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  • How to launch a c program from another c program

    - by michael
    Hi, I have a c program which I can launch at command prompt. Is it possible for me the lunch this application in my another c program? If yes, how? All the google result shows me how to do that using pthread? Will that work? I suspect that I need a new process for my c program. Thank you.

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  • What is the equivalent of Java's .length for arrays in C#?

    - by Michael Loftus
    I'm new to C#, and I'm trying to convert this code from java into C#. static public double euclidean_2(double[] x, double[] y) { if (x.length != y.length) throw new RuntimeException("Arguments must have same number of dimensions."); double cumssq = 0.0; for (int i = 0; i < x.length; i++) cumssq += (x[i] - y[i]) * (x[i] - y[i]); return cumssq; } I know java uses .length but what is the equivalent in C# since I keep getting an error Thanks

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  • C++ Problem: Class Promotion using derived class

    - by Michael Fitzpatrick
    I have a class for Float32 that is derived from Float32_base class Float32_base { public: // Constructors Float32_base(float x) : value(x) {}; Float32_base(void) : value(0) {}; operator float32(void) {return value;}; Float32_base operator =(float x) {value = x; return *this;}; Float32_base operator +(float x) const { return value + x;}; protected: float value; } class Float32 : public Float32_base { public: float Tad() { return value + .01; } } int main() { Float32 x, y, z; x = 1; y = 2; // WILL NOT COMPILE! z = (x + y).Tad(); // COMPILES OK z = ((Float32)(x + y)).Tad(); } The issue is that the + operator returns a Float32_base and Tad() is not in that class. But 'x' and 'y' are Float32's. Is there a way that I can get the code in the first line to compile without having to resort to a typecast like I did on the next line?

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  • Combobox how to get the selected item to show a theme

    - by Michael Quiles
    I'm doing a tic tac toe game and I am trying to add a combo box that will change the applications background based on what the person selects right now I have summer, spring, fall, winter and the images are in the bin/debug folder how can I get this to work I don't know where to start and the tutorials are a bit confusing. Could you please help me

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  • Difference between two UIScrollView delegates

    - by Michael
    scrollViewDidEndScrollingAnimation and scrollViewDidEndDecelerating Looks like the last one is called when the bouncing effect is finished. But can't really understand what's the difference between first because they are called same time(well, decelerating called first).

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  • How do I show the selected item in an HTML <select> at the top

    - by Michael Meadows
    I have an HTML select that looks something like this (values are fake) <select size="40"> <option value="1">What would you do if I sang out of tune,</option> <option value="2">Would you stand up and walk out on me?</option> ... more <option value="156">Lend me your ears, and I'll sing you a song,</option> <option selected="selected" value="157">I will try not to sing out of key.</option> <option value="158">Oh, I get by with a little help from my friends.</option> ... more <option value="507">I get high with a little help from my friends.</option> <option value="509">Gonna' try with a little from my friends.</option> </select> The problem that I have is that when displaying the list after loading the page and the selected option is in the middle of the very long list, IE scrolls the selected option to the top of the list (which is what I want). Firefox, Chrome, Opera, and Safari show it at the bottom (which I don't want). I have to assume that IE is doing it wrong since everyone else shows it at the bottom. How can I force the browsers to display the selected item at the top of the list. I do not want to put it at the top of the list, I just want it to scroll such that the selected option is at the top. bonus, it would be even better if I can put it fourth from the top, but I can live without that if it's too difficult.

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  • How to only show simpleTip if certain conditions are true?

    - by Michael
    I'm working on my first jquery project and have a question regarding the simpletip plugin. I basically have a calendar where the user can click different meeting titles and the corresponding dates get shaded in with a certain color. I am then using the simpletip to display more detailed information about the meeting when the user hovers over that date. What I want is for the simpletip to only display if the cell is colored in, or "on". When the calendar is blank and no meetings are activated, I don't want all the simpletips to show. I have tried using an if statement with a .mouseover() - this works at first, when the cells are off, no simpletip. After the meeting is turned on and colored in, the first mouseover does nothing, then the second mouseover shows the simpletip, and then the simpletip remains active even after the cell is turned off. Hope this makes sense... please help! Thank you in advance

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  • Firefox DOMParser problem

    - by Michael
    For some reason DOMParser is adding some additional #text elements for each newline \n for this url http://rt.com/Root.rss ...as well as many other RSS I've tried. I checked cnn/bbc feeds, they don't have newlines and dom parser handling them nicely. So I have to add the following before parsing it var xmlText = htmlText.replace(/\n[ ]*/g, ""); var xmlDoc = parser.parseFromString(xmlText, "text/xml"); Server is returning text/xml. var channel = xmlDoc.documentElement.childNodes[0]; this returning \n without my code above and channel with correction.

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  • Jquery how to do image show hid.

