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• What's the environment variable for the path to the desktop?

  - by Scott Langham

  I'm writing a Windows batch file and want to copy something to the desktop. I think I can use this: %UserProfile%\Desktop\ However, I'm thinking, that's probably only going to work on an English OS. Is there a way I can do this in a batch file that will work on any internationalized version? UPDATE I tried the following batch file: REG QUERY "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders" /v Desktop FOR /F "usebackq tokens=3 skip=4" %%i in (`REG QUERY "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders" /v Desktop`) DO SET DESKTOPDIR=%%i FOR /F "usebackq delims=" %%i in (`ECHO %DESKTOPDIR%`) DO SET DESKTOPDIR=%%i ECHO %DESKTOPDIR% And got this output: S:\REG QUERY "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders" /v Desktop HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders Desktop REG_EXPAND_SZ %USERPROFILE%\Desktop S:\FOR /F "usebackq tokens=3 skip=4" %i in (`REG QUERY "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folder s" /v Desktop`) DO SET DESKTOPDIR=%i S:\FOR /F "usebackq delims=" %i in (`ECHO ECHO is on.`) DO SET DESKTOPDIR=%i S:\SET DESKTOPDIR=ECHO is on. S:\ECHO ECHO is on. ECHO is on.

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• Shutting down a WPF application from App.xaml.cs

  - by Johannes Rössel

  I am currently writing a WPF application which does command-line argument handling in App.xaml.cs (which is necessary because the Startup event seems to be the recommended way of getting at those arguments). Based on the arguments I want to exit the program at that point already which, as far as I know, should be done in WPF with Application.Current.Shutdown() or in this case (as I am in the current application object) probably also just this.Shutdown(). The only problem is that this doesn't seem to work right. I've stepped through with the debugger and code after the Shutdown() line still gets executed which leads to errors afterwards in the method, since I expected the application not to live that long. Also the main window (declared in the StartupUri attribute in XAML) still gets loaded. I've checked the documentation of that method and found nothing in the remarks that tell me that I shouldn't use it during Application.Startup or Application at all. So, what is the right way to exit the program at that point, i. e. the Startup event handler in an Application object?

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• How to generate a good random seed to pass to srand()?

  - by zr

  Hi, I am writing a C++ program which needs to create a temporary file for its internal usage. I would like to allow concurrent executions of the program by running multiple proccesses, so the temporary file name needs to be randomized, that way each spawned process will generate a unique temporary file name for its own use. I am using rand() to generate random characters for part of the file name, so i need to initialize the random number generator's seed using srand(). What options are there for passing a good argument to srand() such that two processes will not be initialized with the same seed value? My code needs to work both on Windows and pn Linux TIA.

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• Testing with Qt's QTestLib module

  - by ak

  Hi I started writing some tests with Qt's unit testing system. How do you usually organize the tests? It is one test class per one module class, or do you test the whole module with a single test class? Qt docs (or some podcast that I recently watched) suggested to follow the former strategy. I want to write tests for a module. The module provides only one class that is going to be used by the module user, but there is a lot of logic abstracted in other classes, which I would also like to test, besides testing the public class. The problem is that Qt's proposed way to run tests involved the QTEST_MAIN macro: QTEST_MAIN(TestClass) #include "test_class.moc" and eventually one test program is capable of testing just one test class. And it kinda sucks to create test projects for every single class in the module. Of course, one could take a look at the QTEST_MAIN macro, rewrite it, and run other test classes. But is there something, that works out of the box?

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• [MFC] Combining 2 memory DCs ?

  - by OverTheEdge

  I'm writing a control where there's a lot of custom drawing going through. Because of this I need to trim down the amount of "screen writes" that go about. Currently there is only one memory DC that is used to write to screen so as to avoid flicker when the control is redrawn. I want to know if it is a possiblity to use 2 or more memory DCs to write updates independently and then bitblt them to screen. This way the need to render non-changed parts of the screen is minimized. thanx in advacne, the_Saint

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• How do i return a StringWriter When I cant Clone it?

