Put the value of a pointer into a CString

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CComQIPtr spHst; 

HRESULT hr1 = CoCreateInstance( CClsid::m_CSFTHST, NULL, CLSCTX_LOCAL_SERVER, IID_ICSFTHST, (void **)&spHst);

Instead to debugging every time, i want to write the value of spHst to a log file. So i want to put the value of spHst into a CString variable. how do i do that?

Also is there anyway i can check if the pointer spHst is pointing to a valid location?

Posted 1-Feb-11 8:46am

amarasat

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Nish Nishant · Accepted Answer · 2011-02-01T08:50:00

Solution 1

Here's an example:

C++

int a;
int* p = &a;
CString s;
s.Format(L"%p", p);

Posted 1-Feb-11 8:50am

Nish Nishant

Comments

amarasat 1-Feb-11 15:04pm

This is what i have tried:

ICSFTHST* temp = spHst;

CString HSTPointer;

HSTPointer.Format(L"%temp", temp);

now the string HSTPointer has a value "temp".

is this correct, can you give me the solution for my code.

Nish Nishant 1-Feb-11 15:09pm

I already have. You need to use the %p formatter.

amarasat 1-Feb-11 15:16pm

i got it!!

is there a way to check if spHst is pointing to a valid location? Other than to chack if it hasa value or not, is there any way to see if it is a valid pointer or not?

Nish Nishant 1-Feb-11 15:19pm

There's no safe way to determine if a pointer is valid or not. Windows has functions such as IsBadWritePtr and IsBadReadPtr but they only tell you if you have read/write access to that memory.

amarasat 1-Feb-11 15:31pm

OK thanks a lot for your help in all the posts!! if i need anything i will post here.

thank you!!

Nish Nishant 1-Feb-11 15:33pm

You're welcome.

Harrison H 1-Feb-11 18:01pm

OMG dude I accidentally gave you a 1 when I meant to give you a 5!

Edit: alright looks like it let me fix it.

Sergey Alexandrovich Kryukov 1-Feb-11 20:20pm

My 5. I could not even figure out at first that the question was about string format...
--SA

amarasat 2-Feb-11 16:34pm

Am sorry, this question was a continuation of another question, so we were able to figure it out quick

RobNO 1-Feb-11 20:34pm

Sorry to bug but, i am wondering what 'L' represents. I very recently started win32 fyi.

Cheers,
robNO.

Nish Nishant 3-Feb-11 10:26am

The L denotes a wide character string.