The DialogBoxIndirectParam function uses the CreateWindowEx function to create the dialog box. DialogBoxIndirectParam then sends a WM_INITDIALOG message to the dialog box procedure. If the template specifies the DS_SETFONT style, the function also sends a WM_SETFONT message to the dialog box procedure. The function displays the dialog box (regardless of whether the template specifies the WS_VISIBLE style), disables the owner window, and starts its own message loop to retrieve and dispatch messages for the dialog box. When the dialog box procedure calls the EndDialog function, DialogBoxIndirectParam destroys the dialog box, ends the message loop, enables the owner window (if previously enabled), and returns the nResult parameter specified by the dialog box procedure when it called EndDialog.
In a standard dialog box template, the DLGTEMPLATE structure and each of the DLGITEMTEMPLATE structures must be aligned on DWORD boundaries. The creation data array that follows a DLGITEMTEMPLATE structure must also be aligned on a DWORD boundary. All of the other variable-length arrays in the template must must be aligned on WORD boundaries.
In an extended dialog box template, the DLGTEMPLATEEX header and each of the DLGITEMTEMPLATEEX control definitions must be aligned on DWORD boundaries. The creation data array, if any, that follows a DLGITEMTEMPLATEEX structure must also be aligned on a DWORD boundary. All of the other variable-length arrays in the template must be aligned on WORD boundaries.
All character strings in the dialog box template, such as titles for the dialog box and buttons, must be Unicode strings. To create code that works on both Windows NT and Windows 95, use the MultiByteToWideChar function to generate these Unicode strings.
Windows 95: The system can support a maximum of 16,364 window handles.
CreateWindowEx, DialogBox, DialogBoxIndirect, DialogBoxParam, DialogProc, DLGITEMTEMPLATE, DLGITEMTEMPLATEEX, DLGTEMPLATE, DLGTEMPLATEEX, EndDialog, MultiByteToWideChar, WM_INITDIALOG, WM_SETFONT
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