C++ wxOutputStream::GetLastError方法代码示例

/*!
 This function is called for every value objects of INT type.
 This function uses the \n snprintf function to get the US-ASCII
 representation of the integer and simply copy it to the output stream.
 Returns -1 on stream errors or ZERO if no errors.
*/
int
wxJSONWriter::WriteIntValue( wxOutputStream& os, const wxJSONValue& value )
{
    int r = 0;
    char buffer[32];        // need to store 64-bits integers (max 20 digits)
    size_t len;

    wxJSONRefData* data = value.GetRefData();
    wxASSERT( data );

#if defined( wxJSON_64BIT_INT )

        // this is for wxW 2.8 Unicode: in order to use the cross-platform
        // format specifier, we use the wxString's sprintf() function and then
        // convert to UTF-8 before writing to the stream
        wxString s;
        s.Printf( _T("%") wxLongLongFmtSpec _T("d"),
                                                data->m_value.m_valInt64 );
        wxCharBuffer cb = s.ToUTF8();
        const char* cbData = cb.data();
        len = strlen( cbData );
        wxASSERT( len < 32 );
        memcpy( buffer, cbData, len );
        buffer[len] = 0;
    
#else
    snprintf( buffer, 32, "%ld", data->m_value.m_valLong );
#endif
    len = strlen( buffer );
    os.Write( buffer, len );
    if ( os.GetLastError() != wxSTREAM_NO_ERROR )    {
        r = -1;
    }
    return r;
}

/*!
 The function writes the \b null literal string to the output stream.
*/
int
wxJSONWriter::WriteNullValue( wxOutputStream& os )
{
    os.Write( "null", 4 );
    if ( os.GetLastError() != wxSTREAM_NO_ERROR )    {
        return -1;
    }
    return 0;
}

/*!
 This function is called for every value objects of DOUBLE type.
 This function uses the \n snprintf function to get the US-ASCII
 representation of the integer and simply copy it to the output stream.
 Returns -1 on stream errors or ZERO if no errors.

 Note that writing a double to a decimal ASCII representation could
 lay to unexpected results depending on the format string used in the
 conversion.
 See SetDoubleFmtString for details.
*/
int
wxJSONWriter::WriteDoubleValue( wxOutputStream& os, const wxJSONValue& value )
{
    int r = 0;

    char buffer[32];
    wxJSONRefData* data = value.GetRefData();
    wxASSERT( data );
    snprintf( buffer, 32, m_fmt, data->m_value.m_valDouble );
    size_t len = strlen( buffer );
    os.Write( buffer, len );
    if ( os.GetLastError() != wxSTREAM_NO_ERROR )    {
        r = -1;
    }
    return r;
}

/*!
 This function is called for every value objects of UINT type.
 This function uses the \n snprintf function to get the US-ASCII
 representation of the integer and simply copy it to the output stream.
 The function prepends a \b plus \b sign if the \c wxJSONWRITER_RECOGNIZE_UNSIGNED
 flag is set in the \c m_flags data member.
 Returns -1 on stream errors or ZERO if no errors.
*/
int
wxJSONWriter::WriteUIntValue( wxOutputStream& os, const wxJSONValue& value )
{
    int r = 0; size_t len;

    // prepend a plus sign if the style specifies that unsigned integers
    // have to be recognized by the JSON reader
    if ( m_style & wxJSONWRITER_RECOGNIZE_UNSIGNED )  {
        os.PutC( '+' );
    }

    char buffer[32];        // need to store 64-bits integers (max 20 digits)
    wxJSONRefData* data = value.GetRefData();
    wxASSERT( data );

#if defined( wxJSON_64BIT_INT )
    #if wxCHECK_VERSION(2, 9, 0 ) || !defined( wxJSON_USE_UNICODE )
        // this is fine for wxW 2.9 and for wxW 2.8 ANSI
        snprintf( buffer, 32, "%" wxLongLongFmtSpec "u",
                data->m_value.m_valUInt64 );
    #elif wxCHECK_VERSION(3, 0, 0) || !defined( wxJSON_USE_UNICODE )
        snprintf( buffer, 32, "%" wxLongLongFmtSpec "u",
             data->m_value.m_valUInt64 );
    #else
        // this is for wxW 2.8 Unicode: in order to use the cross-platform
        // format specifier, we use the wxString's sprintf() function and then
        // convert to UTF-8 before writing to the stream
        wxString s;
        s.Printf( _T("%") wxLongLongFmtSpec _T("u"),
                data->m_value.m_valInt64 );
        wxCharBuffer cb = s.ToUTF8();
        const char* cbData = cb.data();
        len = strlen( cbData );
        wxASSERT( len < 32 );
        memcpy( buffer, cbData, len );
        buffer[len] = 0;
    #endif
#else
    snprintf( buffer, 32, "%lu", data->m_value.m_valULong );
#endif
    len = strlen( buffer );
    os.Write( buffer, len );
    if ( os.GetLastError() != wxSTREAM_NO_ERROR )    {
        r = -1;
    }
    return r;
}

/*!
 This function is called for every value objects of DOUBLE type.
 This function uses the \n snprintf function to get the US-ASCII
 representation of the integer and simply copy it to the output stream.
 Returns -1 on stream errors or ZERO if no errors.