    - by Michael
    I am new to html especially to jquery but I want to show hide a photo on click. I pulled some sample code which is exactly what I want "I did not write this code" and I am wanting to modify the code for an image versus a div. The code is noted below. I have tried this several different ways and the My goal: 1. To hide an image versus a div tag Any help would be wonderful <!DOCTYPE html> <html> <head> <style> div { background:#def3ca; margin:3px; width:80px; display:none; float:left; text-align:center; } </style> <script src="http://code.jquery.com/jquery-latest.js"></script> </head> <body> <button id="showr">Show</button> <button id="hidr">Hide</button> <div>Hello 3,</div> <div>how</div> <div>are</div> <div>you?</div> <script> $("#showr").click(function () { $("div:eq(0)").show("fast", function () { /* use callee so don't have to name the function */ $(this).next("div").show("fast", arguments.callee); }); }); $("#hidr").click(function () { $("div").hide(2000); }); </script> </body> </html> Show Hide Test

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  • how to get Horizontal menu go to left when it's too big

    - by Michael
    Hello all, I've got a horizontal menu on my website: http://www.alcmariavictrix.nl When i browse it in small browsers (IPhone), the horizontal menu on top is screwed. What i want to perform is get that horizontal menu to the left when the browser can't display it all in one line. Does anyone know how to do this? example:

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  • How to get horizontal menu to go to left when it's too big

    - by Michael
    Hello all, I've got a horizontal menu on my website: http://www.alcmariavictrix.nl When i browse it in small browsers (IPhone), the horizontal menu on top is screwed. What i want to perform is get that horizontal menu to the left when the browser can't display it all in one line. Does anyone know how to do this? example: The right way to do it This is the think i don't want This is how it should be done when it's wrong

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  • How to change the text of a div tag

    - by michael
    Hi, I have a simple div tag. Can you please tell me how can I change the text to 'mouse in' in my onmouseover handler? and 'mouse out' in my onmouseout handler? <div id="div1" onmouseover="alert(1);" width="100px" height="200px" border="1"> test </div> and why the width/height and border attributes do not work? I want to set the border to be 1 pixel with width = 100 pixels and height = 200 pixels. Thank you.

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  • GDI+ not clearing my window on repaint for vista

    - by Michael
    on WM_PAINT i do the following: //RectF mNameRect; //WCHAR* mName; //HWND mWin; // this is the window handle { PAINTSTRUCT ps; HDC hdc = BeginPaint(mWin, &ps); Graphics g(hdc); g.Clear(Color::White); StringFormat stringForm; stringForm.SetLineAlignment(StringAlignmentCenter); stringForm.SetAlignment(StringAlignmentCenter); // set the rectangle to the size of the whole window mNameRect.Width = static_cast<float>(size.cx); mNameRect.Height = static_cast<float>(size.cy); g.DrawString(mName, -1, &mNameFont, mNameRect, &stringForm, &mNameBrush); EndPaint(mWin, &ps); } In XP this works fine, the mName is displayed in the middle of the window. However on Vista the text doesn't move, it stays in its location no matter how I resize the window. the g.Clear(Color::White) doesn't seem to do any difference. The text doesn't even change position when the window is hidden behind another window and on focus needs to be repainted again. How do I make mName change position in Vista?

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  • javascript simple question

    - by Michael
    window.addEventListener('unload', function(e) { MyClass.shutdown(); window.removeEventListener('unload', /* how to reference the function itself here? */); }, false); The question in the comment.

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  • Error compiling basic java code

    - by Michael Younani
    New to java. Practicing coding by following a book. Heres my code: class Motorcycle { //Three instance variables - make and color are strings. while a boolean refers to TRUE OR FLASE(in this case off or on) String make; String color; boolean engineState; void startEngine() { if (engineState == true) System.out.print("The engine is already on."); else { engineState = true; System.out.print("The engine is now on."); } void showAtts() { System.out.print("This motorcycle is a " + color + " " + make); if (engineState ==true) System.out.print("The engine is on."); else System.out.print("The engine is off."); } } } When I compile I get 2 errors: 1) illegal start of expression 2) ; expected I can't pin point the problem. If anyone can direct me or hint me please do.

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  • Best way to run multiple queries per second on database, performance wise?

    - by Michael Joell
    I am currently using Java to insert and update data multiple times per second. Never having used databases with Java, I am not sure what is required, and how to get the best performance. I currently have a method for each type of query I need to do (for example, update a row in a database). I also have a method to create the database connection. Below is my simplified code. public static void addOneForUserInChannel(String channel, String username) throws SQLException { Connection dbConnection = null; PreparedStatement ps = null; String updateSQL = "UPDATE " + channel + "_count SET messages = messages + 1 WHERE username = ?"; try { dbConnection = getDBConnection(); ps = dbConnection.prepareStatement(updateSQL); ps.setString(1, username); ps.executeUpdate(); } catch(SQLException e) { System.out.println(e.getMessage()); } finally { if(ps != null) { ps.close(); } if(dbConnection != null) { dbConnection.close(); } } } And my DB connection private static Connection getDBConnection() { Connection dbConnection = null; try { Class.forName(DB_DRIVER); } catch (ClassNotFoundException e) { System.out.println(e.getMessage()); } try { dbConnection = DriverManager.getConnection(DB_CONNECTION, DB_USER,DB_PASSWORD); return dbConnection; } catch (SQLException e) { System.out.println(e.getMessage()); } return dbConnection; } This seems to be working fine for now, with about 1-2 queries per second, but I am worried that once I expand and it is running many more, I might have some issues. My questions: Is there a way to have a persistent database connection throughout the entire run time of the process? If so, should I do this? Are there any other optimizations that I should do to help with performance? Thanks

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  • MySQL: LOAD DATA reclaim disk space after delete

    - by Michael
    I have a DB schema composed of MYISAM tables, i am interested to delete old records from time to time from some of the tables. I know that delete does not reclaim the memory space, but as i found in a description of DELETE command, inserts may reuse the space deleted In MyISAM tables, deleted rows are maintained in a linked list and subsequent INSERT operations reuse old row positions. I am interested if LOAD DATA command also reuses the deleted space? UPDATE I am also interested how the index space reclaimed?

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