An event type. See the Remarks section for a description of the available values
dwData
The address of a structure that contains event-specific data. Its meaning depends on the given event.
Remarks
The framework calls this member function to notify an application or device driver of a change to the hardware configuration of a device or the computer.
For devices that offer software-controllable features, such as ejection and locking, the operating system typically sends a DBT_DEVICEREMOVEPENDING message to let applications and device drivers end their use of the device gracefully.
If the operating system forcefully removes of a device, it may not send a DBT_DEVICEQUERYREMOVE message before doing so.
The nEvent parameter can be one of these values:
DBT_DEVICEARRIVAL A device has been inserted and is now available.
DBT_DEVICEQUERYREMOVE Permission to remove a device is requested. Any application can deny this request and cancel the removal.
DBT_DEVICEQUERYREMOVEFAILED Request to remove a device has been canceled.
DBT_DEVICEREMOVEPENDING Device is about to be removed. Cannot be denied.
DBT_DEVICEREMOVECOMPLETE Device has been removed.
DBT_DEVICETYPESPECIFIC Device-specific event.
DBT_CONFIGCHANGED Current configuration has changed.
DBT_DEVNODES_CHANGED Device node has changed. Note This member function is called by the framework to allow your application to handle a Windows message. The parameters passed to your function reflect the parameters received by the framework when the message was received. If you call the base-class implementation of this function, that implementation will use the parameters originally passed with the message and not the parameters you supply to the function.
CWnd Overview [解决办法] Class Members [解决办法] Hierarchy Chart
See Also WM_DEVICECHANGE
[解决办法] IIRC, afx_msg 是VC++用来糊弄自己的, 它需要知道告诉自己,这是个消息响应函数,你知道它很笨的,笨人就得有笨办法。 _T 是一个宏,在define了UNICODE宏时,_T("x")会展开为L"x",否则展开为 "x" afx_msg, _T两个宏都有#define的