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• Winform not scrolling when drawing objects on it

  - by dezkev

  Hello All, C#3.0,.net framework 3.5 I am drawing ( using the draw method in the graphics class) a lot of solid rectangles on a windows form vertically. The form starts at 500 x 500 px and the rectangles are only drawn at runtime after data is downloaded from the net -and the number of rectangles depends on the download so I do not know it upfront. So only a few rectangles are drawn as the size of the form is fixed. So I googled/Binged ( lest someone suggest I do that) and found a few tips but they don't work in this case -like setting the forms AutoScroll property to true or trying double buffering.I also tried to draw on a listbox control and set it's scroll property etc...but no dice. I'm guessing there is no way to display , say 200 rectangles vertically on a windows form using draw. I need some other solution... any ideas please. Maybe a list of pictureboxes and then populate each picturebox with the solid color ? Thanks

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• Problem with array of elements of a structure type

  - by kobac

  I'm writing an app in Visual Studio C++ and I have problem with assigning values to the elements of the array, which is array of elements of structure type. Compiler is reporting syntax error for the assigning part of the code. Is it possible in anyway to assign elements of array which are of structure type? typedef struct { CString x; double y; } Point; Point p[3]; p[0] = {"first", 10.0}; p[1] = {"second", 20.0}; p[2] = {"third", 30.0};

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• How to debug/reformat C printf calls with lots of arguments in vim?

  - by Costi

  I have a function call in a program that I'm maintaining has 28 arguments for a printf call. It's printing a lot of data in a CSV file. I have problems following finding where what goes and I have some mismatches in the parameters types. I enabled -Wall in gcc and I get warnings like: n.c:495: warning: int format, pointer arg (arg 15) n.c:495: warning: format argument is not a pointer (arg 16) n.c:495: warning: double format, pointer arg (arg 23) The function is like this: fprintf (ConvFilePtr, "\"FORMAT3\"%s%04d%s%04d%s%s%s%d%s%c%s%d%c%s%s%s%s%s%s%s%11.lf%s%11.lf%s%11.lf%s%d\n", some_28_arguments_go_here); I would like to know if there is a vim plugin that highlights the printf format specifier when i go with the cursor over a variable. Other solutions? How to better reformat the code to make it more readable?

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• Python and hebrew encoding/decoding error

  - by user340495

  Hey, I have sqlite database which I would like to insert values in Hebrew to I am keep getting the following error : UnicodeDecodeError: 'ascii' codec can't decode byte 0xd7 in position 0: ordinal not in range(128) my code is as following : runsql(u'INSERT into personal values(%(ID)d,%(name)s)' % {'ID':1,'name':fabricate_hebrew_name()}) def fabricate_hebrew_name(): hebrew_names = [u'????',u'???',u'???',u'???',u'????',u'???',u'????',u'???',u'????',u'?????',u'????',u'???',u'????'] return random.sample(names,1)[0].encode('utf-8') note: runsql executing the query on the sqlite database fabricate_hebrew_name() should return a string which could be used in my SQL query. any help is much appreciated.

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• Mscorcfg.msc .net Configuration Tools problem

  - by vijay shiyani

  I'm trying to run Microsoft's .NET Framework Configuration Tool (Mscorcfg.msc). I have Visual Studio 2008 installed. I also have the following installed on my PC: Microsoft .Net Framework v1.0.3705 Microsoft .Net Framework 2.0 Service Pack 2 Microsoft .Net Framework 3.0 Service Pack 2 Microsoft .Net Framework 3.5 SP1 Microsoft .Net Framework v4.0.30319 I'm not sure why, but I can't start "Mscorcfg.msc" the usual way (as suggested in the http://msdn.microsoft.com/en-us/library/2bc0cxhc(VS.80).aspx and http://msdn.microsoft.com/en-us/library/2bc0cxhc.aspx URL). I looked for "Mscorcfg.msc" on my PC and found only 1 occurence (in the C:\WINDOWS\ServicePackFiles\i386 folder). When I double-click on the .msc file in Windows Explorer, I get the "MMC could not create the snap-in." message. What should I do ? Thanks

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• JSON DATA formatting in WebAPI

  - by user1736299

  public class CalendarController : ApiController { Events[] events = new Events[] { new Events { title= "event1", start = System.DateTime.UtcNow, end = System.DateTime.UtcNow }, new Events { title= "event2", start = System.DateTime.UtcNow, end = System.DateTime.UtcNow }, new Events { title= "event3", start = System.DateTime.UtcNow, end = System.DateTime.UtcNow} }; public IEnumerable<Events> GetAllCalendar() { return events; } The JSON result for the above is [{ "title": "event1", "start": "2012-12-05T22:52:35.6471712Z", "end": "2012-12-05T22:52:35.6471712Z"}, { "title": "event2", "start": "2012-12-05T22:52:35.6471712Z", "end": "2012-12-05T22:52:35.6471712Z"}, { "title": "event3", "start": "2012-12-05T22:52:35.6471712Z", "end": "2012-12-05T22:52:35.6471712Z" }]? How to create the same JSON result without the double quotes but single quote. How to get the date in the format of ‘YYYY-MM-DD HH:MM:SS’ Thank you, Smith

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• Which header files are necessary to run this code snippet?