  - by acidzombie24

  My code looks like the below. Obviously i cant write 'ok' because the object has been disposed. I cant do return sw.Clone() bc clone doesnt exist. If i dont use a using then at any point between = new and return (like iterating and writing to the object as my example doesnt do) can have an exception and thus not disposing the object. Am i to define sw outside of a try block and check if its null then dispose in a catch block? That seems like a bit of excessive work. Is there a better way? is that the only way? static void func1() { using (var sw = func2()) { sw.WriteLine("Ok"); } } static StringWriter func2() { using (var sw = new StringWriter()) { return sw; } }

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• overlay text on some else's window - HUD

  - by taglius

  I am interested in writing an app that overlays a small heads up display (HUD) over another application, in VB.NET. Does anyone have an example of this? I will need to enumerate all open windows to find the window that I want, and then overlay some text in a specific position on the window. If the user moves that window, my text will need to follow. (I will probably be painting the text in a loop over and over). Edit: nobody answered my original query - I added C# to the keywords to see if any of gurus in that language might have an answer. thanks.

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• Program to call other programs

  - by Evil

  hello. I am writing a program that will solve a type of min. spanning tree problem. i have 2 different algorithms that I've gotten working in two separate .cpp files i've named kruskels.cpp and prims.cpp. my question is this: each file takes the following command line to run it . time ./FILENAME INPUTFILE FACTOR i would like to make a program that, depending on what inputfile is entered, will run either kruskels.cpp or prims.cpp. how can i do this? this program must pass those command line arguments to kruskels or prims. each file (kruskels.cpp and prims.cpp) are designed to be run using those command line arugments (so they take in INPUTFILE and FACTOR as variables to do file io). this should be for c++.

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• Insert query results into table in ms access 2010

  - by CodeMed

  I need to transform data from one schema into another in an MS Access database. This involves writing queries to select data from the old schema and then inserting the results of the queries into tables in the new schema. The below is an example of what I am trying to do. The SELECT component of the below works fine, but the INSERT component does not work. Can someone show me how to fix the below so that it effectively inserts the results of the SELECT statement into the destination table? INSERT INTO CompaniesTable (CompanyName) VALUES ( SELECT DISTINCT IIF(a.FIRM_NAME IS NULL, b.SUBACCOUNT_COMPANY_NAME, a.FIRM_NAME) AS CompanyName FROM (SELECT ContactID, FIRM_NAME, SUBACCOUNT_COMPANY_NAME FROM qrySummaryData) AS a LEFT JOIN (SELECT ContactID, FIRM_NAME, SUBACCOUNT_COMPANY_NAME FROM qrySummaryData) AS b ON a.ContactID = b.ContactID ); The definition of the target table (CompaniesTable) is: CompanyID Autonumber CompanyName Text Description Text WebSite Text Email Text TypeNumber Number

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• How do I truncate a .NET string?

  - by Steve Guidi

  I apologize for such a question that likely has a trivial solution, but I strangely could not find a concise API for this problem. Essentially, I would like to truncate a string such that it its length is not longer than a given value. I am writing to a database table and want to ensure that the values I write meet the constraint of the column's datatype. For instance, it would be nice if I could write the following: string NormalizeLength(string value, int maxLength) { return value.Substring(0, maxLength); } Unfortunately, this raises an exception because maxLength exceeds the string boundaries. Of course, I could write a function like the following, but I was hoping that something like this already exists. string NormalizeLength(string value, int maxLength) { return value.Length <= maxLength ? value : value.Substring(0, maxLength); } Where is the elusive API that performs this task? Is there one?

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• How do I manually log a user in with a MembershipProvider?

  - by Allen

  I'm experimenting with writing my own custom MembershipProvider in asp.net and I want to roll my own login page. We do some fairly special stuff at login time so we can't use the default login control so I need a way to manually log a user in. So far I haven't found anything on how to write your own login control so I'm here, wondering how I can manually log a user in via a MembershipProvider. I've tried Membership.ValidateUser("user", "pass"); and while that does call ValidateUser() on my custom MembershipProvider, and it does return true, it doesn't actually log me in. Btw I'm fairly new to the whole MembershipProvider stuff so if I'm not even on the right wavelength, feel free to let me know.

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• Is there a tool for detecting Visual Studio projects with duplicate GUIDs?

  - by sharptooth

  When creating new Visual Studio C++ projects there're two ways: either run the wizard and then painfully change all the necessary settings in the project or just copy and existing project, rename everything there and add files into it. The second variant is great except that the .vcproj file stores a project GUID. This GUID is used to track project dependencies and the startup project when two or more projects are in one solution. If any two projects in one solution have identical GUIDs problems can arise - dependencies are lost and the startup prject is reset on next solution reload. Clearly there's a need for a tool that would scan the filesystem subtree and detect projects with identical GUIDs here. Before I start writing one ... is there a ready tool for that?

