NmrClientAttachProvider function (netioddk.h)
The NmrClientAttachProvider function attaches a client module to a provider module.
Syntax
NTSTATUS NmrClientAttachProvider(
[in] HANDLE NmrBindingHandle,
[in] __drv_aliasesMem PVOID ClientBindingContext,
[in] const VOID *ClientDispatch,
[out] PVOID *ProviderBindingContext,
[out] const VOID **ProviderDispatch
);
Parameters
[in] NmrBindingHandle
A handle used by the NMR to represent the binding between the client module and the provider module. The NMR passes this handle to the client module when it calls the client module's ClientAttachProvider callback function.
[in] ClientBindingContext
A pointer to a caller-supplied context for the binding between the client module and the provider module. The client module uses this context to keep track of the state of the binding. The contents of the client module's binding context are opaque to the provider module. The provider module passes this pointer to the client module whenever it calls any of the client module's NPI callback functions that require the client module's binding context. The client module must make sure that this context remains valid and resident in memory as long as the provider module is attached to the client module.
[in] ClientDispatch
A pointer to a constant structure that contains the dispatch table of NPI callback functions for the client module. The client module must make sure that this structure remains valid and resident in memory as long as the provider module is attached to the client module. The contents of the structure are NPI-specific. If the NPI does not define a client dispatch table structure, the client module must set this parameter to NULL.
[out] ProviderBindingContext
A pointer to a variable that receives a pointer to the provider module's context for the binding between the client module and the provider module. The provider module uses this context to keep track of the state of the binding. The contents of the provider module's binding context are opaque to the client module. The client module passes this pointer to the provider module whenever it calls any of the provider module's NPI functions that require the provider module's binding context.
[out] ProviderDispatch
A pointer to a variable that receives a pointer to a structure that contains the dispatch table of
NPI functions for the provider
module. The contents of the structure are
NPI-specific.
Return value
The NmrClientAttachProvider function returns one of the following NTSTATUS codes:
| Return code | Description |
|---|---|
|
The client module was successfully attached to the provider module. |
|
The provider module did not attach to the client module. |
|
An error occurred. |
Remarks
A client module calls the NmrClientAttachProvider function from its ClientAttachProvider callback function to attach itself to a provider module.
When a client module calls the NmrClientAttachProvider function, the NMR calls the provider module's ProviderAttachClient callback function to complete the attachment process. The NmrClientAttachProvider function returns the status code that is returned by the provider module's ProviderAttachClient callback function.
If the NmrClientAttachProvider function does not return STATUS_SUCCESS, the client module should perform any necessary cleanup of the data contained within its binding context structure. The client module should then free the memory for its binding context structure if it dynamically allocated the memory for the structure.
If the NmrClientAttachProvider function returns STATUS_SUCCESS and the client module dynamically allocated the memory for its binding context, the client module should free that allocated memory when the NMR calls the client module's ClientCleanupBindingContext callback function after the client module and provider module are detached from each other.
If the NmrClientAttachProvider function returns STATUS_SUCCESS, the client module must save the pointers returned in the ProviderBindingContext and ProviderDispatch parameters so that it can call the provider module's NPI functions.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Windows Vista and later versions of the Windows operating systems. |
| Target Platform | Desktop |
| Header | netioddk.h (include Wsk.h) |
| Library | Netio.lib |
| IRQL | PASSIVE_LEVEL |