DLGITEMTEMPLATEEX  32.VTVO 

The DLGITEMTEMPLATEEX structure is not defined in any standard header file. The structure definition is provided here to explain the format of an extended template for a dialog box.

For each control in a dialog box, an extended dialog box template has a block of data that uses the DLGITEMTEMPLATEEX format to describe the control. For a description of the format of an extended dialog box template, see DLGTEMPLATEEX2H7DDZ.

// typedef struct { 

//     DWORD  helpID;

//     DWORD  exStyle;

//     DWORD  style;

//     short  x;

//     short  y;

//     short  cx;

//     short  cy;

//     WORD   id;

//     sz_Or_Ord windowClass; // name or ordinal of a window class

//     sz_Or_Ord title;       // title string or ordinal of a resource

//     WORD   extraCount;     // bytes of following creation data

// } DLGITEMTEMPLATEEX;

Members

helpID

Specifies the help context identifier for the control. When the system sends a WM_HELPD98_NQ message, it passes the helpID value in the dwContextId member of the HELPINFO8EBBKX structure.

dwExtendedStyle

Specifies extended styles for a window. This member is not used to create controls in dialog boxes, but applications that use dialog box templates can use it to create other types of windows.

style

Specifies the style of the control. This member can be a combination of window style values (such as WS_BORDER) and one or more of the control style values (such as BS_PUSHBUTTON and ES_LEFT).

x

Specifies the x-coordinate, in dialog box units, of the upper-left corner of the control. This coordinate is always relative to the upper-left corner of the dialog box s client area.

y

Specifies the y-coordinate, in dialog box units, of the upper-left corner of the control. This coordinate is always relative to the upper-left corner of the dialog box s client area.

cx

Specifies the width, in dialog box units, of the control.

cy

Specifies the height, in dialog box units, of the control.

id

Specifies the control identifier.

windowClass

Specifies a variable-length array of 16-bit elements that identifies the window class of the control. If the first element of this array is any value other than 0xFFFF, the system treats the array as a null-terminated Unicode string that specifies the name of a registered window class.

If the first element is 0xFFFF, the array has one additional element that specifies the ordinal value of a predefined system class. The ordinal can be one of the following atom values.

title

Specifies a variable-length array of 16-bit elements that contains the initial text or resource identifier of the control. If the first element of this array is 0xFFFF, the array has one additional element that specifies an ordinal value that identifies a resource, such as an icon, in an executable file. You can use a resource identifier for controls, such as static icon controls, that load and display an icon or other resource rather than text.

If the first element is any value other than 0xFFFF, the system treats the array as a null-terminated Unicode string that specifies the initial text.

extraCount

Specifies the number of bytes of creation data that follow this member. If this value is greater than zero, the creation data begins at the next DWORD boundary. This creation data can be of any size and format. The control s window procedure must be able to interpret the data. When the system creates the control, it passes a pointer to this data in the lParam parameter of the WM_CREATE2RE1YT3 message that it sends to the control.

Remarks

An extended template for a dialog box consists of a DLGTEMPLATEEX header followed by a DLGITEMTEMPLATEEX structure for each control in the dialog box.

Each DLGITEMTEMPLATEEX structure must be aligned on a DWORD boundary. The variable-length windowClass and title arrays must be aligned on WORD boundaries. The creation data array, if any, must be aligned on a DWORD boundary.

If you specify character strings in the windowClass and title arrays, you must use Unicode strings. To create code that works on both Windows NT and Windows 95, use the MultiByteToWideChar function to generate these Unicode strings.

The x, y, cx, and cy members specify values in dialog box units. You can convert these values to screen units (pixels) by using the MapDialogRect function.

See Also