please help us to convert PString object content to char * in VC++.
hi sir/modem Many thanks for your last regards, I have a problem about data conversion.
i need to convert PString (a class exist in pstring.h inside ptlib package) object content to char * but How can i do this ? for more clearance i write the real code below:
inline bool operator==(const PString & other) const { return CString::Compare(other); }
i need to convert other object content to wchar_t * but when run this code it have below error in VC++ 2005 .
error C2664: 'ATL::CStringT<BaseType,StringTraits>::Compare' : cannot convert parameter 1 from 'const PString' to 'const wchar_t *'
Please help me to solve this problem.
I am in wait for your response.
Best regards.
Zahra.
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Hi
Here in the documentation http://www.opalvoip.org/docs/ptlib-v2_7/classPString.html. Section Conversion Functions u have a "operator const unsigned char *() const". This method converts PString in a char* string (PTLib uses multibyte string of chars -MBSC-)
so for conversion is simple like:
PString p("Hello World"); const char *p2 = (const char *)p;
Regards. Marcos F. Jardini
2009/10/29 ZAHRA dehghanianfard zahra_d84@yahoo.com
hi sir/modem Many thanks for your last regards, I have a problem about data conversion. i need to convert PString (a class exist in pstring.h inside ptlib package) object content to char * but How can i do this ? for more clearance i write the real code below:
inline bool operator==(const PString & other) const { return CString::Compare(other); } i need to convert other object content to wchar_t * but when run this code it have below error in VC++ 2005 .
error C2664: 'ATL::CStringT<BaseType,StringTraits>::Compare' : cannot convert parameter 1 from 'const PString' to 'const wchar_t *'
Please help me to solve this problem. I am in wait for your response. Best regards. Zahra.
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You question says how to convert to char *, but the error is the conversion to wchar_t *. They are quite different.
A PString is always UTF-8 (8 bits per character) and wchar_t is 16 bits (possibly more) per character. A CString in MFC is sometimes 8 bit sometimes 16 bit (UNICODE) depending on compiler options. Which makes coding tricky.
So, if your code is guaranteed to always be using UNICODE CString just go other.AsUCS2() in your == operator. You can also look at the class PWideString for more.
Robert Jongbloed
OPAL/OpenH323/PTLib Architect and Co-founder.
From: h323plus-bounces@lists.packetizer.com [mailto:h323plus-bounces@lists.packetizer.com] On Behalf Of ZAHRA dehghanianfard Sent: Thursday, 29 October 2009 9:00 PM To: h323plus Subject: [h323plus] please help us to convert PString object content to char * in VC++.
hi sir/modem Many thanks for your last regards, I have a problem about data conversion. i need to convert PString (a class exist in pstring.h inside ptlib package) object content to char * but How can i do this ? for more clearance i write the real code below:
inline bool operator==(const PString & other) const { return CString::Compare(other); } i need to convert other object content to wchar_t * but when run this code it have below error in VC++ 2005 .
error C2664: 'ATL::CStringT<BaseType,StringTraits>::Compare' : cannot convert parameter 1 from 'const PString' to 'const wchar_t *'
Please help me to solve this problem. I am in wait for your response. Best regards. Zahra.
_____
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participants (3)
-
Marcos Fábio Jardini -
Robert Jongbloed -
ZAHRA dehghanianfard