CStringT conversion issue
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From: Eric Margheim on 10 Apr 2007 11:53 I have a dumb question... :-) I am converting an app to VS2005 and have inherited some legacy code that is a class inherited from CString. It references m_pchData quite a bit. I am trying to use GetString() instead but am running into variable conversion issues. LPTSTR lpsz, lpszRemainder = GetString(), lpszret; This fails with the following: 1>.\stringex.cpp(294) : error C2440: 'initializing' : cannot convert from 'const char *' to 'LPTSTR' How can I convert the GetString() to the LPTSTR? I really don't want to rewrite any more than I have to to get this to compile. Thanks
From: AliR (VC++ MVP) on 10 Apr 2007 12:00 GetString returns a const pointer. Try PCTSTR or LPCSTR AliR. "Eric Margheim" <NOSPAM***eric(a)prism-grp.com***NOSPAM> wrote in message news:Oq83Ai4eHHA.1252(a)TK2MSFTNGP04.phx.gbl... >I have a dumb question... :-) > > I am converting an app to VS2005 and have inherited some legacy code that > is a class inherited from CString. It references m_pchData quite a bit. > I am trying to use GetString() instead but am running into variable > conversion issues. > > LPTSTR lpsz, lpszRemainder = GetString(), lpszret; > > This fails with the following: > > 1>.\stringex.cpp(294) : error C2440: 'initializing' : cannot convert from > 'const char *' to 'LPTSTR' > > How can I convert the GetString() to the LPTSTR? I really don't want to > rewrite any more than I have to to get this to compile. > > Thanks >
From: David Wilkinson on 10 Apr 2007 13:12 Eric Margheim wrote: > I have a dumb question... :-) > > I am converting an app to VS2005 and have inherited some legacy code that is > a class inherited from CString. It references m_pchData quite a bit. I > am trying to use GetString() instead but am running into variable conversion > issues. > > LPTSTR lpsz, lpszRemainder = GetString(), lpszret; > > This fails with the following: > > 1>.\stringex.cpp(294) : error C2440: 'initializing' : cannot convert from > 'const char *' to 'LPTSTR' > > How can I convert the GetString() to the LPTSTR? I really don't want to > rewrite any more than I have to to get this to compile. > > Thanks Eric: This looks like a Unicode mismatch or const mismatch, or both. What is GetString() ? Inheriting from CString is generally thought not to be a good idea. -- David Wilkinson Visual C++ MVP
From: Eric Margheim on 10 Apr 2007 12:24 "David Wilkinson" <no-reply(a)effisols.com> wrote in message news:e6YKer4eHHA.4868(a)TK2MSFTNGP06.phx.gbl... > Eric Margheim wrote: > >> I have a dumb question... :-) >> >> I am converting an app to VS2005 and have inherited some legacy code that >> is a class inherited from CString. It references m_pchData quite a bit. >> I am trying to use GetString() instead but am running into variable >> conversion issues. >> >> LPTSTR lpsz, lpszRemainder = GetString(), lpszret; >> >> This fails with the following: >> >> 1>.\stringex.cpp(294) : error C2440: 'initializing' : cannot convert from >> 'const char *' to 'LPTSTR' >> >> How can I convert the GetString() to the LPTSTR? I really don't want to >> rewrite any more than I have to to get this to compile. >> >> Thanks > > Eric: > > This looks like a Unicode mismatch or const mismatch, or both. > > What is GetString() ? > > Inheriting from CString is generally thought not to be a good idea. > GetString is a CSimpleStringT function. I know it's a bad idea but I'm trying to avoid rewriting the code that leverages the CStringEx class. I was hoping I could do some quick bandaid work and move on. We will be replacing this application soon anyhow.
From: Doug Harrison [MVP] on 10 Apr 2007 12:25
On Tue, 10 Apr 2007 10:53:30 -0500, "Eric Margheim" <NOSPAM***eric(a)prism-grp.com***NOSPAM> wrote: >I have a dumb question... :-) > >I am converting an app to VS2005 and have inherited some legacy code that is >a class inherited from CString. It references m_pchData quite a bit. I >am trying to use GetString() instead but am running into variable conversion >issues. > >LPTSTR lpsz, lpszRemainder = GetString(), lpszret; That initialization syntax is bogus. >This fails with the following: > >1>.\stringex.cpp(294) : error C2440: 'initializing' : cannot convert from >'const char *' to 'LPTSTR' > >How can I convert the GetString() to the LPTSTR? I really don't want to >rewrite any more than I have to to get this to compile. If the original fragile code actually worked, then you can try a const_cast to cast away the constness, e.g. LPTSTR s = const_cast<LPTSTR>(GetString()); Just don't write into s, and be aware that s may be invalidated (can't tell from the docs) by modifications to the CString. If you need to write to the string data, use GetBuffer/GetBufferSetLength to obtain a legitimate non-const pointer to the data. -- Doug Harrison Visual C++ MVP |