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• What is a good method to use with multithreading to simulate this?

  - by user1504257

  I am writing a program in c++ in visual studio to be able to handle a line at a park. I have all of my customers in a line at the park and I want to be able to service them using multithreading with openmp. When I put the pragma and such in, I have multiple threads servicing the same customer at the same time for each and every customer I create, not what I want. I want for example, if I had two threads and four customers, that thread one to do customer one while thread 2 does customer 2. Then I would like thread 1 to do customer 3 and thread 2 customer 4 at the same time. I don't know if its possible or if there is a better way, but I need to use openmp. Thanks for your input.

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• Getting progress status out of a class library method

  - by Richard

  This app that I am doing uses a class library (if I dare call it that) to do the bulk of the work: 2 main methods in there (DoWork and UndoWork) use the other classes to achieve thier goal. Now that that works, I want to get out of the Console test enviroment and do a GUI. How would I get the status of say, the DoWork() method to update a progress bar? Should I multilate the class library (which currently works with the Console and Windows.Forms) to update? The problem with that is that I would surely have to make the class library use Window.Forms which will mess up the console testing apps (And there are lots of them - I tested all the way through, and then all together). Could you suggest some ideas, or places I can read up about ideas (the whole point of writing this this program is to learn, afer all)? Oh, by the way, suggestions like "foresight" or "planning" probably won't help here...(now, anywyay!) - But certainly will in future projects!

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• Is it magic or what ??

  - by STRIDER

  I am writing a big C code... The code includes recursive bactracking function named Branch() that is called so much... My goal is to write the fastest code to get the best running time... I also have another function Redundant() void Redundant() { int* A; A=(int*)malloc(100*sizeof(int)); } I created two versions. Version A: Redundant() is included in Branch(). Version B: Redundant() is not included in Branch() A run 10 times faster than B !!!! Is is Magic or is it kind of process scheduling or what ??

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• Moving between android activities on button clicks

  - by cppdev

  I am writing a android application where, on startup activity view, I have a button "DoIt". When user clicks "DoIt" button, I start another activity with different layout. On newly started activity, I have a button "Back" which should take me to the first activity. How to accomplish this. What code should I write on OnClick method of "Back" button. Also, I want the newly created activity to die after back button is pressed and application comes back to start-up activity.

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• How do I get Git's latest stable release version number?

  - by MattDiPasquale

  I'm writing a git-install.sh script: http://gist.github.com/419201 To get Git's latest stable release version number, I do: LSR_NUM=$(curl -silent http://git-scm.com/ | sed -n '/id="ver"/ s/.*v\([0-9].*\)<.*/\1/p') 2 Questions: Refactor my code: Is there a better way programmatically to do this? This works now, but it's brittle: if the web page at http://git-scm.com/ changes, the line above may stop working. PHP has a reliable URL for getting the latest release version: http://stackoverflow.com/questions/288206/is-there-a-site-which-simply-outputs-the-latest-stable-version-numbers-of-php-and Is there something like this for Git? This comes close: http://www.kernel.org/pub/software/scm/git/

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• Running out of label names in assembly

  - by mamidon

  Heyo, My class at college has us writing programs in assembly. I have never truly appreciated the ease of C until now. Now, when I program in assembly, I often have to make while/for/if loops and conditionals with labels eg: SKIP: ... COMP:ADD R1, R1, #0 ;Check for equality BRZ WHILEEND ... ;code inside the while loop JMP COMP ;Return to while loop WHILEEND: ... So, in this while loop (example) I have used 1 label for the subroutine and 2 more for the loop itself. I've run out of good label names for all the loops and branches I'm doing in assembly, what do you guys do to keep it varied and descriptive?

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• Howto write a class where a property can be accessed without naming it.

