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    <p>I implemented the following as a console for an opengl game I was writing a while ago. It is by no means a definitive answer to you question but it worked for me and you might get something useful out of it.</p> <p>The 2 files are at this bottom of this post. The code is unlikely to run directly as there is one for 2 library header files that I'm not going to include. If you want the full source let me know.</p> <p>Basically though the console class allows you to add variable pointers to it that can be changed at run time. It accepts input from the windows event messages. (The actual handling of input is done elsewhere) The command parsing is done in the ProcessInput() method and variables are updated in the ChangeVariable() method.</p> <p>A word of warning. This method essentially gives the console users direct access to the memory locations of the individual variable. This requires good input validation to ensure you the user cant cause the application to crash at runtime. If I ever sat down and tried to make another console I would likely do things slightly different. However I hope this gives you a little help.</p> <p>The header file:</p> <pre><code>#ifndef CONSOLE_H #define CONSOLE_H #include &lt;vector&gt; #include &lt;map&gt; #include &lt;string&gt; #include "Singleton.h" #include &lt;Windows.h&gt; #include "Enumerations.h" #include "StringConversion.h" class Console { public: Console(); ~Console(); void Update(std::vector&lt;WPARAM&gt; pressedKeys); void AddInt(std::string varName, int *ptrToInt); void AddFloat(std::string varName, float *ptrToFloat); void AddLong(std::string varName, long *ptrToLong); void AddBool(std::string varName, bool *ptrToBool); const std::string &amp;GetCurrentText(); const std::vector&lt;std::string&gt; &amp;GetPreviousText(); private: std::map&lt;std::string, int *&gt; m_Ints; std::map&lt;std::string, float *&gt; m_Floats; std::map&lt;std::string, long *&gt; m_Longs; std::map&lt;std::string, bool *&gt; m_Bools; std::map&lt;std::string, std::string&gt; m_Variables; std::vector&lt;std::string&gt; m_PrevConsoleText; std::string m_CurrInput; int m_PrevSelection; bool ProcessInput(); void ChangeVariable(const std::string &amp;varName, const std::string &amp;value); }; typedef Singleton&lt;Console&gt; g_Console; #endif // CONSOLE_H </code></pre> <p>The cpp file:</p> <pre><code>#include "Console.h" Console::Console() { m_PrevSelection = 0; } Console::~Console() { } void Console::AddInt(std::string varName, int *ptrToInt) { m_Ints[varName] = ptrToInt; m_Variables[varName] = "int"; } void Console::AddFloat(std::string varName, float *ptrToFloat) { m_Floats[varName] = ptrToFloat; m_Variables[varName] = "float"; } void Console::AddLong(std::string varName, long *ptrToLong) { m_Longs[varName] = ptrToLong; m_Variables[varName] = "long"; } void Console::AddBool(std::string varName, bool *ptrToBool) { m_Bools[varName] = ptrToBool; m_Variables[varName] = "bool"; } void Console::ChangeVariable(const std::string &amp;varName, const std::string &amp;value) { //*(m_Bools[varName]) = value; std::string temp = m_Variables[varName]; if(temp == "int") { //*(m_Ints[varName]) = fromString&lt;int&gt;(value); } else if(temp == "float") { //*(m_Floats[varName]) = fromString&lt;float&gt;(value); } else if(temp == "long") { //*(m_Longs[varName]) = fromString&lt;long&gt;(value); } else if(temp == "bool") { if(value == "true" || value == "TRUE" || value == "True") { *(m_Bools[varName]) = true; } else if(value == "false" || value == "FALSE" || value == "False") { *(m_Bools[varName]) = false; } } } const std::string &amp;Console::GetCurrentText() { return m_CurrInput; } void Console::Update(std::vector&lt;WPARAM&gt; pressedKeys) { for(int x = 0; x &lt; (int)pressedKeys.size(); x++) { switch(pressedKeys[x]) { case KEY_A: m_CurrInput.push_back('a'); break; case KEY_B: m_CurrInput.push_back('b'); break; case KEY_C: m_CurrInput.push_back('c'); break; case KEY_D: m_CurrInput.push_back('d'); break; case KEY_E: m_CurrInput.push_back('e'); break; case KEY_F: m_CurrInput.push_back('f'); break; case KEY_G: m_CurrInput.push_back('g'); break; case KEY_H: m_CurrInput.push_back('h'); break; case KEY_I: m_CurrInput.push_back('i'); break; case KEY_J: m_CurrInput.push_back('j'); break; case KEY_K: m_CurrInput.push_back('k'); break; case KEY_L: m_CurrInput.push_back('l'); break; case KEY_M: m_CurrInput.push_back('m'); break; case KEY_N: m_CurrInput.push_back('n'); break; case KEY_O: m_CurrInput.push_back('o'); break; case KEY_P: m_CurrInput.push_back('p'); break; case