  - by httpinterpret

  It's from here,but fails when compiling: int main(int argc, char **argv) { struct hostent { char *h_name; // main name char **h_aliases; // alternative names (aliases) int h_addrtype; // address type (usually AF_INET) int h_length; // length of address (in octets) char **h_addr_list; // alternate addresses (in Network Byte Order) }; #define h_addr h_addr_list[0] // First address of h_addr_list. struct hostent *info_stackoverflow; int i = 0; info_stackoverflow = gethostbyname( "www.stackoverflow.com" ); printf("The IP address of %s is %s", info_stackoverflow->h_name, inet_ntoa( * ((struct in_addr *)info_stackoverflow->h_addr ))); /* aliases */ while( *(pc_ip->h_aliases + i) != NULL ) { printf("\n\tAlias: %s", *(pc_ip->h_aliases + i) ); i++; } }

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• Escape doube and single backslashes in a string in Ruby

  - by Nick Gorbikoff

  Hello. I'm trying to access a network path in my ruby script on a windows platform in a format like this. \\servername\some windows share\folder 1\folder2\ Now If I try to use this as a path, it won't work. Single backslashes are not properly escaped for this script. path = "\\servername\some windows share\folder 1\folder2\" d = Dir.new(path) I tried everything I could think of to properly escape slashes in the path. However I can't escape that single backslash - because of it's special meaning. I tried single quotes, double quotes, escaping backslash itself, using alternate quotes such as %Q{} or %q{}, using ascii to char conversion. Nothing works in a sense that I'm not doing it right. :-) Right now the temp solution is to Map a network drive N:\ pointing to that path and access it that way, but that not a solution. Does anyone have any idea how to properly escape single backslashes? Thank you

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• MySQL import in phpmyadmin (CSV) chokes on quotes

  - by Andrew Swift

  I am trying to import a .csv file into a MySQL table via phpMyAdmin. The .csv file is separated by pipes, formated like this: data|d'ata|d'a"ta|dat"a| data|"da"ta|data|da't'a| dat'a|data|da"ta"|da'ta| The data contains quotes. I have no control over the format in which I recieve the data -- it is generated by a third party. The problem comes when there is a | followed by a double quote. I always get an "invalid field count in CSV input on line N" error. I am uploading the file from the import page, using Latin1, CSV, terminated by |, separated by ". I would like to just change the "enclosed by" character, but I keep getting "Invalid parameter for CSV import: Fields enclosed by". I have tried various characters with no success. How can I tell MySQL to accept this format in phpMyAdmin? Setting up these tables is the first step in writing a program that will use uploaded gzipped .csv files to maintain the catalog of an e-commerce site.

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• Syntax error in SharePoint calculated column formula

  - by Jan Aagaard

  Is it possible to debug SharePoint calculated column formulas? I am trying with a really simple SharePoint calculated formula =IF([YTD]<[Budget], "OK", "Not OK"). This being a Danish installations of SharePoint I believe the fomula should look like this: =HVIS([YTD]<=[Budget]; "OK"; "Not OK") But this just leaves with the same syntax error or not supported error. I have tried all combinations of IF/HVIS, with/without the square brackets, comma/semicolon, single quotes/double quotes, but nothing works. The formula =YTD<=Budget works.

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• How secure are GUIDs in terms of predictability?

  - by ssg

  We're using .NET's Guid.NewGuid() to generate activation codes and API keys currently. I wonder if that poses a security problem since their algorithm is open. .NET Guid uses Win32 CoCreateGuid and I don't know it's internals (possibly MAC address + timestamp?). Can someone derive a second GUID out of the first one, or can he hit it with some smart guesses or is the randomness good enough so search space becomes too big? Generating random keys have the problem of collision, they need a double check before adding to a database. That's why we stuck with GUIDs but I'm unsure about their security for these purposes. Here are the 4 consecutive UUIDGEN outputs: c44dc549-5d92-4330-b451-b29a87848993 d56d4c8d-bfba-4b95-8332-e86d7f204c1c 63cdf958-9d5a-4b63-ae65-74e4237888ea 6fd09369-0fbd-456d-9c06-27fef4c8eca5 Here are 4 of them by Guid.NewGuid(): 0652b193-64c6-4c5e-ad06-9990e1ee3791 374b6313-34a0-4c28-b336-bb2ecd879d0f 3c5a345f-3865-4420-a62c-1cdfd2defed9 5b09d7dc-8546-4ccf-9c85-de0bf4f43bf0

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• C# implicit conversions and == operator

  - by Arnis L.

  Some code for context: class a { } class b { public a a{get;set;} public static implicit operator a(b b) { return b.a; } } a a=null; b b=null; a = b; //compiler: cannot apply operator '==' to operands of type tralala... bool c = a == b; Is it possible to use == operator on different type instances, where one can implicitly convert to another? What did i miss? Edit: If types must be the same calling ==, then why int a=1; double b=1; bool c=a==b; works?

