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GetMailslotInfo info  Overview  Group

The GetMailslotInfo function retrieves information about the specified mailslot.

BOOL GetMailslotInfo(

    HANDLE hMailslot,

// mailslot handle

    LPDWORD lpMaxMessageSize,

// address of maximum message size

    LPDWORD lpNextSize,

// address of size of next message

    LPDWORD lpMessageCount,

// address of number of messages

    LPDWORD lpReadTimeout 

// address of read time-out

   );

Parameters

hMailslot
Identifies a mailslot. The CreateMailslot function must create this handle.
lpMaxMessageSize
Points to a buffer specifying the maximum message size, in bytes, allowed for this mailslot, when the function returns. This value can be greater than or equal to the value specified in the cbMaxMsg parameter of the CreateMailslot function that created the mailslot. This parameter can be NULL.
lpNextSize
Points to a buffer specifying the size, in bytes, of the next message, when the function returns. The following value has special meaning:

Value

Meaning

MAILSLOT_NO_MESSAGE

There is no next message.

This parameter can be NULL.

lpMessageCount
Points to a buffer specifying the total number of messages waiting to be read, when the function returns. This parameter can be NULL.
lpReadTimeout
Points to a buffer specifying the amount of time, in milliseconds, a read operation can wait for a message to be written to the mailslot before a time-out occurs. This parameter is filled in when the function returns. This parameter can be NULL.

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.

See Also

CreateMailslot, SetMailslotInfo

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