warning C4244: '=' : conversion from 'intptr_t' to 'long', possibleloss of data in VC++ 7.1

[Edward Diener]

I am getting the above warning when compiling a line in a file which
assigns an 'intptr_t' result to a 'long' variable. I do not see how
intptr_t can possibly be larger than a long unless intptr_t is a 64 bit
value and I know I am not compiling for 64 bit Windows.

[Jochen Kalmbach [MVP]]

Re: warning C4244: '=' : conversion from 'intptr_t' to 'long', possibleloss of data in VC++ 7.1

Hi Edward!

I am getting the above warning when compiling a line in a file which
assigns an 'intptr_t' result to a 'long' variable. I do not see how
intptr_t can possibly be larger than a long unless intptr_t is a 64 bit
value and I know I am not compiling for 64 bit Windows.

Maybe you have enabled /Wp64 compiler Flag

http://msdn2.microsoft.com/en-us/library/yt4xw8fh.aspx

This is ON by default for new VC2005 projects...

You can disable it in your project settings under "C/C++|General|Det ect
64-bit Portability Issues"

Greetings
Jochen

[Bronek Kozicki]

Re: warning C4244: '=' : conversion from 'intptr_t' to 'long', possible loss of data in VC++ 7.1

Edward Diener <ediener@no_spa m_incomm.comwro te:

I am getting the above warning when compiling a line in a file which
assigns an 'intptr_t' result to a 'long' variable. I do not see how
intptr_t can possibly be larger than a long unless intptr_t is a 64
bit value and I know I am not compiling for 64 bit Windows.

do you have /Wp64 compiler option set?

http://msdn.microsoft.com/library/en-us/vccore/html/vchowWp64Detect64BitPortabilityProblems.asp

B.

[Edward Diener]

Re: warning C4244: '=' : conversion from 'intptr_t' to 'long', possibleloss of data in VC++ 7.1

Jochen Kalmbach [MVP] wrote:

Hi Edward!

>I am getting the above warning when compiling a line in a file which
>assigns an 'intptr_t' result to a 'long' variable. I do not see how
>intptr_t can possibly be larger than a long unless intptr_t is a 64
>bit value and I know I am not compiling for 64 bit Windows.

>
Maybe you have enabled /Wp64 compiler Flag

http://msdn2.microsoft.com/en-us/library/yt4xw8fh.aspx

>
This is ON by default for new VC2005 projects...

Woops, you're right. Evidently it is on by default in VS2003 also. Thanks !