VC++ 2005 - Compilation Errors using "ifstream"

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marathoner - 14 Dec 2006 20:31 GMT

I tried your advice, and replaced "ifstream" with "std::ifstream". I also
replaced instances of "ofstream" with "std::ofstream". Those syntax errors
were resolved.
When I added "std" to the following statement: m_InFile.open(m_sFileName,
ios::in | ios::binary);
which became
m_InFile.open(m_sFileName, std::ios::in | std::ios::binary);

I get the following errors:

g:\program files\microsoft visual studio 8\vc\include\fstream(675) : error
C2248: 'std::basic_ios<_Elem,_Traits>::basic_ios' : cannot access private
member declared in class 'std::basic_ios<_Elem,_Traits>'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
g:\program files\microsoft visual studio 8\vc\include\ios(151) : see
declaration of 'std::basic_ios<_Elem,_Traits>::basic_ios'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
This diagnostic occurred in the compiler generated function
'std::basic_ifstream<_Elem,_Traits>::basic_ifstream(const
std::basic_ifstream<_Elem,_Traits> &)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]

Raj

"Doug Harrison [MVP]" <dsh@mvps.org> wrote in message
news:q6fun2tjdnfke37dodjmf00u8kdugk4ms8@4ax.com...

> On Tue, 12 Dec 2006 18:22:47 -0500, "Raj Kulkarni"
> <rajk2000@msn.com.invalid> wrote:
>
>>I am attempting to compile a project in Visual Studio 2005 which compiles
>>and links properly in VC++ 6.0. It seems to have problems with C++ i/o
>>functions. Here is the error I get:
>>
>>g:\src\analyzer\digitdialpages.h(136) : error C2146: syntax error :
>>missing
>>';' before identifier 'm_InFile'
>>Line 136: ifstream m_InFile;
>>
>>The statment: include <fstream> is at the top of the source file.
>>
>>Some assistance would be helpful. We didn't have any problems with using
>>ifstream or ofstream in VC++ 6.0. Thanks.
>
> Use std::ifstream, and read up on namespaces. See also:
>
> How to: Upgrade Projects from Previous Versions of Visual C++
> http://msdn2.microsoft.com/en-us/library/kyb7zzw4(VS.80).aspx
>
> VC6 -> VC2005 is a big jump. The old <iostream.h> headers have gone away,
> and you may have some issues moving to the standard <iostream> family.

Reply to this Message

Bo Persson - 14 Dec 2006 21:49 GMT

> I tried your advice, and replaced "ifstream" with "std::ifstream". I also
> replaced instances of "ofstream" with "std::ofstream". Those syntax errors
[quoted text clipped - 29 lines]
> _Traits=std::char_traits<char>
> ]

This looks like the compiler is trying to generate a copy constructor for
std::ifstream. Quite correctly, this doesn't work as the stream types are
not copyable.

Bo Persson

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marathoner - 15 Dec 2006 13:44 GMT

I guess what I should is to remove all references to C++ i/o and replace
them with C i/o (fopen, fclose, fprintf, ...). Is that correct?

Marathoner

>> I tried your advice, and replaced "ifstream" with "std::ifstream". I also
>> replaced instances of "ofstream" with "std::ofstream". Those syntax
[quoted text clipped - 35 lines]
>
> Bo Persson

Reply to this Message

David Wilkinson - 15 Dec 2006 14:14 GMT

> I guess what I should is to remove all references to C++ i/o and replace
> them with C i/o (fopen, fclose, fprintf, ...). Is that correct?

No, you should figure out what you are doing wrong. Never "sweep a
problem under the rug."

I suggest (based on Bo's observation) that you are trying to pass an
ostream or istream object by value. You must always pass them by reference.

David Wilkinson

Reply to this Message

Carl Daniel [VC++ MVP] - 15 Dec 2006 15:00 GMT

> I tried your advice, and replaced "ifstream" with "std::ifstream". I
> also replaced instances of "ofstream" with "std::ofstream". Those
[quoted text clipped - 3 lines]
> which became
> m_InFile.open(m_sFileName, std::ios::in | std::ios::binary);

You need:

std::ios_base::in | std::ios_base::binary

-cd

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VC++ 2005 - Compilation Errors using "ifstream"

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