|
Overview |
|
|
|
Group |
|
|
|
Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| No
| Import Library
| kernel32.lib
| Header File
| winbase.h
| Unicode
| No
| Platform Notes
| None
|
|
|
SetupComm
The SetupComm function initializes the communications parameters for a specified
communications device.
BOOL SetupComm(
HANDLE hFile,
| // handle of communications device
| DWORD dwInQueue,
| // size of input buffer
| DWORD dwOutQueue
| // size of output buffer
| );
|
|
Parameters
hFile
Identifies the communications device. The CreateFile function returns this handle.
dwInQueue
Specifies the recommended size, in bytes, of the device's internal input
buffer.
dwOutQueue
Specifies the recommended size, in bytes, of the device's internal output
buffer.
Return Values
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error
information, call GetLastError.
Remarks
After a process uses the CreateFile function to open a handle to a communications device, it can call SetupComm to set the communications parameters for the device. If it does not set them,
the device uses the default parameters when the first call to another
communications function occurs.
The dwInQueue and dwOutQueue parameters specify the recommended sizes for the internal buffers used by the
driver for the specified device. For example, YMODEM protocol packets are
slightly larger than 1024 bytes. Therefore, a recommended buffer size might be 1200
bytes for YMODEM communications. For Ethernet-based communications, a
recommended buffer size might be 1600 bytes, which is slightly larger than a single
Ethernet frame.
The device driver receives the recommended buffer sizes, but is free to use
any input and output (I/O) buffering scheme, as long as it provides reasonable
performance and data is not lost due to overrun (except under extreme
circumstances). For example, the function can succeed even though the driver does not
allocate a buffer, as long as some other portion of the operating system provides
equivalent functionality.
If the device driver determines that the recommended buffer sizes involve
transfers beyond its ability to handle, the function can fail.
See Also
CreateFile, SetCommState
| Last news from Greatis Software |
 |
|
Nostalgia .Net |
|
.Net is powerful, but not all-powerful, so sometimes we need to use Win32 API for our .Net applications. It's simple enough with Platform Invoke if you have Win32 skill, but we do not always have time to dig the ancient documentation, declare the special types that are compatible with Win32, find the values of the Win32's constants and so on. Nostalgia .Net offers several simple-to-use classes, and components that will allow you to forget about the headache of Win32 and just use the power of Win32 in your application the same way as you use the native. Net classes. More » |
| Recommended software for developers |
 |
|
Ultimate Pack |
|
Component pack for Delphi and C++ Builder that contains runtime form designer, runtime object inspector, print suite and much more for the very special price. More » |
 |
|
Form Designer .Net |
|
Unique runtime form design solution that allows to edit any form in .Net WinForms application at runtime with full source codes for only 300 euro! More » |
 |
|
Print Suite .Net |
|
Print Suite .Net is a set of components for easy printing texts, images and grids from your WinForms applications. Full C# source codes are available More » |
 |
|
Gradient Controls .Net |
|
Gradient Controls .Net offers controls with gradient background feature. Labels, panels and so on... Full C# source codes are available More » |
 |
|
Greatis iGrid |
|
iGrid plots drawing grid right over your desktop, so you can use it everywhere, with any drawing application without any special plugins for different graphic editors. More » |
All the contacts and projectsDmitry Vasiliev (just.dmitry)
Related LinksSoftware for Visual Studio .NET developers
Software for Delphi and C++ Builder developers
Software for Visual Basic 6 developers
Delphi Tips&Tricks
MegaDetailed.NET More Online Helps Win32 Programmer's Reference
Win32 Multimedia Programmer's Reference
OLE Programmer's Reference
Microsoft Windows Pen API Programmer's Reference
Microsoft Windows Sockets 2 Reference
Microsoft Windows Telephony API (TAPI) Programmer's Reference
Unix Manual Pages
|
