短信编码pdu格式解析（SMS encoding PDU format analysis）.docVIP

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短信编码pdu格式解析（SMS encoding PDU format analysis）.doc

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短信编码pdu格式解析（SMS encoding PDU format analysis） 2010-07-26 09:08:25 (PDU) Tags: a reprint First, the realization mode of short message receiving and sending Computer serial port to connect GSM MODEM, use it to send short messages to mobile phones, requiring the AT instruction set and serial programming more familiar. There are three modes for sending and receiving short messages: BLOCK mode, TEXT mode and PDU mode. Now the little BLOCK model; TEXT model can only send ASCII code, it can not send Chinese UNICODE codes -- specifically, can be technically used for sending Chinese Short Message, but the domestic mobile phone basically does not support; and the PDU pattern of development is more complex, it need to write special function to convert text to PDU format, but the PDU mode supported by all mobile phone, you can use any character set, it is also the default encoding mode of mobile phone. The author is in the development of the PDU model is selected. Two, PDU mode Using PDU mode to send and receive short messages, we can use three kinds of coding: 7-bit encoding, 8-bit encoding and UCS2 encoding. 7-bit Encoding is used to send ordinary ASCII characters; 8-bit encoding is usually used to send data messages, such as pictures or ringtones, etc.; UCS2 Encoding is used to send Unicode characters. Because the author wants to realize the sending of Chinese short message in the system, so choose to use UCS2 Encoding, that is Chinese Unicode code. (1) UCS2 coding principle The so-called UCS2 encoding, is a single character (1-2 bytes), according to the provisions of ISO/IEC10646, converted to 16 bits Unicode wide characters. A single character is converted to the number and word of the four bit 0 - 9, A - F A string consisting of a parent. Messages to be sent are sent in the form of UCS2 code. (two) the analysis of the transmission PDU string Through UCS2 coding, we get Chinese Unicode code, and then you can send PDU string preparation. From the table On the face of it, th