Timers

SetTimer Function

The SetTimer function creates a timer with the specified time-out value.

This is a small example that will explain you how to use timer function in vc++
Step 1: Create a sample MFC project.
Step 2: create a member variable in the dialog class .h file
Example, UINT m_nTimerID;
Step 3: In the constructor initialize the timer variable
m_nTimerID = 0;
Step 4: In the OnInitDialog function call settimer function
SetTimer(m_nTimerID, 5000, NULL);
Step 5: Write a handler for WM_TIMER message and write your code..
Example , AfxMessageBox(L"Hai");
Step 6: Create a button that will kill the timer
KillTimer(m_nTimerID);

Now when the application is launched , once in 5 seconds the message window "Hai" will appear .
If you want to stop the timer then call killTimer to kill the timer.

Sample LoadResource

Pic 1:
If we want to acess resources then we have to do the following steps

step 1:Add resource like in the pic 1 .
step2 :Type the data in the notepad & paste that in resource like pic 2.

Pic 2:

To acess the resource db we can use this code
CString dbData; dbData.LoadString(IDR_DBDATA1);
HGLOBAL hDB = NULL;
HRSRC hDBRes = FindResource(AfxGetResourceHandle(),MAKEINTRESOURCE(130),"DBDATA");
if (hDBRes==NULL) return;
DWORD size = SizeofResource(AfxGetResourceHandle(),hDBRes);
LPTSTR pRes = NULL;
hDB = LoadResource(AfxGetResourceHandle(),hDBRes);
if (!hDB) return;
pRes = (LPTSTR) (hDB);
FreeResource(hDB);
FreeResource(hDBRes);
CString csTmp = (CString) pRes;
AfxMessageBox(csTmp);

Sample FindWindow

HWND hwnd = NULL,hTmpWnd = NULL;

CWnd *WindowHandle = NULL;

LPCTSTR lpStr;

char szWndName[100],szCapWndName[20],szCapAddName[20]; c

har szCaptionName[100];

char szClassName[100]; BOOL bTrue = FALSE;
HWND hMainWnd = NULL;

HWND hCapWnd = NULL;

m_hAddressWnd = NULL;

hwnd = ::FindWindow("#32770","anadona - New Contact");

if (hwnd) { hTmpWnd = ::GetWindow(hwnd, GW_CHILD);
if ( hTmpWnd ) { ::GetWindowText(hTmpWnd, szWndName, sizeof(szWndName));
int i =0,b=0;

while (i<20)>

{ if (lstrcmp(szWndName,"Captured Text") == 0)

{ hCapWnd = hTmpWnd ;b++; }

if (lstrcmp(szWndName,"Address") == 0)

{m_hAddressWnd = hTmpWnd; b++;}

hTmpWnd = ::GetWindow(hTmpWnd, GW_HWNDNEXT);

::GetWindowText(hTmpWnd, szWndName, sizeof(szWndName));

i++; if (b==2) break;
}
hTmpWnd = hCapWnd;

::GetWindowText(hTmpWnd, szWndName, sizeof(szWndName));

if (lstrcmp(szWndName,"Captured Text") == 0)

{ hTmpWnd = ::GetWindow(hTmpWnd, GW_CHILD);

if ( hTmpWnd ) { ::GetClassName(hTmpWnd, szWndName, sizeof(szWndName));

lpStr = csAddressBlock;

::SendMessage(hTmpWnd,WM_SETTEXT,0,(LPARAM)lpStr);

hTmpWnd = ::GetWindow(hTmpWnd, GW_HWNDNEXT);

::GetWindowText(hTmpWnd, szCaptionName, sizeof(szCaptionName));

::GetClassName(hTmpWnd, szClassName, sizeof(szClassName));

while (bTrue == FALSE)

{

if ((lstrcmp(szCaptionName,"&Contact") == 0 ) && (lstrcmp(szClassName,"Button") == 0) )

{ bTrue = TRUE; break; }

hTmpWnd = ::GetWindow(hTmpWnd, GW_HWNDNEXT);

::GetWindowText(hTmpWnd, szCaptionName, sizeof(szCaptionName));

::GetClassName(hTmpWnd, szClassName, sizeof(szClassName)); }

::SendMessage(hTmpWnd,WM_LBUTTONDOWN, 1, 0);

::SendMessage(hTmpWnd,WM_LBUTTONUP, 1, 0); }

} } }

CMenu sample

1 . Create a menu.
2. In the OnInitDialog

CMenu menu;
menu.LoadMenu(IDR_MENU1);
SetMenu(&menu);

CMap serialization

Serialization of CMap
Serialization is a mechanism by which the objects in the memory are stored persistently in the hard diskso that they may be loaded/restored in the future.

Step 1:

Create the object of CmapCMap m_cMap;

Step 2:

Populate the contents of the Cmap

m_cMap[“one”] = 1;

m_cMap[“two”] = 2;
Step 3:

Store it persistently.

If this Cmap object goes out of scope then its values are lost. To persistently store them we write itscontents into a file. Following code snippet shows how to store an object's contents.

CFile cFileG;

if ( cFileG.Open("SampleFile.DB",CFile::modeCreateCFile::modeWrite) )

{CArchive cArchiveObj(&cFileG,CArchive::store);

m_cMap.Serialize(cArchiveObj);}
Step 4:

Load the contents for reinitialization.
Using this file we can initialize any Cmap object of the same type. Following code snippet shows howto load a files contents into an object.

