The Windows CE 5.0: Standard SDK, in conjunction with the Microsoft eMbedded Visual C 4.0 SP4, deliver a complete development environment for creating applications for devices based on Microsoft® Windows® CE 5.0. Aug 27, 2004 The Device Emulator contains the emulator technologies featured in Windows CE 5.0. By using the Device Emulator, you can run emulated-based images created by Windows CE 5.0 without installing Platform Builder, its platform development tool.
This function provides a generic I/O control code (IOCTL) for OEM-supplied information.
dwIoControlCode
[in] IOCTL, which can be pre-defined, or any OEM-defined control code. For more information, see OAL IOCTLs.
lpInBuf
[out] Pointer to the input buffer that can contain additional information associated with the dwIoControlCode parameter.
For example, when the dwIoControlCode parameter has the value IOCTL_HAL_GET_DEVICE_INFO, the lpInBuf parameter contains one of the SPI_* codes in the following table.
| Value | Description |
|---|---|
| SPI_GETPLATFORMTYPE | String specifying the type of Windows CE device. |
| SPI_GETOEMINFO | String specifying OEM information that distinguishes this specific device from others of the same type. |
nInBufSize
[in] Size in bytes of lpInBuf.
For example, when dwIoControlCode is set to IOCTL_HAL_GET_DEVICE_INFO and the input buffer contains the SPI code, nInBufsize is set to the value 4.
lpOutBuf
[out] Pointer to the output buffer supplied by the caller.
Your implementation should place the information requested by the dwIoControlCode and lpInBuf parameters into lpOutBuf, set lpBytesReturned to indicate the size of the data in lpOutbuf, and return TRUE*.*
If the size of the requested information exceeds the buffer size specified by nOutBufSize, call the function SetLastError using the ERROR_INSUFFICIENT_BUFFER flag and return FALSE.
nOutBufSize
[in] Specifies the maximum number of bytes that can be returned in lpOutBuf.
The caller sets this value.
lpBytesReturned
[in] Number of bytes returned in lpOutBuf.
If this function succeeds, it returns TRUE.
If this function fails, it returns FALSE.
This function is the means of returning system information requested by the SystemParametersInfo function. This function must be implemented. When a device driver or routine calls the KernelIoControl kernel routine to pass an IOCTL, the kernel calls OEMIoControl.
The system can be pre-empted when this function is called. The kernel does no processing but passes all parameters directly to this function. The kernel function is provided to allow an OEM device driver to communicate with kernel mode OAL code.
From within this function, you can make Windows CE API calls.
A sample implementation is provided in the Oemioctl.c file.
When adding custom IOCTLs handled by OEMIoControl, the last identifier used is equal to 67 for kernel IOCTLs based on FILE_DEVICE_HAL.
Function codes 0 through 2047 are reserved for Microsoft; codes 2048 through 4095 are reserved for customers.
Currently, internal product teams and external customers are using values in the range of 1000 through 1100.
OS Versions: Windows CE 2.10 and later.
Header: Kwin32.h.
Link Library: Nk.lib.
KernelIoControl OEMSetRealTime SetKernelCommDev SystemParametersInfo Implementing the OEMIoControl Function
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-->This function specifies an event object to be associated with the supplied set of FD_XXX network events.
The return value is zero if the application's specification of the network events and the associated event object was successful. If an error occurs, the value SOCKET_ERROR is returned, and a specific error number can be retrieved by calling the WSAGetLastError function.
