\nThis is actually a lot less work than creating the frame,\nbelieve it or not.\n<\/p>\n
\nFor each control in the template, the corresponding child\nwindow is created. The control’s sizes and position is\nspecified in the template in DLUs, so of course they need\nto be converted to pixels.\n<\/p>\n
\n int x = XDLU2Pix(ItemTemplate.x);\n int y = YDLU2Pix(ItemTemplate.y);\n int cx = XDLU2Pix(ItemTemplate.cx);\n int cy = YDLU2Pix(ItemTemplate.cy);\n<\/pre>\n\nThe class name and caption also come from the template.\nThere are also the optional extra bytes
pExtra<\/code> which nobody uses\nbut which remain in the template definition for historical reasons.\nOnce that information has been collected,\nit’s\ntime to make the donuts<\/a>.\n<\/p>\n\n HWND hwndChild = CreateWindowEx(\n ItemTemplate.dwExStyle | WS_EX_NOPARENTNOTIFY,\n pszClass, pwzCaption, ItemTemplate.dwStyle,\n x, y, cx, cy, hdlg, ItemTemplate.dwId,\n hinst, pExtra);\n<\/pre>\n\nNotice that the
WS_EX_NOPARENTNOTIFY<\/code> style is forced on\nfor dialog controls.\n<\/p>\n\nThis next part often trips people up. “When I try to create\nmy dialog, it fails and I don’t know why.” It’s probably\nbecause one of the controls on the dialog could not be created,\nusually\nbecause you forgot to register the window class for that\ncontrol. (For example, you forgot to call\n\nthe
InitCommonControlsEx<\/code> function<\/a>\nor\nyou forgot to\nLoadLibrary<\/code> the appropriate version of the RichEdit control.)\n<\/p>\n\n if (!hwndChild) {\n DestroyWindow(hdlg);\n return NULL;\n }\n<\/pre>\n\nThe
DS_NOFAILCREATE<\/code> style suppresses the failure check above.\n<\/p>\n\nBut if the control did get created, then it needs to be\ninitialized.\n<\/p>\n
\n SetWindowContextHelpId(hwndChild, ItemTemplate.dwHelpID);\n SetWindowFont(hwndChild, hf, FALSE);\n<\/pre>\n\nRepeat once for each item template, and you now have a dialog\nbox with all its child controls.\nTell the dialog procedure that it can initialize its child windows,\nshow the (now-ready) dialog box\n\nif we deferred the
WS_VISIBLE<\/code> bit\nwhen constructing the frame<\/a>,\nand return the dialog box to our caller, ready for action.\n<\/p>\n\n \/\/ The default focus is the first item that is a valid tab-stop.\n HWND hwndDefaultFocus = GetNextDlgTabItem(hdlg, NULL, FALSE);\n if (SendMessage(hdlg, WM_INITDIALOG, hwndDefaultFocus, lParam)) {\n SetDialogFocus(hwndDefaultFocus);\n }\n if (fWasVisible) ShowWindow(hdlg);\n return hdlg;\n}\n<\/pre>\n\nThe
SetDialogFocus<\/code> function\n\nwe saw last year<\/a>.\n<\/p>\n\nSo there you have it: You have now seen how dialog box\nsausages are made.\n<\/p>\n