
}

//
// Build an array of pointers to Unicode strings,
// NULL terminated
//
const int count = argc;
std::vector< WCHAR * > unicodeStringPtrs;
unicodeStringPtrs.reserve( count + 1 );
for (int i = 0; i < count; i++)
{
unicodeStringPtrs.push_back( const_cast<WCHAR
*>(unicodeStrings[i].GetString()) );
}
// Terminate with NULL
unicodeStringPtrs.push_back( NULL );

// Call the test function
TestUnicodeArgv( &unicodeStringPtrs[0] );


return 0;
}

</code>

HTH,
Giovanni


From: Goran on 9 Oct 2009 03:04
On Oct 8, 11:49 pm, Manni <manujsabar...(a)gmail.com> wrote:
> Hi ...
> How can I convert const char * to wchar_t?
> Example: char *argv[] is my array and i want it to pass to different
> file which accept only WCHAR **argv where WCHAR is defined as typedef
> wchar_t WCHAR
>
> Thanks

const char* MBCSData = Whatever();
{
CStringW WideCharStr(MBCSData);
wchar_t* UTF16Data = WideChar.GetBuffer(WideCharStr.GetLength());
// you can freely use UTF16Data while in this block, but you better
not pass it outside,
// because it will be deleted when WideCharStr goes out ot of scope.
}

You can use CA2W or MultiByteToWideChar, but I see little purpose of
that in context of MFC.

CA2W is better due to the use of a static buffer when strings are
short (CString always uses heap), but in the context of MFC, going
from that to CString(A/W) might still prove more costly, and
MultiByteToWideChar is an even bigger PITA.

Only when you want more control (e.g. want to specify code page etc),
you have to drop lower to these two.

Goran.
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