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UNICODE 2 ANSI conversions...

Posted on 1999-01-22
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How can I get the value from an UNICODE string converted to a char * or CString?
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Question by:danoneb
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9 Comments
 

Author Comment

by:danoneb
ID: 1328193
i would appreciate some code sample.... :)
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Accepted Solution

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jkr earned 800 total points
ID: 1328194
This function does what you need:

char* ANSIStringFromUNICODE( LPOLESTR pszOLE)
{
HRESULT hResult;

static char acBuffer[ BUFFER_MAX];


    hResult =   ::WideCharToMultiByte   (   CP_ACP,
                                            0,
                                            pszOLE,
                                            -1,
                                            acBuffer,
                                            sizeof  (   acBuffer),
                                            NULL,
                                            NULL
                                        );


    if  (   FAILED  (   hResult))
            return  (   NULL)

    return ( acBuffer);
}


Feel free to ask if you have further questions on this issue ;-)
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Expert Comment

by:jkr
ID: 1328195
Ooops, i forgot: To assign it to a CString, you could simply use 'CString::operator=' (i.e. assign it directly) or modify the function slightly:

CString CStringFromUNICODE( LPOLESTR pszOLE)
{
HRESULT hResult;
CString strResult;
char acBuffer[ BUFFER_MAX];


    hResult =   ::WideCharToMultiByte   (   CP_ACP,
                                            0,
                                            pszOLE,
                                            -1,
                                            acBuffer,
                                            sizeof  (   acBuffer),
                                            NULL,
                                            NULL
                                        );


    if  (   FAILED  (   hResult))
            return  (   strResult)

    strResult = acBuffer;

    return ( strResult);
}

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Expert Comment

by:chensu
ID: 1328196
You may also use the W2A macro implemented in ATL, which actually calls WideCharToMultiByte for you.

USES_CONVERSION;

LPWSTR lpwStr = L"ABC";
char *pszConverted = W2A(lpwStr);
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Expert Comment

by:jkr
ID: 1328197
chensu - you're of course right, but you'll agree that the above code is merely a 'rollout' of that what W2A accomplishes...
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Author Comment

by:danoneb
ID: 1328198
Sorry, i forgot to specify:
I need to get the content from a CComBSTR object...
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LVL 86

Expert Comment

by:jkr
ID: 1328199
This makes no difference - a BSTR is mainly typedef'd as

typedef OLECHAR *BSTR;
(see wtypes.h, i just left out the RPC stuff)

So, you could use either CComBSTR::m_str directly or detach the BSTR using CComBSTR::Detach().
OR: simply call the functions above using the ( BSTR) typecast on your CCOmBSTR object...
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LVL 86

Expert Comment

by:jkr
ID: 1328200
To make it clearer (still from wintypes.h):

typedef OLECHAR *LPOLESTR;
typedef OLECHAR *BSTR;

So you see, a BSTR is the same as LPOLESTR...

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Expert Comment

by:chensu
ID: 1328201
jkr,

>but you'll agree that the above code is merely a 'rollout' of that what W2A accomplishes...

Yes, agreed. I mentioned "which actually calls WideCharToMultiByte for you.".

danoneb,

>I need to get the content from a CComBSTR object...

In this case, you can make use of _bstr_t class that has an overloaded operator char*().

#include <comdef.h>

CComBSTR bstrData1;

_bstr_t bstrData2(bstrData1, false);

// Then use bstrData2 in place of char *

You need to use try-catch to capture the possible exceptions because both the constructor and the operator might throw _com_error.
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