🚀 go-pugleaf

In article <4djn2d$mps@earth.superlink.net>, ananda@mars.superlink.net (Ananda Subramaniam) writes:
|> Hi,
|> 
|> I have an OLE sample that I wrote and compiled in VC++ 2.0 without any problems.
|> However, when I tried to compile in VC++ 4.0, I had trouble with the
|> StringFromCLSID function. 
|> 
|> I get a message "cannot convert 2nd parameter char ** to unsigned short**"
|> 
|> The Prototype for StringFromCLSID is:
|> StringFromCLSID(REFCLSID, LPOLESTR *);
|> 
|> I am passing as my second parameter a LPSTR *, which shouldn't be a problem
|> because grepping through the several include files provided by MS there is a
|> typedef as follows
|> 
|> typedef LPSTR LPOLESTR;

In the file wtypes.h there are also typedefs for
   typedef WCHAR OLECHAR
   typedef const OLECHAR *LPOLESTR;

All OLE functions use unicoded string arguments. Probably your VC++ 2.0
settings included the define OLE2ANSI to use ansi strings.

You should use the function MultiByteToWideChar(...) to convert an ansi
string to a unicode string.

This should help you out !

greetings,
-- 
# Jeroen Nikkels                          Baan Development B.V.     #
# Technology Development                  Baron van Nagellstraat 89 #
# Phone: +31 (0)342 428808                P.O. Box 143              #
# Fax  : +31 (0)342 428787                3770 AC Barneveld         #
# Email: jeroenn@baan.nl                  The Netherlands           #

In article <4djn2d$mps@earth.superlink.net>,
   ananda@mars.superlink.net (Ananda Subramaniam) wrote:
>Hi,
>
>I have an OLE sample that I wrote and compiled in VC++ 2.0 without any 
problems.
>However, when I tried to compile in VC++ 4.0, I had trouble with the
>StringFromCLSID function. 
>
>I get a message "cannot convert 2nd parameter char ** to unsigned short**"
>
>....
>The compiler seems to think that LPOLESTR is of type unsigned short.
>To further confirm this, I changed the type of my string to LPOLESTR and the 
>compiler went past StringFromCLSID function but complained on the next line
>where I had AfxMessageBox(mystr).  The compiler said "non of the 2 overloads 
can
>covert parameter one from type unsigned short * "
>
>...

>I am running out of ideas, plus it does not help being the only C++ 
programmer
>in the office.   Any help will be appreciated.

>Ananda
>email: ananda@mars.superlink.net

Ananda,

One major change between VC++ 2.0 and VC++ 4.0 is the support for Unicode. All 
OLE functions require Unicode strings. That's why it wants and "unsigned 
short**". 2.x provided this translation for you, but 4.0 does not. Check out 
Tech Note 59. And if you need source examples, check out my FAQ under "General 
Questions"/"Converting from 2.0 to 4.0" at http://www.sky.net/~toma.

TwA

Ananda Subramaniam wrote:
> 
> Hi,
> 
> I have an OLE sample that I wrote and compiled in VC++ 2.0 without any problems.
> However, when I tried to compile in VC++ 4.0, I had trouble with the
> StringFromCLSID function.
> 
> I get a message "cannot convert 2nd parameter char ** to unsigned short**"
> 
> The Prototype for StringFromCLSID is:
> StringFromCLSID(REFCLSID, LPOLESTR *);
> 
> I am passing as my second parameter a LPSTR *, which shouldn't be a problem
> because grepping through the several include files provided by MS there is a
> typedef as follows
> 
> typedef LPSTR LPOLESTR;
> 
> The compiler seems to think that LPOLESTR is of type unsigned short.
> To further confirm this, I changed the type of my string to LPOLESTR and the
> compiler went past StringFromCLSID function but complained on the next line
> where I had AfxMessageBox(mystr).  The compiler said "non of the 2 overloads can
> covert parameter one from type unsigned short * "
> 
> After this, I went and modified the header file that has the prototype for
> StringFromCLSID (objbase.h) and modified the prototype from LPOLESTR to LPSTR
> and the app compiled and sort of worked.
> 
> I am running out of ideas, plus it does not help being the only C++ programmer
> in the office.   Any help will be appreciated.
> 
> Ananda
> email: ananda@mars.superlink.net

This little problem bugged me too.
There is an easy way to convert- 
If you include afxpriv.h there are conversion macros that will allocate 
memory perform the necessary conversion and return the proper pointer.

here is a little sample from my junk...

#include "afxpriv.h"

void CBaseObjectApp::RegisterServer(void)
{
    OLECHAR     szID[128];
    TCHAR       szCLSID[128];
    TCHAR       szModule[512];
    USES_CONVERSION;			<< this initializes some vars

    StringFromGUID2(CLSID_ChatSrv, (LPOLESTR)szID, 128); << LPOLESTR is 
what is expected
    lstrcpy(szCLSID, TEXT("CLSID\\"));
    lstrcat(szCLSID, OLE2CT(szID)); 	<< OLE2CT performs a conversion
					<< and returns the correct 
					<< pointer
					<< check it out
I still need to compile with MBCS and have had no luck compileing with
_UNICODE defined but that is another headache.
Microsoft - "Do it our way until we tell you otherwise"

later 
johnp