  - by SchlaWiener

  I have a (dump) question regarding VB/C# I often use third party classes where I can access a child object with only specifying the id or key. Example: Instead of writing: DataRow row = GetAPopulatedDataRowSomeWhere(); Object result = row.Items[1]; // DataRow has no Items property Object result = row.Items["colName"]; // Also not possible I use this code to access the members: DataRow row = GetAPopulatedDataRowSomeWhere(); Object result = row[1]; Object result = row["colName"]; Can someone tell me how a class has to look like to support this syntax? My own class has a Dictionary that I want to access this way. MyClass["key"]; // <- that's what I want MyClass.SubItems["key"]; // <- that's how I use it now

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• Using Excel To Read Access Without MS Access On Computer

  - by Tom Clark

  I have written code that joins two table in access, using criteria supplied from drop down lists in excel and then returns the data to a specific location on the spreadsheet (titles already on the sheet). This works fine on my box and others with MS Access on the machine, but the purpose of writing this was to give people (associates) that dont have the MS Access on their machines (which is most of them) to be able to do simple queries to the database. When we try to run this on a machine without MS Access, we are getting the error message "Compile Error: Cant find project or library." Since this works fine on any machine so far that has Access, but not the others I am wondering if this is not possible without the actual Access software. Any help or insight would be appreciated. Tom

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• database vs flat file, which is a faster structure for "regex" matching with many simultaneous reque

  - by Jamex

  Hi, which structure returns faster result and/or less taxing on the host server, flat file or database (mysql)? Assume many users (100 users) are simultaneously query the file/db. Searches involve pattern matching against a static file/db. File has 50,000 unique lines (same data type). There could be many matches. There is no writing to the file/db, just read. Is it possible to have a duplicate the file/db and write a logic switch to use the backup file/db if the main file is in use? Which language is best for the type of structure? Perl for flat and PHP for db? Addition info: If I want to find all the cities have the pattern "cis" in their names. Which is better/faster, using regex or string functions? Please recommend a strategy TIA

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• database vs flat file, which is a faster structure for regex matching with many simultaneous request

  - by Jamex

  Hi, which structure returns faster result and/or less taxing on the host server, flat file or database (mysql)? Assume many users (100 users) are simultaneously query the file/db. Searches involve pattern matching using regex against a static file/db. File has 50,000 unique lines (same data type). There could be many matches. There is no writing to the file/db, just read. Is it possible to have a duplicate the file/db and write a logic switch to use the backup file/db if the main file is in use? Which language is best for the type of structure? Perl for flat and PHP for db? TIA

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• git-diff in another directory

  - by ABach

  I'm currently writing a little zsh function that checks all of my git repositories to see if they're dirty or not and then prints out the ones that need a commit. Thus far, I've figured out that the quickest way to figure out a git repository's clean/dirty status is via git-diff and git-ls-files: if ! git diff --quiet || git ls-files --others --exclude-standard; then state=":dirty" fi I have two questions for you folks: Does anyone know of a quicker, more efficient way to check for file changes/additions in a git repo? I want my zsh function to be handed a file path (say ~/Code/git-repos/) and check all of the repositories in it. Is there a way to do without having to cd into each directory and run those commands? Something like git-diff --quiet --git-dir="~/Code/git-repos/..." would be fantastic. Thanks! :)

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• How can I draw a Rectangle on a PictureBox?

  - by TooFat

  I am trying to just draw a Rectangle on a PictureBox that is on a Form. Writing text like shown here works fine. private void pictureBox1_Paint(object sender, PaintEventArgs e) { using (Font myFont = new Font("Arial", 14)) { e.Graphics.DrawString("Hello .NET Guide!", myFont, Brushes.Green, new Point(2, 2)); } } but when I try to draw a rectangle like so nothing shows up. private void pictureBox1_Paint(object sender, PaintEventArgs e) { Rectangle rect = new Rectangle(); rect.Location = new Point(25, 25); rect.Width = 50; using (Pen pen = new Pen(Color.Red, 2)) { e.Graphics.DrawRectangle(pen, rect); } } What am I missing?

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• ASP.NET MVC 2: Deserialize SPROC Response

  - by dcolumbus

  I need to ask a general question. I don't have the code in front of me because I'm writing this on my iPhone. I have a Class that represents a certain XML schema. I have a SPROC that returns this XML. What I need to do is deserialize the XML to this Class. XML: <xml> <person> <firstName>Bob</firstName> <lastName>Robby</lastName> </person> </xml> I need to deserialize this XML into the custom Person Class so I can loop through this Model and spit it out in the View. I'm sure there's some kind of casting involved, I just don't know how to do it.

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