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<DIV class="left fontsize2">深入浅出VC++串口编程之短信应用开发</DIV>
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<DIV class=left><SPAN class=span>作者:宋宝华</SPAN><SPAN
class=span>出处:天极开发</SPAN><SPAN class=span>责任编辑:<A title=向本编辑提问
href="http://comments.yesky.com/t/·½ÖÛ/6,324/2310399.shtml"> 方舟 </A></SPAN><SPAN
class=span>[ 2006-02-21 13:56 ]</SPAN></DIV>
<DIV class=fontclear></DIV>
<DIV class="left fontsize3">本章将给出一个典型的应用实例:西门子短信服务模块TC35的串口控制。</DIV>
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<DIV class=guanggao><SPAN
id=contentAdv></SPAN></DIV> 下面是对本例程软件的主要数据结构和核心函数的介绍:<BR><BR> 数据结构<BR><BR>
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<TD>// 用户信息编码方式<BR>#define GSM_7BIT 0<BR>#define GSM_8BIT 4<BR>#define
GSM_UCS2 8 <BR>// 短消息参数结构,编码/解码共用<BR>// 其中,字符串以0结尾<BR>typedef
struct<BR>{<BR> char SCA[16]; // 短消息服务中心号码(SMSC地址)<BR> char TPA[16]; //
目标号码或回复号码(TP-DA或TP-RA)<BR> char TP_PID; // 用户信息协议标识(TP-PID)<BR> char
TP_DCS; // 用户信息编码方式(TP-DCS)<BR> char TP_SCTS[16]; // 服务时间戳字符串(TP_SCTS),
接收时用到<BR> char TP_UD[161]; // 原始用户信息(编码前或解码后的TP-UD)<BR> char index; //
短消息序号,在读取时用到<BR>}
SM_PARAM;</TD></TR></TBODY></TABLE><BR> <B>发送短消息</B><BR><BR> 发送按钮对应的函数为CSMSControlDlg::OnSendButton,它读取用户输出并根据目标电话号码和短信息内容形成SM_PARAM(源PDU参数)的内容,接着进行发送:<BR><BR>
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<TD>void CSMSControlDlg::OnSendButton() <BR>{<BR> // TODO: Add your
control notification handler code here<BR> //获得用户输入<BR> CString
desPhoneNum;<BR> CString
smsContent;<BR> GetDlgItemText(IDC_PHONENUM_EDIT,desPhoneNum);<BR> GetDlgItemText(IDC_SMSCONTENT_EDIT,smsContent);<BR><BR> //填充SM_PARAM结构体内容<BR> SM_PARAM
smParam;<BR> smParam =
CreateSMPARAMStruct(desPhoneNum,smsContent);<BR><BR> //发送短信息<BR> gsmSendMessage(smParam);<BR>}</TD></TR></TBODY></TABLE><BR> 其中调用的gsmSendMessage函数体现了串口通信的核心内容,它按照第1节阐述的GSM模块发送短消息的串口控制流程进行短信的发送:<BR><BR>
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<TD>BOOL gsmSendMessage(const SM_PARAM *pSrc // pSrc:
源PDU参数指针)<BR>{<BR> int nPduLength; // PDU串长度<BR> unsigned char
nSmscLength; // SMSC串长度<BR> int nLength; // 串口收到的数据长度<BR> char cmd[16]; //
命令串<BR> char pdu[512]; //
PDU串<BR> char
ans[128]; // 应答串<BR><BR> nPduLength = gsmEncodePdu(pSrc, pdu); //
根据PDU参数,编码PDU串<BR> strcat(pdu, "\x01a"); //
以Ctrl-Z结束<BR><BR> gsmString2Bytes(pdu, &nSmscLength, 2); //
取PDU串中的SMSC信息长度<BR> nSmscLength++; // 加上长度字节本身<BR><BR> //
命令中的长度,不包括SMSC信息长度,以数据字节计<BR> sprintf(cmd, "AT+CMGS=%d\r", nPduLength /
2-nSmscLength); // 生成命令<BR><BR> WriteComm(cmd, strlen(cmd)); //
先输出命令串<BR><BR> nLength = ReadComm(ans, 128); // 读应答数据<BR> <BR> //
根据能否找到"\r\n> "决定成功与否<BR> if (nLength == 4 && strncmp(ans,
"\r\n> ", 4) == 0)<BR> {<BR> WriteComm(pdu, strlen(pdu)); //
得到肯定回答,继续输出PDU串<BR><BR> nLength = ReadComm(ans, 128); //
读应答数据<BR> <BR> //
根据能否找到"+CMS ERROR"决定成功与否<BR> if (nLength > 0 && strncmp(ans,
"+CMS ERROR", 10) != 0)<BR> {<BR> return TRUE;<BR> }<BR> }<BR> return
FALSE;<BR>}<BR></TD></TR></TBODY></TABLE><BR> <B>读取短消息<BR></B><BR> 点击"接收"按钮会通过gsmReadMessage函数的调用获得所有短消息,最后在列表控件中显示所有短信:<BR><BR>
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<TD>void CSMSControlDlg::OnRecvButton() <BR>{<BR> // TODO: Add your
control notification handler code here<BR> SM_PARAM
smParam[100];//短信缓冲区<BR> int smsNum;//短信条数<BR> smsNum =
gsmReadMessage(smParam);//读取短信<BR><BR> //显示短信<BR> for(int
i=0;i<smsNum;i++)<BR> {<BR> m_recvlist.AddString(CString(smsNum[i].TPA)+smsNum[i].TP_UD);<BR> }
<BR>}</TD></TR></TBODY></TABLE><BR><BR> 其中调用的gsmReadMessage函数完成最核心的短信接收功能,它按照第1节阐述的GSM模块接收短消息的串口控制流程进行短信的接收:<BR><BR>
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<TD><BR>// 参数:pMsg 短消息缓冲区,必须足够大<BR>// 返回:短消息条数<BR>int
gsmReadMessage(SM_PARAM* pMsg)<BR>{<BR> int nLength; // 串口收到的数据长度<BR> int
nMsg; // 短消息计数值<BR> char* ptr; // 内部用的数据指针<BR> char cmd[16]; //
命令串<BR> char ans[1024]; // 应答串<BR><BR> nMsg = 0;<BR> ptr =
ans;<BR><BR> sprintf(cmd, "AT+CMGL\r"); //
生成命令,用+CMGL可一次性读出全部短消息<BR> <BR> WriteComm(cmd,
strlen(cmd)); // 输出命令串<BR> nLength = ReadComm(ans, 1024); // 读应答数据<BR> //
根据能否找到"+CMS ERROR"决定成功与否<BR> if(nLength > 0 && strncmp(ans,
"+CMS ERROR", 10) != 0)<BR> {<BR> // 循环读取每一条短消息,
以"+CMGL:"开头<BR> while((ptr = strstr(ptr, "+CMGL:")) !=
NULL)<BR> {<BR> ptr += 6; // 跳过"+CMGL:"<BR> sscanf(ptr, "%d",
&pMsg->index); // 读取序号<BR> <BR> ptr =
strstr(ptr, "\r\n"); // 找下一行<BR> ptr += 2; //
跳过"\r\n"<BR><BR> gsmDecodePdu(ptr, pMsg); // PDU串解码<BR> pMsg++; //
准备读下一条短消息<BR> nMsg++; // 短消息计数加1<BR> }<BR> }<BR> return
nMsg;<BR>}<BR><BR></TD></TR></TBODY></TABLE><BR>
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