\nThe dialog loop is actually quite simple. At its core,\nit’s just<\/p>\n
\nwhile (<dialog still active> &&\n GetMessage(&msg, NULL, 0, 0, 0)) {\n if (!IsDialogMessage(hdlg, &msg)) {\n TranslateMessage(&msg);\n DispatchMessage(&msg);\n }\n}\n<\/pre>\n\nIf you want something fancier in your dialog loop,\nyou can take the loop above and tinker with it.\n<\/p>\n
\nBut let’s start from the beginning.\nThe work happens in DialogBoxIndirectParam.\n(You should already know by now how to convert all\nthe other DialogBoxXxx functions into DialogBoxIndirectParam<\/a>.)\n<\/p>\n\nINT_PTR WINAPI DialogBoxIndirectParam(\n HINSTANCE hinst,\n LPCDLGTEMPLATE lpTemplate, HWND hwndParent,\n DLGPROC lpDlgProc, LPARAM lParam)\n{\n \/*\n * App hack! Some people pass GetDesktopWindow()\n * as the owner instead of NULL. Fix them so the\n * desktop doesn't get disabled!\n *\/\n if (hwndParent == GetDesktopWindow())\n hwndParent = NULL;\n<\/pre>\n\nThat’s right, we start with an app hack.\n\nThe problem of passing GetDesktopWindow() instead of NULL\nwas discussed\nin an earlier entry<\/a>.\nSo many people make this mistake that we had to put this app hack\ninto the core OS. It would be pointless to make a shim for it\nsince that would mean that thousands of apps would need to be shimmed.\n<\/p>\n\nSince only top-level windows can be owners, we have to\ntake the putative hwndParent<\/code>\n(which might be a child window) and walk up the window hierarchy\nuntil we find a top-level window.<\/p>\n\n if (hwndParent)\n hwndParent = GetAncestor(hwndParent, GA_ROOT);\n<\/pre>\n\nWith that second app hack out of the way, we create the dialog.\n<\/p>\n
\n HWND hdlg = CreateDialogIndirectParam(hinst,\n lpTemplate, hwndParent, lpDlgProc,\n lParam);\n<\/pre>\n\nNote: As before, I am going to ignore error checking and\nvarious dialog box esoterica because it would just be\ndistracting from the main point of this entry.\n<\/p>\n
\n\nModal windows disable their parent<\/a>, so do it here.\n<\/p>\n\n BOOL fWasEnabled = EnableWindow(hwndParent, FALSE);\n<\/pre>\n\nWe then fall into the dialog modal loop:\n<\/p>\n
\n MSG msg;\n while (<dialog still active> &&\n GetMessage(&msg, NULL, 0, 0)) {\n if (!IsDialogMessage(hdlg, &msg)) {\n TranslateMessage(&msg);\n DispatchMessage(&msg);\n }\n }\n<\/pre>\n