String operations in the driver

/If there is something wrong with this article, please give me some advice!

String Initialization

Define a variable of the unicode_string type. This is just an empty struct and we didn't allocate any memory to it. If you directly copy strings to them
An exception occurs. When we define a variable of this type, we should regard it as a wchar pointer without a "new" space, so we must go to the "new" space to give it.

Typedef struct

{

Ushort
Length;

Ushort
Maximumlength;

Pwchar
Buffer;

} Unicode_string,
* Punicode_string;

There are several methods:

1. rtlinitemptyunicodestring

Unicode_string STR;

Wchar wcsbuffer [1024] =
{0 };

Rtlemptyunicodestring (& STR, wcsbuffer,
Sizeof (wcsbuffer ));

This method is like defining a static string wchar
Wcsbuffer [1024] = {0 }.

2. dynamically apply for Space

Unicode_string STR;

Str. Buffer =
(Pwchar) exallocatepoolwithtag (nonpagepool, 1024, '123 ');

Str. Length = 0;

Str. maximumlength =
1024;

This method is like defining a wchar *
Pwcsbuffer = new wchar [1024];

After use, the memory must be released.

Exfreepool or exfreepoolwithtag.

3. Define the constant unicode_string

You can use the macro rtl_constant_string

Unicode_string STR =
Rtl_constant_string (L "My first string ");

Remember that this string cannot be modified, because it is like defining char
* STR = "123"; the string cannot be modified.

Copy string

Rtlcopyunicodestring (& DST,
& SRC );

String connection

Rtlappendunicodetostring (& DST, L "123 ");

Rtlappendunicodetounicodestring (& DST,
& SRC );

 

// The following table is reprinted and cannot find the source. Sorry!

String operation functions used in the driver
Here, we will compare ANSI and Unicode.

compare

strcmp

strncmp

_ stricmp

_ strnicmp

rtlcomparestring

rtlequalstring

wcscmp

wcsncmp

_ wcsicmp

_ wcsnicmp

rtlcompareunicodestring

rtlequalunicodestring

rtlprefixunicodestring

initialize

_ strset

_ strnset

rtlinitansistring

rtlinitstring

_ wcsnset

rtlinitunicodestring

Search

strchr

strrchr

strspns

strstr

wcschr

wcsrchr

wcsspns

wcsstr

upper/lowercase

_ strlwr

_ strupr

rtlupperstring,

_ wcslwr

_ wcsupr

rtlupcaseunicodestring

character

isdigit

islower

isprint

isspace

isupper

isxdigit

tolower

toupper

rtlupperchar

towolower

towupper

rtlupcaseunicodestring

Format

sprintf

vsprintf

_ snprintf

_ vsnprintf

swprintf

_ snwprintf

String Conversion

atoi

atoll

_ ITOA

_ itow

rtlintegertounicodestring

rtlunicodestringtointeger

& Lt; TD width = "110" valign = "TOP" & gt; & Lt; TD width = "204" & gt; & Lt; TD width = "242" & gt; & Lt; TD width = "110" valign = "TOP" & gt; & Lt; TD width = "204" & gt; & Lt; TD width = "242" & gt; & Lt; TD width = "110" valign = "TOP" & gt; & Lt; TD width = "204" & gt; & Lt; TD width = "242" & gt; & Lt; TD width = "110" valign = "TOP" & gt; & Lt; TD width = "204" & gt; & Lt; TD width = "242" & gt; & Lt; TD width = "110" valign = "TOP" & gt; & Lt; TD width = "204" & gt; & Lt; TD width = "242" & gt; & Lt; TD width = "110" valign = "TOP" & gt; & Lt; TD width = "204" & gt; & Lt; TD width = "242" & gt; & Lt; TD width = "110" valign = "TOP" & gt; & Lt; TD width = "204" & gt; & Lt; TD width = "242" & gt;

Operation	ANSI string functions	Unicode string functions
Length	Strlen	Wcslen
Concatenate	Strcat Strncat	Wcscat Wcsncat Rtlappendunicodestringtostring Rtlappendunicodetostring
Copy	Strcpy Strncpy Rtlcopystring	Wcscpy Wcsncpy Trlcopyunicodestring
Reverse	_ Strrev	_ Wcsrev
Type conversion	Rtlansistringtounicodestring Rtlansistringtounicodestring	Rtlunicodestringtoansistring
Memory release	Rtlfreeansistring	Rtlfreeunicodestring