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Computrainer code to open COM ports above 9 on Windows

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The docs for CreateFile indicate that to open a comm port above
COM9 you must use a filespec of "\\.\COMX". The original code
did not apply this rule and failed to open ports above COM9 as a
result. This is especially important since it is quite common for
the USB->Serial converters to assign an assignable comm port number.
This commit is contained in:
Mark Liversedge
2009-12-19 13:01:19 +00:00
committed by Sean Rhea
parent d1d2037883
commit 1a96535708
1 changed files with 10 additions and 2 deletions
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12
src/Computrainer.cpp
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@@ -842,8 +842,16 @@ int Computrainer::openPort()
COMMTIMEOUTS timeouts; // timeout settings on serial ports
wchar_t deviceFilenameW[32]; // COM1 needs 4 characters, 32 should be enough?
MultiByteToWideChar(CP_ACP, 0, deviceFilename.toAscii(), -1, (LPWSTR)deviceFilenameW,
// if deviceFilename references a port above COM9
// then we need to open "\\.\COMX" not "COMX"
QString portSpec;
int portnum = deviceFilename.midRef(3).toString().toInt();
if (portnum < 10)
portSpec = deviceFilename;
else
portSpec = "\\\\.\\" + deviceFilename;
wchar_t deviceFilenameW[32]; // \\.\COM32 needs 9 characters, 32 should be enough?
MultiByteToWideChar(CP_ACP, 0, portSpec.toAscii(), -1, (LPWSTR)deviceFilenameW,
sizeof(deviceFilenameW));
// win32 commport API