error C2664: 'void ATL::CStringT::Format(const wchar_t *,...)' : cannot convert parameter 1 from 'const char [3]' to 'const wc

If you are getting following error:

error C2664: 'void ATL::CStringT::Format(const wchar_t *,...)' : cannot convert parameter 1 from 'const char [3]' to 'const wchar_t *'

Solution1:

In Project Menu select your Project Properties.

In Configuration Properties

Set "Character Set" as "Use Multi-Byte Character Set"

Solution2:
where ever you are declaring "CString" variable add Unicode support.
Example:
CString csStr(_T("")); //_T("") is for unicode support

MFC Code to get Process Name & Process ID and kill by process ID

#include "Tlhelp32.h"
#include "winbase.h"


// Function to kill Process using Process ID
int Killprocess(int nProcessID)
{
HANDLE hProcess = OpenProcess( PROCESS_TERMINATE, 0, nProcessID );
if (hProcess == NULL)
return -1;
BOOL nReturnVal = TerminateProcess( hProcess, 9 );
CloseHandle (hProcess);
return nReturnVal;
}


// Function to get all Process Name and Process ID
CString GetProcessNameandID()
{
HANDLE hSnapShot;
hSnapShot=CreateToolhelp32Snapshot (TH32CS_SNAPALL,NULL);
PROCESSENTRY32 pEntry;
pEntry.dwSize =sizeof(pEntry);
CString csProcessList;
DWORD dwID;
CString csProcessID;
//Get first process
Process32First (hSnapShot,&pEntry);
//Get all processes
while(1)
{
BOOL hRes=Process32Next (hSnapShot,&pEntry);
if(hRes==FALSE)
break;
csProcessList=csProcessList+pEntry.szExeFile;
dwID=pEntry.th32ProcessID;
csProcessID.Format("%i",dwID);
csProcessList=csProcessList +" "+csProcessID +"\r\n" ;
}
return csProcessList;
}

MFC code to Download a webPage

#include "afxinet.h" //add this header file

BOOL DownloadURL(const char *url, const char *filename, CString &errorMessage)
{
const int FILEBUFLEN = 1024;
char httpBuff[FILEBUFLEN];
TCHAR szErr[255];
errorMessage = "";

TRY {
CInternetSession session;
session.SetOption(INTERNET_OPTION_CONNECT_TIMEOUT, 1000);
session.SetOption(INTERNET_OPTION_CONNECT_RETRIES, 3);
CFile *remoteFile = session.OpenURL(url, 1 ,INTERNET_FLAG_TRANSFER_BINARY | INTERNET_FLAG_RELOAD);
CFile localFile(filename, CFile::modeCreate | CFile::modeWrite | CFile::typeBinary);
int numBytes;
while (numBytes = remoteFile->Read(httpBuff, FILEBUFLEN))
{
localFile.Write(httpBuff, numBytes);
}
}
CATCH_ALL(error) {
error->GetErrorMessage(szErr,254,NULL);
errorMessage.Format("%s",szErr);
return FALSE;
}
END_CATCH_ALL;
return TRUE;
}

void CDownloadWebPageDlg::OnOK() //Copy the following Lines where you need to download.
{
CString csErr;
if(!DownloadURL("http://www.google.com","c:\\google.htm",csErr))
{
AfxMessageBox(csErr);
}
}

Hide the Taskbar application button

Open the .rc file in notepad
search for the line

"EXSTYLE WS_EX_APPWINDOW "

and replace "WS_EX_APPWINDOW" with "WS_EX_TOOLWINDOW".

Save and Close

MFC Code to avoid a Application running Many times

Paste this following code in BOOL CYourProjectNameApp::InitInstance() function of you Aplliction.


CreateMutex(NULL,TRUE,"Sample");
// mutex will be automatically deleted when process ends.
BOOL bAlreadyRunning = (GetLastError() == ERROR_ALREADY_EXISTS);
if(bAlreadyRunning)
{
::MessageBox(NULL, "This Appliction is Already Running ", "Information",
MB_ICONINFORMATION|MB_OK|MB_DEFBUTTON1);
return 0;
}

MFC Code to Close Task manager Automatically if it is lanched

BOOL g_bStopDialogWatcherThread = FALSE; // To Stop & start Thread

UINT DialogWatcher(LPVOID lpParam)
{
g_bStopDialogWatcherThread = FALSE;
while(1)
{
Sleep(300);
HWND hWnd = ::FindWindow(NULL,"Windows Task Manager");//Windows Task Manager


if(hWnd !=NULL)
{
// ::SetForegroundWindow(hWnd);
// ::SetFocus(hWnd);
// ::SetWindowPos(hWnd,HWND_TOPMOST,0,0,0,0,SWP_NOMOVE | SWP_NOSIZE );
// ::SendMessage(hWnd,WM_COMMAND,(WPARAM)0x0000025C,(LPARAM)0x0000025C);

::SendMessage(hWnd,WM_CLOSE,0,0);

}

if(g_bStopDialogWatcherThread)
{
break;
}
}
return 1;
}




void CFindWindowDlg::OnbtnClick()
{
AfxBeginThread(DialogWatcher,THREAD_PRIORITY_NORMAL,0,0,0);

}

void CFindWindowDlg::OnCancel()
{
g_bStopDialogWatcherThread = TRUE;
CDialog::OnCancel();
}

UnManaged and Managed (CLR) Data Type equivalants

Unmanaged Windows API types	Unmanaged C language types	CLR type
HANDLE	void*	IntPtr
BYTE	unsigned char	Byte
SHORT	short	Int16
WORD	unsigned short	UInt16
INT, LONG	int, long	Int32
BOOL	int, long	Int32 or Boolean
UINT	unsigned int	UInt32
DWORD, ULONG	unsigned long	UInt32
CHAR	char	Char
LPSTR, LPCSTR, LPWSTR, LPCWSTR	char*, wchar_t*	String or StringBuilder
FLOAT	float	Single
DOUBLE	double	Double