As in the case of the select function, WSAEventSelect will frequently be used to determine when a data transfer operation (send or receive) can be issued with the expectation of immediate success. Nevertheless, a robust application must be prepared for the possibility that the event object is set and it issues a Windows Sockets call that returns WSAEWOULDBLOCK immediately. For example, the following sequence of operations is possible:
The occurrence of the network event is recorded, the corresponding bit is set in the internal network event record, and the associated event object is signalled. No further action is taken for the network event until the application makes the function call that implicitly re-enables the setting of the event and signals the associated event object.
| Network event | Re-enabling function |
|---|---|
| FD_READ | recv, recvfrom, WSARecv, or WSARecvFrom. |
| FD_WRITE | send, sendto, WSASend, or WSASendTo. |
| FD_OOB | recv, recvfrom, WSARecv, or WSARecvFrom. |
| FD_ACCEPT | accept (Windows Sockets) or WSAAccept unless the error code returned is WSATRY_AGAIN indicating that the condition function returned CF_DEFER. |
| FD_CONNECT | None. |
| FD_CLOSE | None. |
| FD_ROUTING_ INTERFACE_CHANGE | WSAIoctl with command SIO_ROUTING_INTERFACE_CHANGE. |
| FD_ADDRESS_ LIST_CHANGE | WSAIoctl with command SIO_ADDRESS_LIST_CHANGE. |
Any call to the re-enabling routine, even one that fails, results in re-enabling of recording and signaling for the relevant network event and event object.
For FD_READ, FD_OOB, and FD_ACCEPT network events, network event recording and event object signaling are level-triggered. This means that if the re-enabling routine is called and the relevant network condition is still valid after the call, the network event is recorded and the associated event object is set. This allows an application to be event-driven and not be concerned with the amount of data that arrives at any one time. Consider the following sequence:
With these semantics, an application need not read all available data in response to an FD_READ network event — a single recv in response to each FD_READ network event is appropriate.
The FD_ROUTING_INTERFACE_CHANGE and FD_ADDRESS_LIST_CHANGE events are considered edge-triggered as well. A message will be posted exactly once when a change occurs after the application has requested the notification by issuing WSAIoctl with SIO_ROUTING_INTERFACE_CHANGE or SIO_ADDRESS_LIST_CHANGE correspondingly. Other messages will not be forthcoming until the application re-issues the IOCTL and another change is detected since the IOCTL has been issued.
If a network event has already happened when the application calls WSAEventSelect or when the re-enabling function is called, a network event is recorded and the associated event object is set as appropriate. For example, consider the following sequence:
The FD_WRITE network event is handled slightly differently. An FD_WRITE network event is recorded when a socket is first connected with connect/WSAConnect or accepted with accept/WSAAccept, and then after a send fails with WSAEWOULDBLOCK and buffer space becomes available. Therefore, an application can assume that sends are possible starting from the first FD_WRITE network event setting and lasting until a send returns WSAEWOULDBLOCK. After such a failure, the application will find out that sends are again possible when an FD_WRITE network event is recorded and the associated event object is set.
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The FD_OOB network event is used only when a socket is configured to receive out of band (OOB) data separately. If the socket is configured to receive OOB data inline, the OOB (expedited) data is treated as usual data and the application should register an interest in, and will get an FD_READ network event, not an FD_OOB network event. An application can set or inspect the way in which OOB data is to be handled by using setsockopt (Windows Sockets) or getsockopt (Windows Sockets) for the SO_OOBINLINE option.
The error code in an FD_CLOSE network event indicates whether the socket close was graceful or abortive. If the error code is zero, then the close was graceful; if the error code is WSAECONNRESET, then the socket's virtual circuit was reset. Game san andreas. This only applies to connection-oriented sockets such as SOCK_STREAM.
The FD_CLOSE network event is recorded when a close indication is received for the virtual circuit corresponding to the socket. In TCP terms, this means that the FD_CLOSE is recorded when the connection goes into the TIME WAIT or CLOSE WAIT states. This results from the remote end performing a shutdown on the send side or a closesocket. The FD_CLOSE network event is posted after all data is read from a socket. An application should check for remaining data on receipt of FD_CLOSE to avoid any possibility of losing data.
Windows Sockets will record only an FD_CLOSE network event to indicate closure of a virtual circuit. It will not record an FD_READ network event to indicate this condition.
The FD_ROUTING_INTERFACE_CHANGE network event is recorded when the local interface that should be used to reach the destination specified in WSAIoctl with SIO_ROUTING_INTERFACE_CHANGE changes after such IOCTL has been issued.