CMap m_cLoadMap;
CFile cFileG;

if ( cFileG.Open("SampleFile.DB",CFile::modeRead) )

{CArchive cArchiveObj(&cFileG,CArchive::load);

m_cLoadMap.Serialize(cArchiveObj);}

ShellExecute sample

ShellExecute(NULL,"open","msdev.exe", csPathmake,NULL,SW_SHOW);

File manipulation

CFile ofile;

CFileException Ex;

CFileStatus objstatus;

TCHAR *pcontent = NULL;

CString csStr("");
if ( ! ofile.Open("g:\\Doc.txt",CFile::modeRead ,&Ex))

{ return; }

else

{

ofile.GetStatus(objstatus);
long lsize= objstatus.m_size;
pcontent = new TCHAR [lsize+1];
ofile.Read(pcontent,lsize);
pcontent[lsize]='\0';
csStr = pcontent;

ofile.Close();
if(pcontent)

{ delete [] pcontent; pcontent = NULL; }
}
if ( ! ofile.Open("g:\\Doc.txt",CFile::modeCreate CFile::modeWrite,&Ex)) { return; }

else

{

ofile.Write(csStr,csStr.GetLength());

}

Sample HTTP download

CInternetSession csiSession;
DWORD dwServiceType = 0; CString sServerName, sObject;
CString csData; INTERNET_PORT nPort; CString csTemp; int nPos=-1;
CString sGetFromURL ( _T("") );
sGetFromURL =csQuery;
if ( !AfxParseURL ( sGetFromURL, dwServiceType, sServerName, sObject, nPort ) )
throw;
CHttpConnection* pHTTPServer = NULL; pHTTPServer = csiSession.GetHttpConnection ( sServerName, nPort );
CHttpFile* pFile = NULL;
pFile = pHTTPServer->OpenRequest ( CHttpConnection::HTTP_VERB_GET, sObject, NULL, 1, NULL, NULL, INTERNET_FLAG_RELOAD );
pFile->SendRequest();
TCHAR sRaw [1024];
while ( pFile->ReadString ( sRaw, 1023 ) )
{ csData += sRaw; }
pFile->Close(); pHTTPServer->Close();

Sample DLL

In DLL
In sampDll.cpp
EXP int sum(int a , int b)
{ return (a+b);}
In sampDll.h
#define EXP extern "C" _declspec(dllexport)
In SampleDllapi.h
typedef int (FAR *sumfn) (int , int );
EXP int sum(int a , int b);
------------------------------------
In Exe

void CSampExeDlg::OnOK() { HMODULE hmodule = NULL; hmodule = ::LoadLibrary("SampDll.dll");
DWORD h ;
sumfn smp;
if ( hmodule ) { smp =(sumfn) GetProcAddress( hmodule,"sum");
}
int a = smp(2,7);
if ( hmodule ) {
::FreeLibrary(hmodule); }
CDialog::OnOK();}

CTreeCtrl sample

CBitmap bmpTrreIcons;
bmpTrreIcons.LoadBitmap( IDB_BITMAP1 );
m_ImageList.Create(16, 16, ILC_MASKILC_COLOR16, 0, 1);
m_ImageList.Add( &bmpTrreIcons , RGB(255,255,255));
m_TreeCtrl.SetImageList( &m_ImageList,LVSIL_NORMAL);
HTREEITEM hTree, hSub;
hTree = m_TreeCtrl.InsertItem("About me" , TVI_ROOT );
//m_TreeCtrl.Expand(hTree,TVE_EXPAND);
m_TreeCtrl.SetItemState( hTree, TVIS_EXPANDED TVIS_BOLD ,TVIS_EXPANDED TVIS_BOLD );
hSub = m_TreeCtrl.InsertItem("Personal",0, 1,hTree);
m_TreeCtrl.InsertItem("School",2, 2,hSub);
m_TreeCtrl.InsertItem("College",2, 2,hSub);
m_TreeCtrl.InsertItem("Company",0, 1,hSub);
m_TreeCtrl.Expand(hSub,TVE_EXPAND);

hSub = m_TreeCtrl.InsertItem("Official",0, 1,hTree);
m_TreeCtrl.InsertItem("1st company",2, 2,hSub);
m_TreeCtrl.InsertItem("2nd Company",4, 4,hSub);
m_TreeCtrl.Expand(hSub,TVE_EXPAND);

On Double Click

void CSampleOnDblclkTree1(NMHDR* pNMHDR, LRESULT* pResult)
{
CString csItemText;
CTreeCtrl* pCtrl = (CTreeCtrl*) GetDlgItem(IDC_TREE1);
ASSERT(pCtrl != NULL);
HTREEITEM hCurSel = pCtrl->GetNextItem(TVI_ROOT, TVGN_CARET);
if (hCurSel == NULL)
MessageBox(_T("There is no selected item"),"SampleTool",MB_TOPMOSTMB_APPLMODALMB_OKMB_ICONINFORMATION);
else
{
csItemText = pCtrl->GetItemText(hCurSel);
}
*pResult = 0;
}

CSplitterwnd with different number of rows and cloumns

On Mainframe class , we have to override OncreateClient function

m_wndSplitter1.CreateStatic(this,2,1);

m_wndSplitter.CreateStatic( &m_wndSplitter1 ,1,2,WS_CHILD WS_VISIBLE WS_BORDER,m_wndSplitter1.IdFromRowCol(0, 0) );m_wndSplitter.CreateView(0,0,RUNTIME_CLASS(CMyTreeView),CSize(70,70), pContext);m_wndSplitter.CreateView(0,1,RUNTIME_CLASS(CMyBroser),CSize(70,70), pContext);m_wndSplitter1.CreateView( 1,0,RUNTIME_CLASS(CMyListView),CSize(70,70), pContext);

bSplitterInit = TRUE;

return TRUE;

}