The CPL_INQUIRE message is sent to the CPlApplet function of a Control Panel application to request information about a dialog box that the application supports.
CPL_INQUIRE uAppNum = (UINT) lParam1; // application number lpcpli = (LPCPLINFO) lParam2; // structure for application info.
If the CPlApplet function processes this message successfully, it should return zero.
The Control Panel sends the CPL_INQUIRE message once for each dialog box supported by your application. The Control Panel also sends a CPL_NEWINQUIRE 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.
On Windows 95 and Windows NT version 4.0, the system caches the information returned in the CPLINFO structure used by CPL_INQUIRE. This provides significantly better performance because the system only needs to load your application the first time the Control Panel starts up. On the other hand, the CPL_NEWINQUIRE message returns information in a form that the system cannot cache. For this reason, most CPlApplet functions should process CPL_INQUIRE and ignore CPL_NEWINQUIRE.
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.
CPL_GETCOUNT, CPL_INIT, CPL_NEWINQUIRE, CPlApplet, CPLINFO
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