LINE_SENDDIALOGINSTANCEDATA
The LINE_SENDDIALOGINSTANCEDATA message causes TAPI to call the TUISPI_providerGenericDialogData function in the UI DLL associated with htDlgInst, passing it the parameter block pointed to by lpParams, of length dwSize.
LINE_SENDDIALOGINSTANCEDATA
htLine = (DWORD) htDlgInst;
htCall = (DWORD) 0;
dwMsg = LINE_SENDDIALOGINSTANCEDATA;
dwParam1 = (DWORD) lpParams;
dwParam2 = (DWORD) dwSize;
dwParam3 = (DWORD) 0;
Parameters
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htDlgInst
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The HTAPIDIALOGINSTANCE that was returned to the service provider when the dialog box instance was created using LINE_CREATEDIALOGINSTANCE.
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lpParams
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Pointer to a provider-specific parameter block that is conveyed to the UI DLL TUISPI_providerGenericDialogData function, the size of which is specified by dwSize. If this parameter is set to NULL, this is a request to close the dialog box immediately and clean up (the UI DLL should not invoke TUISPIDLLCALLBACK during this cleanup).
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dwSize
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The size in bytes of the parameter block to be conveyed to the UI DLL.