| This thesis introduces the important function of Internet Short Message Gateway (ISMG) in wireless network short message services. ISMG provides a safe and quick way for the data exchange between Service Provider (SP) and Short Message Service Center (SMSC). So mobile phone users can intercommunicate with SP by short messages conveniently and receive the information services provided by SP.In this thesis, the dynamic linked library for short message gateway is developed and realized based on China Mobile Peer to Peer (CMPP2.0). It provides the universal programming interface under WINDOWS. And also SP application program, that is accessing short message gateway as client in order to receive and send short messages, is realized.The main work of this thesis is to envelop CMPP protocol and realize the interface of Internet Short Message Gateway. The program takes use of multiple threads so that message can be sent and received and link can be detected in each different threads. In order to improve the sending efficiency, thread pool is used in the sending thread. And based on CMPP protocol, sliding window is employed in the link connection to achieve both high efficiency of data transmission and credibility. API interface class is exported in the form of DLL to provide its member functions and variables for SP program. API based on CMPP is the bridge for the SP client to access the short message gateway.VC is employed in the program. Socket, packing and unpacking the Packed Data Unit (PDU) defined in CMPP and mutual request/answer are mainly involved here. There are three layers in the interface program. From bottom to top is that: Socket_IO layer, CMPP_PDU layer and API layer.The thesis uses ZhuoYue ISMG simulator to test the interface program.The system designed in the paper has been used in the subject for National WEST development—Han River Navigation Safety Information System, supported by the Ministry of Communications of China. |
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