UNICODE_STRING总结..doc

UNICODE_STRING 总结 UNICODE_STRING: typedef struct _UNICODE_STRING {? USHORT? Length;???? //UNICODE占用的内存字*2；? USHORT? MaximumLength;? PWSTR? Buffer;} UNICODE_STRING ,*PUNICODE_STRING;参数定Lengthbuffer的字“NULL”MaximumLengthbuffer的的Up to MaximumLength bytes may be written into the??????????????????buffer without trampling memory.BufferPointer to a wide-character string指向ANSI_STRING： typedef struct _STRING {? USHORT? Length;? USHORT? MaximumLength;? PCHAR? Buffer;} STRING, *PANSI_STRING; WCAHR temp[] = LHello World！;?? //定 UNICODE_STRING str ; str.Buffer = temp; str.Length??= wcslen(temp)*sizeof(WCHAR)?? //这个长度为UNICODE字符串所占用的字 字符个数*2 ；? ??? 当使用UNICODE_STRING 要手UNICODE_STRING?的Length和MaximumLength 成Buffer后，Length和MaximumLength 成Buffer被自UNICODE_STRING作Length和MaximumLength 成 ?当ANSI，所以在ANSI_STRING，然后再使用RtlAnsiStringToUnicodeString 将其UNICODE_STRING，作。例： ANSI_STRING? str_a; UNICODE_STRING? str_u; WCHAR buf_u[1024] = L; str_a.Buffer = InputBuffer ;? //InputBuffer str_a.Length = str_a.MaximumLength = strlen(InputBuffer); //开辟UNICODE内存空 str_u.Buffer = buf_u; str_u.Length = str_u.MaximumLength = strlen(InputBuffer) * sizeof(WCHAR); RtlAnsiStringToUnicodeString(str_u, str_a , TRUE); //当RtlAnsiStringToUnicodeString第三个参数TRUE时，要用RtlFreeUnicodeString释放临时的UNICODE_STRING RtlFreeUnicodeString(str_u); 拼接UNICODE_STRING ? 当拼接UNICODE_STRING UNICODE的LengthUNICODE中存 WCHAR str1[] = L12345; UNICODE_STRING str2; str2.Buffer = ExAllocatePool(NonPagedPool, wcslen(str1)*sizeof(WCHAR)) str2.Length = 0; str2.MaximumLength = wcslen(str1)*sizeof(WCHAR); ?RtlAppendUnicodeToString(str2, str1); ?UNICODE 和 ExAllocatePool ?? 内核在UNICODE拼接或其他ExAllocatePool动态分配UNICODE的Buffer， UNICODE_STRING str; str.Buffer = ExAllocatePool(NonPagedPool, 50*sizeof(WCHAR)); str.Length = 0; str.MaximumLength = 50*sizeof(WCHAR); 但若是定UNICODE的指UNICODE ？? PUNICODE_STRING pStr; 因NonPagedPool），pStr指向 pStr = ExAllocatePool(NonPagedPool, 50*sizeof(WCHAR)); 接着初始化成 pStr.Length = 0; pStr.MaximumLength = ???; 如何初始化Buffer ？