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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| No
| Import Library
| -
| Header File
| cpl.h
| Unicode
| No
| Platform Notes
| None
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CPL_NEWINQUIRE
The CPL_NEWINQUIRE message is sent to the CPlApplet function of a Control Panel application to request information about a dialog
box that the application supports.
For better performance, most applications should ignore CPL_NEWINQUIRE and
process the CPL_INQUIRE message instead. The CPL_NEWINQUIRE message is useful only
for applications that need to change their icon or display strings based on
the state of the computer.
CPL_NEWINQUIRE
uAppNum = (UINT) lParam1; // application number
lpncpli = (LPNEWCPLINFO) lParam2; // structure for appl. info.
Parameters
uAppNum
Value of lParam1. Specifies the dialog box number. This number must be in the range zero
through one less than the value returned in response to the CPL_GETCOUNT message (CPL_GETCOUNT  1).
lpncpli
Value of lParam2. Specifies the address of a NEWCPLINFO structure. The Control Panel application should fill this structure with
information about the dialog box.
Return Values
If the CPlApplet function processes this message successfully, it should return zero.
Remarks
The Control Panel sends the CPL_NEWINQUIRE message once for each dialog box
supported by your application. The Control Panel also sends a CPL_INQUIRE message for each dialog box. These messages are sent immediately after the CPL_GETCOUNT message. However, the system does not guarantee the order in which the
CPL_INQUIRE and CPL_NEWINQUIRE messages are sent.
You can perform initialization for the dialog box when you receive
CPL_INQUIRE. If you must allocate memory, do so in response to the CPL_INIT message.
The CPL_NEWINQUIRE message was introduced in Windows version 3.1 as a
replacement for CPL_INQUIRE. However, CPL_INQUIRE is the preferred message for Windows
95 and Windows NT version 4.0. This is because CPL_NEWINQUIRE returns
information in a form that the system cannot cache. Consequently, applications that
process CPL_NEWINQUIRE must be loaded each time the Control Panel needs the
information, resulting in a significant reduction in performance.
The only applications that should use CPL_NEWINQUIRE are those that need to
change their icon or display strings based on the state of the computer. In this
case, your CPL_INQUIRE handler should specify the CPL_DYNAMIC_RES value for the idIcon, idName, or idInfo members of the CPLINFO structure, rather than specifying a valid resource identifier. This causes
the Control Panel to send the CPL_NEWINQUIRE message each time it needs the icon
and display strings, allowing you to specify information based on the current
state of the computer. Of course, this is significantly slower than using cached
information.
See Also
CPL_GETCOUNT, CPL_INIT, CPL_INQUIRE, CPlApplet, CPLINFO, NEWCPLINFO
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