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14016934
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2012-12-24T04:05:51.903
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2012-12-24T04:05:51.903
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1774667
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<pre><code>#include <Conio.h> #include <mutex> // C++11, if not C++11 find your own mutex std::vector<char> inputBuffer; std::mutex inputGuard; struct Locker { std::mutex* m; Locker(std::mutex& m_):m(&m_) { m->lock(); } void release() { if (m) m->unlock(); m = 0; } ~Locker() { release(); } } void AddToInputBuffer( char c ) { Locker lock(inputGuard); inputBuffer.push_back(c); printf("%c",c); } std::string FinishInputBuffer() { Locker lock(inputGuard); std::string retval( inputBuffer.begin(), inputBuffer.end() ); inputBuffer.clear(); printf("\n"); return retval; } void OverlappedPrintln( std::string s ) { Locker lock(inputGuard); for (int i = 0; i < inputBuffer.size(); ++i) { printf("%c", 8 /*backspace*/); } printf("%s\n", s.c_str()); for (int i = 0; i < inputBuffer.size(); ++i) { printf("%c", inputBuffer[i]); } } std::string readCharactersFromUser() { // TODO: Handle exiting while( int input = getch() ) { if (input == '\n') { return FinishInputBuffer(); AddToInputBuffer(input); } } </code></pre> Now, replace <code>cin.getline(message, 256);</code> with <code>std::string message = readCharactersFromuser()</code>, then check the length of the <code>string</code> before doing <code>(message[0] == 's' && message[1] == 'a' && message[2] == 'y' && message[3] == ' '</code> that. Elsewhere in the program, where you do <code>printf</code>, instead build a <code>std::string</code> and call <code>OverlappedPrintln</code> with it. The effect of this is that when you want to print something out, you lock a mutex, backspace over the user input, print out the message, do a newline, then print out the text you backspaced over, and release your mutex. The mutex isn't needed in 99% of situations, especially with modern computer speed, but it is good practice. The above code was not tested or compiled. Nor is it of the highest quality. The choice of non-echoing get character was because I cannot read from user input in a lock, and asynchronously echoing to the output might cause garbled text. So I read without echo, then echo within the mutex, such that <code>inputBuffer</code> always contains the characters that the user has both typed and I've echoed to the screen. This is an implementation of @NikBougalis 's answer.
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1. POhow to prevent over typing
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1. PTAnswer
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1. USYakk - Adam Nevraumont
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