convert BSTR to a long

[tojo]

I have a BSTR with the string "123". I need this as a long (or UINT).
How can I do this? I am a newbie, does it show?

Thanks,
Tom

 

[John Harrison]

I have a BSTR with the string "123". I need this as a long (or UINT).
How can I do this? I am a newbie, does it show?

Thanks,
Tom

Loop though the string one character at a time, each time round the loop
multiply the value you have so far by 10, and add the value of the latest
digit.

I.e. in pseudo code

long val = 0;
while (more digits)
{
val *= 10;
val += next digit;
}

In your example val will go like this

val = 0;
val = 0; // times 10
val = 1; // plus digit '1'
val = 10; // times 10
val = 12; // plus digit '2'
val = 120; // times 10
val = 123; // plus digit '3'

Get the picture?

john

 

[Stephen Howe]

I have a BSTR with the string "123". I need this as a long (or UINT).

How can I do this? I am a newbie, does it show?

It does indeed.

Questions on standard C++ should be asked here.

Questions on Microsoft technology (like BSTR) should be asked on Microsofts
news server: msnews.microsoft.com. There are 22+ newsgroups devoted to VC++
alone.

Stephen Howe

 

[Tom Lee]

I have a BSTR with the string "123". I need this as a long (or UINT).
How can I do this? I am a newbie, does it show?

Thanks,
Tom

First, you'll need to convert the BSTR to an ordinary sequence of
characters (wcstombs I think should do it for you - the docs are your
friend).

Then just use atoi/atol to convert it.

Good luck.
Tom L