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by: Armando |
last post by:
i write one programm in vc++ but the compiler say that i use ambiguous
symbol,i don´t know why ? how can do to tell the compiler that is ok
so ? i become this error message:
error C2872: 'ifstream' : ambiguous symbol
error C2872: 'ofstream' : ambiguous symbol
error C2065: 'fileread' : undeclared identifier
error C2228: left of '.open' must have class/struct/union type
error C2228: left of '.eof' must have class/struct/union type
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by: tom |
last post by:
have seen a few posts about this but no solutions.
files larger than 2Gb don't open with ifstream.open
ie.
#include <fstream>
int main(in argc, char** argv){
ifstream in ;
in.open("3GBfile");
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by: Jing Cheng |
last post by:
Hi,
I'm using ifstream reading data from a file, as following:
ifstream finput("track.dat");
if(finput.fail()){
cerr << "Open input DATA file error!\n";
exit(-1);
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by: shawn |
last post by:
Hi All,
Am using MSVC6 compiler on a WinXP machine.
Am trying to read a file using std::ofstream;
the problem is that Tofstream.is_open() fails and Tifstream.rdstate()
returns "2" which translates to "The system cannot find the file
specified.".
This is really weird because the said file am tring to read exists on
the disk at the required location.
SNIPPET:-
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by: Karl |
last post by:
Hey everyone!
I've got a quick question on whether std::ifstream is buffered or not.
The reason is that I have a homework assignment that requires me to
benchmark copying files using different buffer sizes. I ended up doing
this using std::istream::readsome() and std::ostream::write():
// now try writing to the destination file
std::ifstream sourceStream(sourceFilename.c_str(),
std::ios::binary);
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by: manontheedge |
last post by:
i'm working on a C++ program that uses operator overloads (which i'm just learning to use), and i have the ostream working fine, but i'm thinking i'm using it wrong somehow because the ofstream doesn't work. Here's some code fragments...
class matrix
{
public:
......
friend ostream& operator << ( ostream& os, matrix& m );
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by: marathoner |
last post by:
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:
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by: Gary Wessle |
last post by:
hi
I have a code, the part which is troubling goes like this
****************************************************************
#include <istream>
#include <ostream>
#include <fstream>
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by: adramolek |
last post by:
So... I'm trying to get used to using C++ ifstream (or ofstream)
instead of stdio (although I'm having second thoughts). Anyways, I
want to be able to display a meaningful error message if ifstream
fails to open a file, but nothing I read about ifstream says anything
about a reliable place to get an error message. Using stdio I can
simply do:
FILE *f = fopen(filename, "rb");
if (!f)
perror(filename);
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
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by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
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by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
|
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
|
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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