 Note that writing a double to a decimal ASCII representation could
 lay to unexpected results depending on the format string used in the
 conversion.
 See SetDoubleFmtString for details.
*/
int
wxJSONWriter::WriteDoubleValue( wxOutputStream& os, const wxJSONValue& value )
{
    int r = 0;

    wxJSONRefData* data = value.GetRefData();
    wxASSERT( data );

    char* writeBuff = 0;
    // the buffer that has to be written is either UTF-8 or ANSI c_str() depending
    // on the 'm_noUtf8' flag
    wxCharBuffer utf8CB = wxString::FromCDouble(data->m_value.m_valDouble, 10).ToUTF8();        // the UTF-8 buffer
#if !defined(wxJSON_USE_UNICODE)
    wxCharBuffer ansiCB(str.c_str());        // the ANSI buffer    
    if (m_noUtf8)    
    {
        writeBuff = ansiCB.data();
    }
    else    
    {
        writeBuff = utf8CB.data();
    }
   #else
       writeBuff = utf8CB.data();
   #endif
        
    // NOTE: in ANSI builds UTF-8 conversion may fail (see samples/test5.cpp,
    // test 7.3) although I do not know why
    if (writeBuff == 0)    
    {
        const char* err = "<wxJSONWriter::WriteComment(): error converting the double to UTF-8>";
        os.Write(err, strlen(err));
        return 0;
    }
    size_t len = strlen(writeBuff);
    
    os.Write(writeBuff, len);
    if (os.GetLastError() != wxSTREAM_NO_ERROR)    
    {
        r = -1;
    }
    return r;
}

/*!
 The function writes the wxString object \c str to the output object.
 The string is written as is; you cannot use it to write JSON strings
 to the output text.
 The function converts the string \c str to UTF-8 and writes the buffer..
*/
int
wxJSONWriter::WriteString( wxOutputStream& os, const wxString& str )
{
    wxLogTrace( writerTraceMask, _T("(%s) string to write=%s"),
                  __PRETTY_FUNCTION__, str.c_str() );
    int lastChar = 0;
    char* writeBuff = 0;

    // the buffer that has to be written is either UTF-8 or ANSI c_str() depending
    // on the 'm_noUtf8' flag
    wxCharBuffer utf8CB = str.ToUTF8();        // the UTF-8 buffer
#if !defined( wxJSON_USE_UNICODE )
    wxCharBuffer ansiCB( str.c_str());        // the ANSI buffer

    if ( m_noUtf8 )    {
        writeBuff = ansiCB.data();
    }
    else    {
        writeBuff = utf8CB.data();
    }
#else
    writeBuff = utf8CB.data();
#endif

    // NOTE: in ANSI builds UTF-8 conversion may fail (see samples/test5.cpp,
    // test 7.3) although I do not know why
    if ( writeBuff == 0 )    {
        const char* err = "<wxJSONWriter::WriteComment(): error converting the string to UTF-8>";
        os.Write( err, strlen( err ));
        return 0;
    }
    size_t len = strlen( writeBuff );

    os.Write( writeBuff, len );
    if ( os.GetLastError() != wxSTREAM_NO_ERROR )    {
        return -1;
    }

    wxLogTrace( writerTraceMask, _T("(%s) result=%d"),
                  __PRETTY_FUNCTION__, lastChar );
    return lastChar;
}

/*!
 The function is called by WriteIndent() and other writer's functions.
 It writes the indentation as specified in the \c num parameter which is
 the actual \b level of annidation.
 The function checks if wxJSONWRITER_STYLED is set: if not, no indentation
 is performed.
 Also, the function checks if wxJSONWRITER_TAB_INDENT is set: if it is,
 indentation is done by writing \b num TAB characters otherwise,
 it is performed by writing a number of spaces computed as:
 \code
  numSpaces = m_indent + ( m_step * num )
 \endcode

*/
int
wxJSONWriter::WriteIndent( wxOutputStream& os, int num )
{
    int lastChar = 0;
    if ( !(m_style & wxJSONWRITER_STYLED) || (m_style & wxJSONWRITER_NO_INDENTATION))  {
        return lastChar;
    }

    int numChars = m_indent + ( m_step * num );
    char c = ' ';
    if ( m_style & wxJSONWRITER_TAB_INDENT ) {
        c = '\t';
        numChars = num;
    }

    for ( int i = 0; i < numChars; i++ )  {
        os.PutC( c );
        if ( os.GetLastError() != wxSTREAM_NO_ERROR )    {
            return -1;
        }

    }
    return c;
}