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POget a character at a given position in a linux console application
 

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  1. POget a character at a given position in a linux console application
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    <p>In the following program I'm trying to improve the function <code>GetCharAt</code> which returns a character at a given position and <code>SetCursorPosition</code> which moves the terminal cursor to a given position, in a <strong>linux</strong> C++ console application. But each function interferes with the other. for example in <code>main</code>, commenting out <code>SetCursorPosition</code> will bring back normal functionality of <code>GetCharAt</code>.</p> <pre><code>#include &lt;streambuf&gt; #include &lt;iostream&gt; using namespace std; #include &lt;stdio.h&gt; string console_string; struct capturebuf : public streambuf { streambuf* d_sbuf; public: capturebuf(): d_sbuf(cout.rdbuf()) { cout.rdbuf(this); } ~capturebuf() { cout.rdbuf(this -&gt; d_sbuf); } int overflow(int c) { if (c != char_traits&lt;char&gt;::eof()) { console_string.push_back(c); } return this -&gt; d_sbuf-&gt;sputc(c); } int sync() { return this -&gt; d_sbuf-&gt;pubsync(); } } console_string_activator; char GetCharAt(short x, short y) { if(x &lt; 1) x = 1; if(y &lt; 1) y = 1; bool falg = false; unsigned i; for(i = 0; 1 &lt; y; i++) { if(i &gt;= console_string.size()) return 0; if(console_string[i] == '\n') y--; } unsigned j; for(j = 0; console_string[i + j] != '\n' &amp;&amp; j &lt; x; j++) { if(i + j &gt;= console_string.size()) return 0; } if(i + j - 1 &lt; console_string.size()) return console_string[i + j - 1]; return 0; } void SetCursorPosition(short x,short y) { char buffer1[33] = {0}; char buffer2[33] = {0}; string a = "\e["; sprintf(buffer1,"%i",y); sprintf(buffer2,"%i",x); string xx = buffer1; string yy = buffer2; cout&lt;&lt; a + xx + ";" + yy + "f"; cout.flush(); } void SetCursorPosition2(short x, short y) { printf("\e[%i;%if",x,y); cout.flush(); } int main() { SetCursorPosition(1,1); // comment out this line for normal functionality cout &lt;&lt; "hello" "\n"; for(unsigned j = 1; j &lt;= 5; j++) { printf("%c",GetCharAt(j,1)); } cout&lt;&lt; "\n"; } </code></pre> <p>How can I change <code>SetCursorPosition</code> so that it does not interfere with <code>GetCharAt</code>?</p>
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