{"id":165,"date":"2007-01-11T18:37:31","date_gmt":"2007-01-11T16:37:31","guid":{"rendered":"https:\/\/alax.info\/blog\/165"},"modified":"2007-01-11T18:41:57","modified_gmt":"2007-01-11T16:41:57","slug":"wtl-style-notification-message-cracking-macros-for-common-control-notifications","status":"publish","type":"post","link":"https:\/\/alax.info\/blog\/165","title":{"rendered":"WTL style notification message cracking macros for common control notifications"},"content":{"rendered":"

Windows Template Library<\/a> contains atlcrack.h<\/em> header file with macros to reinterpret window message parameters: split if required and cast to proper type. For instance, instead of:<\/p>\n

MESSAGE_HANDLER_EX(WM_SIZE, OnSize)
\n…
\nLRESULT OnSize(UINT, WPARAM wParam, LPARAM lParam)
\n{
\nUINT nType = (UINT) wParam;
\nCSize Extent(LOWORD(lParam), HIWORD(lParam));<\/em><\/p><\/blockquote>\n

it allows to make things simpler and in a more reliable fashion:<\/p>\n

MSG_WM_SIZE(OnSize)
\n…
\nLRESULT OnSize(UINT nType, CSize Extent)
\n{<\/em><\/p><\/blockquote>\n

However, WTL’s macros only crack messages. WM_NOTIFY<\/a><\/em> notifications are to be handled using MSG_WM_NOTIFY<\/em> macro and the parameters are to be casted in each hander.<\/p>\n

An aiwtlcrack.h<\/em> header file included into project below defines macros to crack notifications for common controls (commctrl.h<\/em> defined in header file in Platform SDK). The header defines, for example, macros: MSG_NM_DBLCLK<\/em><\/strong>, MSG_LVN_ITEMCHANGED<\/em><\/strong>, MSG_TVN_CUSTOMDRAW<\/em><\/strong> etc. Some of the notifications are duplicated to be able to use specific of the control class. For example, NM_CUSTOMDRAW<\/em><\/a> notification message for a list view can be handled with both MSG_NM_CUSTOMDRAW<\/em> and MSG_LVN_CUSTOMDRAW<\/em>. In the latter case the argument will be casted to NMLVCUSTOMDRAW<\/em><\/a>.<\/p>\n

<\/p>\n

Code excerpt from tiny sample project:<\/p>\n

BEGIN_MSG_MAP_EX(CMainDialog)
\nMSG_WM_INITDIALOG(OnInitDialog)
\nCOMMAND_ID_HANDLER_EX(IDOK, OnCommand)
\nCOMMAND_ID_HANDLER_EX(IDCANCEL, OnCommand)
\n MSG_LVN_GETDISPINFO(IDC_LISTVIEW, OnGetDispInfo)
\nMSG_LVN_GETINFOTIP(IDC_LISTVIEW, OnGetInfoTip)
\nMSG_LVN_DBLCLK(IDC_LISTVIEW, OnDblClk)
\n<\/strong>END_MSG_MAP()
\n…
\nLRESULT OnGetDispInfo(NMLVDISPINFO* pHeader)
\n{
\n…
\n}
\nLRESULT OnGetInfoTip(NMLVGETINFOTIP* pHeader)
\n{
\n…
\n}
\nLRESULT OnDblClk(NMITEMACTIVATE*)
\n{
\n…
\n}<\/p><\/blockquote>\n

Visual C++.NET 2003 source code can be downloaded here<\/a>, compiled binary – here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Windows Template Library contains atlcrack.h header file with macros to reinterpret window message parameters: split if required and cast to proper type. For instance, instead of: MESSAGE_HANDLER_EX(WM_SIZE, OnSize) … LRESULT OnSize(UINT, WPARAM wParam, LPARAM lParam) { UINT nType = (UINT) wParam; CSize Extent(LOWORD(lParam), HIWORD(lParam)); it allows to make things simpler and in a more reliable… <\/p>\n

Read the full article<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,13,20],"tags":[],"class_list":["post-165","post","type-post","status-publish","format-standard","hentry","category-atl","category-source","category-wtl"],"_links":{"self":[{"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/posts\/165","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/comments?post=165"}],"version-history":[{"count":0,"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/posts\/165\/revisions"}],"wp:attachment":[{"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/media?parent=165"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/categories?post=165"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/alax.info\/blog\/wp-json\/wp\/v2\/tags?post=165"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}