Cant Create Header File Dev C++

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Can't Create Header File Dev C Download
Open Dev File
C++ Header File Example

When you open a file, all kinds of things can go wrong. A file lives on a physical device — a fixed disk, for example, or perhaps on a flash drive or SD card — and you can run into problems when working with physical devices.

For example, part of the disk might be damaged, causing an existing file to become corrupted. Or, less disastrous, you might run out of disk space. Or, even less disastrous, you might try to open a file in a directory that doesn’t exist.

So what should I define in the header file vs the cpp file, and what inside the class definition vs outside? You might be tempted to put all of your member function definitions into the header file, inside the class. While this will compile, there are a couple of downsides to doing so. First, as mentioned above, this clutters up your class.

If you try to open a file for writing by specifying a full path and filename but the directory does not exist, the computer responds differently, depending on the operating system you’re using. If you’re unsure how your particular operating system will respond, try writing a simple test application that tries to create and open something like /abc/def/ghi/jkl/abc.txt. (Of course, you’ll want to be sure to use a directory that doesn’t exist.)

Then one of two things will happen: Either the directory and the file will get created, or nothing will happen.

For example, on a Windows system, if we attempt to create a file in a directory that doesn’t exist, the system does not create the directory. That’s because deep down inside, the application ultimately calls an operating system function that does the dirty work of creating the file. And this particular operating system function (it’s called CreateFile(), if you even care) has a rule that it will not create a directory for you.

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If you want to determine whether the ostream class was unable to create a file, you can call its fail() member function. This function returns true if the object couldn’t create the file. And that’s what happens when a directory doesn’t exist. The DirectoryCheck01 example shown demonstrates an example of this.

When you run this code, assuming that you don’t have a directory called /abc/def/ghi on your system, you should see the message Couldn’t open the file! Assuming that your particular operating system doesn’t create a directory in this case; if it does, your computer will open the file, write Hi to it, and move on with its happy life after closing things out.

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As an alternative to calling the fail() member function, you can use an operator available in various stream classes. This is !, fondly referred to as the “bang” operator, and you would use it in place of calling fail(), as in this code:

Most people prefer to use !outfile instead of outfile.fail(), although !outfile makes confusing code. The reason is that outfile is an object, and the notion of !outfile simply doesn’t make sense.

In fact, !outfile trips up many beginning programmers. They know that outfile is not a pointer in this sample code, and they wonder how you could test it against 0 as you normally can only do with a pointer. (Remember, by saying !x, where x is some pointer, you’re testing x against 0.) And that simply doesn’t make sense! And so, to avoid confusion, just call fail(). It makes more sense.

Here are some reasons your file creation may choke:

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The directory doesn’t exist.
You’re out of disk space and out of luck. Java generate key from string.
Your application doesn’t have the right permissions to create a file.
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The filename was invalid — that is, it contained characters the operating system doesn’t allow in a filename, such as * or ?.

Like any good application, your application should do two things:

1.Check whether a file creation succeeded.
2.If the file creation failed, handle it appropriately.
Don’t just print a horrible message like Oops!Aborting!, leaving your poor users with no choice but to toss the monitor onto the floor. Instead, do something friendlier — such as presenting a message telling them there’s a problem and suggesting that they might free more disk space.

File Handling in C++

File Handling concept in C++ language is used for store a data permanently in computer. Using file handling we can store our data in Secondary memory (Hard disk).

Why use File Handling in C++

For permanet storage.
The transfer of input - data or output - data from one computer to another can be easily done by using files.

For read and write from a file you need another standard C++ library called fstream, which defines three new data types:

Datatype	Description
ofstream	This is used to create a file and write data on files
ifstream	This is used to read data from files
fstream	This is used to both read and write data from/to files

How to achieve File Handling

Rc compressor vst free download mediafire. For achieving file handling in C++ we need follow following steps

Naming a file
Opening a file
Reading data from file
Writing data into file
Closing a file

Functions use in File Handling

Function	Operation
open()	To create a file
close()	To close an existing file
get()	Read a single character from a file
put()	write a single character in file.
read()	Read data from file
write()	Write data into file.

Defining and Opening a File

The function open() can be used to open multiple files that use the same stream object.

Example

Closing a File

A file must be close after completion of all operation related to file. For closing file we need close() function.

File Opening mode

Mode	Meaning	Purpose
ios :: out	Write	Open the file for write only.
ios :: in	read	Open the file for read only.
ios :: app	Appending	Open the file for appending data to end-of-file.
ios :: ate	Appending	take us to the end of the file when it is opened.

Both ios :: app and ios :: ate take us to the end of the file when it is opened. The difference between the two parameters is that the ios :: app allows us to add data to the end of file only, while ios :: ate mode permits us to add data or to modify the existing data any where in the file.

The mode can combine two or more parameters using the bitwise OR operator (symbol |)

Example

File pointer

Each file have two associated pointers known as the file pointers. One of them is called the input pointer (or get pointer) and the other is called the output pointer (or put pointer). The input pointer is used for reading the contents of a given file location and the output pointer is used for writing to a given file location.

Function for manipulation of file pointer

Transfer amazon music to spotify free mac. When we want to move file pointer to desired position then use these function for manage the file pointers.

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Function	Operation
seekg()	moves get pointer (input) to a specified location.
seekp()	moves put pointer (output) to a specified location.
tellg()	gives the current position of the get pointer.
tellp()	gives the current position of the put pointer.
fout . seekg(0, ios :: beg)	go to start
fout . seekg(0, ios :: cur)	stay at current position
fout . seekg(0, ios :: end)	go to the end of file
fout . seekg(m, ios :: beg)	move to m+1 byte in the file
fout . seekg(m, ios :: cur)	go forward by m bytes from the current position
fout . seekg(-m, ios :: cur)	go backward by m bytes from the current position
fout . seekg(-m, ios :: end)	go backward by m bytes from the end

put() and get() function

The function put() write a single character to the associated stream. Similarly, the function get() reads a single character from the associated stream.

read() and write() function

These function take two arguments. The first is the address of the variable V , and the second is the length of that variable in bytes. The address of variable must be cast to type char * (i.e pointer to character type).

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