Strings in Windows programming (2)

(1) Windows write log system

1 voidWritedebugeventlog (tchar*pszmessage, WORD wtype)2 {3     //#ifdef _DEBUG4 5HANDLE Heventsource =NULL;6     Consttchar* lpszstrings[2] ={null, null};7 8Heventsource = Registereventsourcew (NULL, L"Devicemonitorservice");9     if(Heventsource)Ten     { Onelpszstrings[0] = _t ("Devicemonitorservice"); Alpszstrings[1] =Pszmessage; -  -ReportEvent (Heventsource,//Event Log Handle theWtype,//Event Type -             0,//Event category -             0,//Event identifier -Null//No Security Identifier +             2,//Size of lpszstrings array -             0,//No binary Data +Lpszstrings,//Array of Strings ANull//No binary Data at             ); -  - Deregistereventsource (heventsource); -     } -     //#else -     //#endif//DEBUG in}

(2) writing a string to an array

1 TCHAR szmessage[260]; 2 ZeroMemory (Szmessage, ARRAYSIZE (szmessage)); 3 stringcchprintf (Szmessage, ARRAYSIZE (szmessage),4                 _t ("[Win32project1  ] Monitorid  %s  ,   attached Displaydevice.deviceid:%s   islocalmonitor%d"), Monitorid, Adisplaydevice.deviceid, islocalmonitor); 5 Writedebugeventlog (Szmessage, Eventlog_error_type);

Note:

stringcchprintf function (Strsafe.h)

 

Writes formatted data to the specified string. The size of the destination buffer is provided to the function to ensure so it does not write past the end of this Buffe R.

stringcchprintf is a replacement for the following functions:

• sprintf, swprintf, _stprintf
• wsprintf
• wnsprintf
• _snprintf, _snwprintf, _sntprintf

sprintf (<stdio.h>)

(3) TCHAR and String conversions (Std::string is a char-type character Set)

1 stringTchar2string (tchar*STR) {2     intIlen = WideCharToMultiByte (CP_ACP,0, STR,-1Null0, NULL, NULL);3     Char* Chrtn =New Char[ilen*sizeof(Char)];4WideCharToMultiByte (CP_ACP,0, STR,-1, CHRTN, Ilen, NULL, and NULL);5STD::stringstr (CHRTN);6     returnstr;7}

Note:

String

Header: <string>--c++ Standard library header file

Namespace:std

String	char type will basic_string The specialization of the template class is described as string . ">a type that describes A specialization of the template class  basic_string  with elements of Ty pe  char as a  string .
Wstring	A type that describes a specialization of the template class basic_string with elements of type wchar_t as a wstring.

Char string converted to Unicode string

1LPWSTR pwszout =NULL;2 if(Value! =NULL)3 {4     //    //Double NULL Termination5     intNoutputstrlen = MultiByteToWideChar (CP_ACP,0, Value,-1Null0);//Gets the length of the char string, including the length of the empty string6Pwszout =NewTchar[noutputstrlen];7 8memset (Pwszout,0, Noutputstrlen);9MultiByteToWideChar (CP_ACP,0, Value,-1, Pwszout, Noutputstrlen);Ten}

(4) Various data structures

typedef _null_terminated_ CONST WCHAR *lpcwstr, *pcwstr;

typedef LPCWSTR PCTSTR, LPCTSTR; --winnt.h

(5) Various types of string functions

STRRCHR, wcsrchr,_tcsrchr--

Header: stdio.h, String.h.

Scan a string for the last occurrence of a character.

Example: (_TCSRCHR (cmd, _t (' \ \ '))) [1] = 0;

Lstrcat--include Windows.h

Appends one string to another.

WarningDo not use. Consider using StringCchCatinstead.       See Security considerations.       Lstrcat (cmd, _t ("***.exe")); lstrcpy (ID, buff); (6) Other functions ZeroMemory macro--(include Windows.h)memset-- #include <memory.h>  #include <stdio.h>

Visual Studio 6.0sets buffers to a specified character.

void *memset ( void *dest, int c, size_t Count );

Routine	Required Header	Compatibility
Memset	<memory.h> or <string.h>	ANSI, win-up, win NT

Strings in Windows programming (2)