KEY_Q: m_CurrInput.push_back('q'); break; case KEY_R: m_CurrInput.push_back('r'); break; case KEY_S: m_CurrInput.push_back('s'); break; case KEY_T: m_CurrInput.push_back('t'); break; case KEY_U: m_CurrInput.push_back('u'); break; case KEY_V: m_CurrInput.push_back('v'); break; case KEY_W: m_CurrInput.push_back('w'); break; case KEY_X: m_CurrInput.push_back('x'); break; case KEY_Y: m_CurrInput.push_back('y'); break; case KEY_Z: m_CurrInput.push_back('z'); break; case KEY_0: m_CurrInput.push_back('0'); break; case KEY_1: m_CurrInput.push_back('1'); break; case KEY_2: m_CurrInput.push_back('2'); break; case KEY_3: m_CurrInput.push_back('3'); break; case KEY_4: m_CurrInput.push_back('4'); break; case KEY_5: m_CurrInput.push_back('5'); break; case KEY_6: m_CurrInput.push_back('6'); break; case KEY_7: m_CurrInput.push_back('7'); break; case KEY_8: m_CurrInput.push_back('8'); break; case KEY_9: m_CurrInput.push_back('9'); break; case KEY_QUOTE: m_CurrInput.push_back('\"'); break; case KEY_EQUALS: m_CurrInput.push_back('='); break; case KEY_SPACE: m_CurrInput.push_back(' '); break; case KEY_BACKSPACE: if(m_CurrInput.size() &gt; 0) { m_CurrInput.erase(m_CurrInput.end() - 1, m_CurrInput.end()); } break; case KEY_ENTER: ProcessInput(); break; case KEY_UP: m_PrevSelection--; if(m_PrevSelection &lt; 1) { m_PrevSelection = m_PrevConsoleText.size() + 1; m_CurrInput = ""; } else { m_CurrInput = m_PrevConsoleText[m_PrevSelection - 1]; } break; case KEY_DOWN: if(m_PrevSelection &gt; (int)m_PrevConsoleText.size()) { m_PrevSelection = 0; m_CurrInput = ""; } else { m_CurrInput = m_PrevConsoleText[m_PrevSelection - 1]; } m_PrevSelection++; break; } } } bool Console::ProcessInput() { int x; std::string variable = "NULL", value; bool ok = false; std::string::iterator it; //Split up the input from the user. //variable will be the variable to change //ok will = true if the syntax is correct //value will be the value to change variable to. for(x = 0; x &lt; (int)m_CurrInput.size(); x++) { if(m_CurrInput[x] == ' ' &amp;&amp; variable == "NULL") { variable = m_CurrInput.substr(0, x); } else if(m_CurrInput[x] == '=' &amp;&amp; m_CurrInput[x - 1] == ' ' &amp;&amp; m_CurrInput[x + 1] == ' ') { ok = true; } else if(m_CurrInput[x] == ' ') { value = m_CurrInput.substr(x + 1, m_CurrInput.size()); } } if(ok) { m_PrevConsoleText.push_back(m_CurrInput); m_PrevSelection = m_PrevConsoleText.size(); if(m_PrevConsoleText.size() &gt; 10) { m_PrevConsoleText.erase(m_PrevConsoleText.begin(), m_PrevConsoleText.begin() + 1); } m_CurrInput.clear(); ChangeVariable(variable, value); } else { m_PrevConsoleText.push_back("Error invalid console syntax! Use: &lt;variableName&gt; = &lt;value&gt;"); m_CurrInput.clear(); } return ok; } const std::vector&lt;std::string&gt; &amp;Console::GetPreviousText() { return m_PrevConsoleText; } </code></pre> <p><strong>Edit 1: Added DrawConsole()</strong> I just get the text from the console class render an image that looked similar to the source engine console window found in any recent valve game and then the text gets drawn in the appropriate places.</p> <pre><code>void View::DrawConsole() { Square console; std::vector&lt;std::string&gt; temp; temp = g_Console::Instance().GetPreviousText(); console.top = Vector3f(0.0, 0.0, 1.0); console.bottom = Vector3f(640, 480, 1.0); g_Render::Instance().SetOrthographicProjection(); g_Render::Instance().PushMatrix(); g_Render::Instance().LoadIdentity(); g_Render::Instance().BindTexture(m_ConsoleTexture); g_Render::Instance().DrawPrimative(console, Vector3f(1.0f, 1.0f, 1.0f)); g_Render::Instance().DisableTexture(); g_Render::Instance().SetOrthographicProjection(); //Draw the current console text g_Render::Instance().DrawString(g_Console::Instance().GetCurrentText(), 0.6f, 20, 465); //Draw the previous console text for(int x = (int)temp.size(); x &gt; 0; x--) { g_Render::Instance().DrawString(temp[x-1], 0.6f, 20, (float)(425 - (abs((int)temp.size() - x) * 20))); } g_Render::Instance().SetPerspectiveProjection(); g_Render::Instance().PopMatrix(); g_Render::Instance().SetPerspectiveProjection(); } </code></pre>
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    1. POWriting a console within an application
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    1. COmay I ask how do you render this to the OpenGL window?
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    2. COI added the DrawConsole function to my answer above. Keep in mind that once again there is quite a bit of code that links to other places like my render class.
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