How to concatenate two unicode strings

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Hi I've used the following code for this :

C#

DbgPrint("\n File name volume is %wZ",&dosName);
    str.MaximumLength = (USHORT)dosName.Length;
    //status = RtlAppendUnicodeStringToString(&teststr, &Data->Iopb->TargetFileObject->FileName);
    status = RtlUnicodeStringToAnsiString(&str, &dosName, TRUE);
    DbgPrint("\n status is :  %s",status);
    DbgPrint("\n New  Data %Z", str);

    DbgPrint("\n Data %wZ", &Data->Iopb->TargetFileObject->FileName);

but this one is not working at all and status is showing null value in DebugView

please suggest me some alternatives

Posted 23-Apr-15 1:45am

Member 11460356

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2 solutions

Solution 1

The status value returned by RtlUnicodeStringToAnsiString is not a string but a numeric value: see https://msdn.microsoft.com/en-gb/library/cc704588.aspx[^].

Posted 23-Apr-15 3:47am

Richard MacCutchan

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Member 11460356 · Accepted Answer · 2015-05-03T19:40:00

Solution 2

C#

NameLength = (USHORT)dosName.MaximumLength + Data->Iopb->TargetFileObject->FileName.MaximumLength + 2;
    NameBuffer = ExAllocatePoolWithTag(PagedPool,NameLength,NC_MAPPING_TAG);
    NameString.Length = 0;
    NameString.MaximumLength = NameLength;
    NameString.Buffer = NameBuffer;
    RtlCopyUnicodeString(&NameString, &dosName);
    RtlAppendUnicodeStringToString(&NameString, &Data->Iopb->TargetFileObject->FileName);

Here we need to allocate pool for string. But Be careful pool allocation may lead to BSOD.

Posted 3-May-15 19:40pm

Member 11460356

Comments

Dale Seeley 18-May-22 2:39am

This post is old but I came across it with limited understanding at first and can confirm this works great! the code is basically the same in pure C if anyone needs it.

ULONG PROC_TAG = 0;
UNICODE_STRING processName;

processName.Length = 0;
processName.MaximumLength = (USHORT)DoSPath.MaximumLength + Data->Iopb->TargetFileObject->FileName.MaximumLength + 2;
processName.Buffer = ExAllocatePoolWithTag(PagedPool, processName.MaximumLength, PROC_TAG);

RtlCopyUnicodeString(&processName, &DoSPath);
RtlAppendUnicodeStringToString(&processName, &Data->Iopb->TargetFileObject->FileName);
KdPrint(("%wZ \r\n", processName));

cheers and thank you to the original solution!