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Can not send a SMS

Posted on 2003-11-24
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Last Modified: 2013-12-27
Hi All,

I have written an application which communicate with a GSM modem. I have problems to send 'CTRL+Z' to finish the sms text.

When I use the GSM-Modem testsoftware it works fine. I mean I can send a sms. My software works fine when I am using a Edit field to input the text and copy the text from the testsoftware to the Edit field. But it does not work when I input the data in the programme to send the text including 'CTRL+Z' to the modem.

'CTRL+Z' is a Windows keyboard shortcut for undo and this is exactly what my programme is doing. For example it copies some text to it but do not send the 'CTRL+Z'.

I tried quite a lot to solve the problem. I have sent the hex code such as (1A='CRTL+Z')
ComPort->WriteString("\0x35\0x31\0x2E\0x31\0x32\0x33\0x34\0x45\0x36\0x3B\0x2D\0x33\0x2E\0x31\0x32\0x33\0x34\0x35\0x36\0x1A\0x20\0x20\0x0d");
It does not work.

When I use the testsoftware it sends a sms with the following text: '> Test-SMS  '. '' seems to be 'CTRL+Z'. I have written my programme with the Borland C++ Builder 6 and it does not compile '' with the error message 'Unterminated string or character constant
'.

Is there anybody who had similar problems and can help me?

Cheers,
Ronald
 
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Question by:rsch1973
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Accepted Solution

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SimonTay earned 500 total points
ID: 9989775
Make sure you do NOT send a CR (0x0d) after the CTRL-Z, and make sure your program waits for the > prompt after sending the initial AT+CGMS command.

Most people send the second line too quickly causing the problem.

Simon
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