user-0 提问: 关于对话框函数的问题求助

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content: http://bbs.csdn.net/topics/390374955

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content: DialogBox The DialogBox macro creates a modal dialog box from a dialog box template resource. DialogBox does not return control until the specified callback function terminates the modal dialog box by calling the EndDialog function. The DialogBox macro uses the DialogBoxParam function.  int DialogBox(   HINSTANCE hInstance,  // handle to application instance   LPCTSTR lpTemplate,   // identifies dialog box template   HWND hWndParent,      // handle to owner window   DLGPROC lpDialogFunc  // pointer to dialog box procedure );   Parameters hInstance  Identifies an instance of the module whose executable file contains the dialog box template.  lpTemplate  Identifies the dialog box template. This parameter is either the pointer to a null-terminated character string that specifies the name of the dialog box template or an integer value that specifies the resource identifier of the dialog box template. If the parameter specifies a resource identifier, its high-order word must be zero and its low-order word must contain the identifier. You can use the MAKEINTRESOURCE macro to create this value.  hWndParent  Identifies the window that owns the dialog box.  lpDialogFunc  Pointer to the dialog box procedure. For more information about the dialog box procedure, see DialogProc.  Return Values If the function succeeds, the return value is the nResult parameter in the call to the EndDialog function used to terminate the dialog box.  If the function fails, the return value is –1. To get extended error information, callGetLastError.  Remarks The DialogBox macro uses the CreateWindowEx function to create the dialog box. DialogBox then sends a WM_INITDIALOG message (and a WM_SETFONT message if the template specifies the DS_SETFONT style) 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, DialogBox 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.   Windows 95 and later: The system can support a maximum of 255 controls per dialog box template. To place more than 255 controls in a dialog box, create the controls in the WM_INITDIALOG message handler rather than placing them in the template.  Windows CE: Not all styles are supported in the DLGTEMPLATE structure in the dialog template referred to by the lpTemplate parameter.  QuickInfo   Windows NT: Requires version 3.1 or later.   Windows: Requires Windows 95 or later.   Windows CE: Requires version 1.0 or later.   Header: Declared in winuser.h.   Import Library: Use user32.lib.   Unicode: Implemented as Unicode and ANSI versions on Windows NT.  See Also Dialog Boxes Overview, Dialog Box Functions, CreateDialog, CreateWindowEx, DialogBoxIndirect, DialogBoxIndirectParam, DialogBoxParam, DialogProc, EndDialog, MAKEINTRESOURCE, WM_INITDIALOG, WM_SETFONT     DialogProc The DialogProc function is an application-defined callback function used with the DialogBox function. It processes messages sent to a modal or modeless dialog box. The DLGPROC type defines a pointer to this callback function. DialogProc is a placeholder for the application-defined function name.   BOOL CALLBACK DialogProc(   HWND hwndDlg,  // handle to dialog box   UINT uMsg,     // message   WPARAM wParam, // first message parameter   LPARAM lParam  // second message parameter );   Parameters hwndDlg  Identifies the dialog box.  uMsg  Specifies the message.  wParam  Specifies additional message-specific information.  lParam  Specifies additional message-specific information.  Return Values Except in response to the WM_INITDIALOG message, the dialog box procedure should return nonzero if it processes the message, and zero if it does not. In response to a WM_INITDIALOG message, the dialog box procedure should return zero if it calls the SetFocus function to set the focus to one of the controls in the dialog box. Otherwise, it should return nonzero, in which case the system sets the focus to the first control in the dialog box that can be given the focus.   Remarks You should use the dialog box procedure only if you use the dialog box class for the dialog box. This is the default class and is used when no explicit class is specified in the dialog box template. Although the dialog box procedure is similar to a window procedure, it must not call the DefWindowProc function to process unwanted messages. Unwanted messages are processed internally by the dialog box window procedure.   QuickInfo   Windows NT: Requires version 3.1 or later.   Windows: Requires Windows 95 or later.   Windows CE: Requires version 1.0 or later.   Header: Declared in winuser.h.   Import Library: User-defined.  See Also Dialog Boxes Overview, Dialog Box Functions, CreateDialog, CreateDialogIndirect, CreateDialogIndirectParam, CreateDialogParam, DefWindowProc, DialogBox, DialogBoxIndirect, DialogBoxIndirectParam, DialogBoxParam, SetFocus, WM_INITDIALOG