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Anonymous users2024-02-07hcomm=createfile(port, generic_read and generic_write,0, null, open_existing,file_attribute_normal and file_flag_overlapped,null);
hcomm is the handle of the serial port, and the port can be set directly"com1"Or com2, etc.
For other parameters, please refer to the MSDN description.
The usage of writefile() is the same.
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Anonymous users2024-02-06Both synchronous serial ports and asynchronous serial ports are the embodiment of the RS232C mode, and the main difference is in their transmission methods: asynchronous transmission refers to the transmission of one character (5 8 bits) of data at a time. Each character is led by a Wei start bit and ended with a stop bit.
This allows the receiver to analyze the sender's data. However, timing drift is susceptible. Synchronous transmission, on the other hand, uses character-oriented or bit-oriented insertion to control the start of a frame to be transmitted.
This is the difference between synchronous and asynchronous transmission, and it is also the difference between synchronous serial and asynchronous serial ports. The same is true for synchronous and asynchronous packet transmission.
All of the differences are made so that the receiver can read the data sent by the sender.
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Anonymous users2024-02-051. Open the serial port.
In the article "VC Open Serial Port", we have separately introduced the method of using API to open a serial port, and the serial port is opened or created by using the API function createfile. The prototype of this function is:
handle createfile( lpctstr lpfilename,dword dwdesiredaccess,dword dwsharemode,lpsecurity_attributes lpsecurityattributes,dword dwcreationdistribution,dword dwflagsandattributes,handle htemplatefile);
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Anonymous users2024-02-04Haha, it's simple and it makes no difference at the application layer. It's just that the level standard at the bottom is different, and the wiring party is different. This distinction is transparent to the procedural cheating.
In other words, just use it.
If the interface is configurable, at most select it from the driver or from the hardware DIP switch.
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Anonymous users2024-02-03Search on the Internet, C++ uses API to do serial port programming is much wider, and other languages are estimated to be difficult to use API, at least it is more troublesome to receive information and process Mu Liang.
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Anonymous users2024-02-02Regarding the problem that the cout output is garbled, it may be that you are receiving numerical data, not character data, if so, you need to take this into account.
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There is a corresponding ** on the Internet, you can check it yourself!
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