ssrs qr code istream& istream& read(char* buffer, int n); char* buffer, int n); read(unsigned in Software

Drawing QR-Code in Software istream& istream& read(char* buffer, int n); char* buffer, int n); read(unsigned

istream& istream& read(char* buffer, int n); char* buffer, int n); read(unsigned
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int gcount();
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The second version of read ( > is used to transfer bit strings.
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EXAMPLE 12.22 Transferring Bytes with the tin . read ( ) main0 char buffer[] = . . . cin.read(buffer, 8); tout << " [ " << buffer << "1; read: cin.read(buffer, 4); tout << " [ " << buffer << "1; read:
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// 20 ' 's ;/ transfer 8 bytes buffer ' -c< cin.gcount() << endl; // transfer 4 bytes buffer ' << cin.gcount() << endl;
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This example illustrates use of the read ( ) function and the gcount ( ) function. First it initializes buffer with20 s.Thenweuse cin.read(buffer, 8 ) to transfer the first 8 bytes from c in to buf f er. The output then shows that only the first 8 bytes of buf f er have been changed. Note that no null character i\ 0 I has been appended to those 8 bytes. The second read ( > repeats the process with the next 4 bytes, leaving the other 16 bytes unchanged.
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12.7 UNFORMATTED OUTPUT FUNCTIONS
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The is t ream class defines functions for unformatted output that are analogous to unformatted input functions. The two versions of the put ( > functions:
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int put(char c); ostream& put(char c);
function are the inverses of the corresponding get ( )
They both insert the character
into the output stream.
STREAM I/O
[CHAP. 12
EXAMPLE 12.23 Using the tout . put ( ) Function
This example shows the parallel nature of the put ( c ) and get ( c ) functions:
#include <iostream.h>
main0 1 char c; while (cin.get(c)) cout.put(c); tout << endl;
EXAMPLE 12.24 Chaining the tout . put ( ) Function
This example shows how the second version of the put ( c ) function can be concatenated into a chain of calls:
#include main0 cout.put('H').put('e').put('l').put('l').put('o').put('\n'); HeT2u _ <iostream.h>
This works because tout . put ( > returns the tout object itself.
The write0 functions:
ostream& ostream&
function has versions that are the inverses of the corresponding read ( )
write(const char* buffer, int n); write(const unsigned char* buffer, int n bytes from buffer to the output stream. Function
They both transfer
EXAMPLE 12.25 Using the tout . write ( ) #include <iostream.h>
main0 -t cout.write("ABCDEFGHIJKLMNOPQRSTUVWXYZ", tout << endl; cout.write("0123456789", 4); tout << endl;
CHAP. 121
STREAM I/O
Here is the output:
ABCDEFCH .
Like the corresponding r ead0 function, the version ofthe write0 function is U sed to transfer bit strings. When bytes are sent to an output stream they are bz&Gered. This means that they are first accumulated in a region of memory called a buffer, so that they can be sent later in batch mode to the output stream. The step that empties the output buffer and sends the string of bytes to the output stream is called flushing the output b~$kr. The ostream function flush ( ) performs this essential task. It is usually used indirectly by using the stream manipulator endl.
12.8 STREAM MANIPULATORS
A stream manipulator is a special kind of stream class member function. When used with the insertion and extraction operators, they look like objects. But they really are function calls. For example, tout -CC endl; is actually a call to the stream manipulator function end1 ( > . Here s how it works. The OS t ream class includes the following overloaded insertion operator:
ostream& operator<c(ostream& { return (*p)(*this); } (*p) (ostream&))
The parameter ( *p) (ostream&) is a pointer to a function (see OS tream parameter. When the statement
tout CC endl;
6.14) that has a single
is executed, operator<< is invoked, passing the end1 ( ) function to is as the parameter. But since this is a function parameter, the function pointer p is used to point to that function. So when operator<< is invoked, p points to the end1 ( ) function. This function is defined as
ostream& endl(ostream& ostr)
ostr.put('\n'); ostr.flush();
So when the statement tout << endl; is executed, operator<< is invoked with p pointing to the tout . end1 ( > function, so that the statement
return (*p>(*this);
becomes
return cout.endl(*this);
which prints a newline, flushes cow, and then returns tout. The next example shows how you can write your own stream manipulator.
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