The FD_ADDRESS_LIST_CHANGE network event is recorded when the list of addresses of the protocol family for the socket to which the application can bind changes after WSAIoctl with SIO_ADDRESS_LIST_CHANGE has been issued.
The following table shows a list of possible error codes.
| Error code | Description |
|---|---|
| WSANOTINITIALISED | A successful WSAStartup call must occur before using this function. |
| WSAENETDOWN | The network subsystem has failed. |
| WSAEINVAL | One of the specified parameters was invalid, or the specified socket is in an invalid state. |
| WSAEINPROGRESS | A blocking Winsock call is in progress, or the service provider is still processing a callback function. |
| WSAENOTSOCK | The descriptor is not a socket. |
This function is used to specify an event object, hEventObject, to be associated with the selected FD_XXX network events, lNetworkEvents. The socket for which an event object is specified is identified by the parameter s. The event object is set when any of the nominated network events occur.
This function sets the associated event object and records the occurrence of this event in an internal network event record. An application can use WSAEnumNetworkEvents to retrieve the contents of the internal network event record and thus determine which of the nominated network events have occurred.
WSAEventSelect is the only function that causes network activity and errors to be recorded and retrievable through WSAEnumNetworkEvents. See the description of select to find out how that function reports network activity and errors.
The WSAEventSelect function automatically sets socket s to nonblocking mode, regardless of the value of lNetworkEvents. See ioctlsocket and WSAIoctl for how to set the socket back to blocking mode.
The lNetworkEvents parameter is constructed by using the bitwise OR operator with any of the values specified in the following table.
| Value | Description |
|---|---|
| FD_READ | Wants to receive notification of readiness for reading. |
| FD_WRITE | Wants to receive notification of readiness for writing. |
| FD_OOB | Wants to receive notification of the arrival of out of band (OOB) data. |
| FD_ACCEPT | Wants to receive notification of incoming connections. |
| FD_CONNECT | Wants to receive notification of a completed connection or multipoint join operation. |
| FD_CLOSE | Wants to receive notification of a socket closure. |
| FD_ROUTING_ INTERFACE_CHANGE | Wants to receive notification of routing interface changes for the specified destination. |
| FD_ADDRESS_ LIST_CHANGE | Wants to receive notification of local address list changes for the address family of the socket. |
Issuing a WSAEventSelect call for a socket cancels any previous WSAEventSelect calls for the same socket and clears the internal network event record. For example, to associate an event object with both reading and writing network events, the application must call WSAEventSelect with both FD_READ and FD_WRITE as the following code sample shows.
It is not possible to specify different event objects for different network events. The following code will not work because the second call will cancel the effects of the first, and only the FD_WRITE network event will be associated with hEventObject2.
To cancel the association and selection of network events on a socket, lNetworkEvents should be set to zero, in which case the hEventObject parameter will be ignored.
Closing a socket with the closesocket function also cancels the association and selection of network events specified in WSAEventSelect for the socket. The application, however, still must call WSACloseEvent to explicitly close the event object and free any resources.
The socket created when the accept function is called has the same properties as the listening socket used to accept it. Any WSAEventSelect association and network events selection set for the listening socket apply to the accepted socket. For example, if a listening socket has a WSAEventSelect association of hEventOject with FD_ACCEPT, FD_READ, and FD_WRITE, then any socket accepted on that listening socket will also have FD_ACCEPT, FD_READ, and FD_WRITE network events associated with the same hEventObject. If a different hEventObject or network event is desired, the application should call WSAEventSelect, passing the accepted socket and the desired new information.
OS Versions: Windows CE .NET 4.0 and later.
Header: Winsock2.h.
Link Library: Ws2.lib.
accept (Windows Sockets) closesocket getsockopt (Windows Sockets) ioctlsocket listen recv recvfrom select send sendto setsockopt (Windows Sockets) shutdown WSAAccept WSACloseEvent WSACreateEvent WSAEnumNetworkEvents WSAGetLastError WSAIoctl WSARecv WSARecvFrom WSASend WSASendTo WSAStartup
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