Windows API - Win32
A core set of Windows application programming interfaces (APIs) for desktop and server applications. Previously known as Win32 API.
2,523 questions
Open bluetooth COM with CreateFile. Super slow!
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(256, 49%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ELX%3C/text%3E%3C/svg%3E)
Lucky Xia
0
Reputation points
OS INFO: WIN10, WIN11;
Open bluetooth COM (Some Bluetooth headphones/mouse create these COMs)with CreateFile. Super slow!
But USB COM or native COM is fast.
APP INFO: Unicode, 32bits;
Code Info:
HANDLE hPort = ::CreateFile(Str::Fmt(_T("\\\\.\\COM%d"), idx),
GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, NULL, NULL);
{count} votes
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(179.20000000000002, 34%, 27%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EXY%3C/text%3E%3C/svg%3E)
Xiaopo Yang - MSFT 12,231 Reputation points Microsoft Vendor2023-07-28T01:18:36.4266667+00:00 Not sure there is any issues.
You can open an incident at link below so that our engineer can work with you closely: https://developer.microsoft.com/en-us/windows/support/?tabs=Contact-us and please choose the 'System Services Development - File and storage APIs' for Windows SDK for this issue. In-addition, if the support engineer determines that the issue is the result of a bug the service request will be a no-charge case and you won't be charged.
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