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• Insriting into a bitstream

  - by evilertoaster

  I'm looking for a way to efficiently insert bits into a bitstream and have it 'overflow', padding with 0's. So for example if you had a byte array with 2 bytes: 231 and 109 (11100111 01101101), and did BitInsert(byteArray,4,00) it would insert two bits at bit offset 4 making 11100001 11011011 01000000 (225,219,24). It would be ok even the method only allowed 1 bit insertions e.g. BitInsert(byteArray,4,true) or BitInsert(byteArray,4,false). I have one method of doing it, but it has to walk the stream with a bitmask bit by bit, so I'm wondering if there's a simpler approach... Answers in assembly or a C derivative would be appreciated.

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• Adding Message Part dynamically in Receive Pipeline

  - by Sean

  Hello, I tried to create a custom pipeline component that takes a message and attaches additional another part dynamically (during Disassemble stage). I haven't set up a send port, so that I can see what BizTalk is trying to process. I can see only the body part, the additional part doesn't show up. This is the code I used: var part = pc.GetMessageFactory().CreateMessagePart(); part.Data = new MemoryStream(new byte[] {1, 2, 3, 4, 5}); inmsg.AddPart("another_part", part, false); Thank you.

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• C inline assembly of x96 fbstp instruction

  - by David HUnter

  Was wondering how to inline a usage of fbstp on a 32 bit I86 architecture. I tried something like int main( ) { double foo = 100.0; long bar = 0; asm( "pushl %1; fbstp %0" : "=m"(bar) : "r"(foo) ); ... But bar is unchanged. I have tried reading everything I can find on this but most example simply do things like add two integers together. I can’t find any that talk about pushing operands onto the stack and what I should be doing when an instruction like fbstp writes 80 bits of data back to memory ( i.e. what C type to use ) and how to specify it in the asm syntax. Also on x86-64 there seems to be a pushq and no pushl but fbstp still exists whereas fbstq does not. Is there some other magic for 64 bit.

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• File Encrypt/Decrypt under load?

  - by chopps

  I found an interesting article about encrypting and decrypting files but since it uses a file.dat to store the key this will run into problems when theres alot of users on the site dealing with alot of files. http://www.codeproject.com/KB/security/VernamEncryption.aspx?display=Print Should a new file be created every time a file needs decrypting or would there be a better way to do this? UPDATE: Here is what im using to avoid the locking problems. using (Mutex FileLock = new Mutex(true, System.Guid.NewGuid().ToString())) { try { FileLock.WaitOne(); using (FileStream fs = new FileStream(keyFile, FileMode.Open)) { keyBytes = new byte[fs.Length]; fs.Read(keyBytes, 0, keyBytes.Length); } } catch (Exception ex) { EventLog.LogEvent(ex); } finally { FileLock.ReleaseMutex(); } } I tested it on 1000 TIFFs doing both encryption and decryption without any errors.

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• What C# data types can be nullable types?

  - by Randy Minder

  Can someone give me a list, or point me to where I can find a list of C# data types that can be a nullable type? For example: I know that Nullable<int> is ok I know that Nullable<byte[]> is not. I'd like to know which types are nullable and which are not. BTW, I know I can test for this at runtime. However, this is for a code generator we're writing, so I don't have an actual type. I just know that a column is "string" or "int32" etc. Thanks.

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• C# Event Handlers automatically created by WinForms Designer

  - by RHaguiuda

  Just moved from VB.NET to C#. In VB to connect and Event Handler to a Sub we use the Handles clause. From what it seems, this do not exist in C#. After creating a simple application with a button I realize that Window Forms Designer automatically created an EventHandler to my button1_Click function (after I double clicked it), in Form1.Designer.cs with this code: this.button1.Click += new System.EventHandler(this.button1_Click); But, in VB, the WinForms Designer create the Handles clause in my class, in the function header. So, C# create the default EventHandler in designer file, while VB creates in main class with control resides. Is this correct? Am I missing something here?

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• Is this casting safe?

  - by Itsik

  I need to write a Util function (in my c++cli app) that converts a String to a Double or Float or Int. template<typename T> static T MyConvert(String^ str) { return static_cast<T>(System::Convert::ToDouble(str)); } Is this safe? Can it somehow convert 2 to 1.999 and then to 1 if I call MyConvert<int>("2") ? I was wondering why the Convert class isn't templated in the first place? (That would let me call Convert<T> instead of Convert.ToDouble() for all types) This is C++/Cli so I can use any convert methods in c++ or .net, but I only know Convert.ToDouble()|ToString()|ToInt32()) Thanks

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• Unescpaing huge single-line string on Linux

  - by Lajos Nagy

  I ended up with a huge, single line string literal (don't ask me how) where everything is escaped (mostly), including new lines and double quotes. Problem is, I want the original string. The string is huge so I'm not even sure how to begin. Here's what I have: "This\n is \"nice\",\nain\'t it?" This is what I want: This is "nice", ain't it? Again, the problem is that other shell sensitive stuff is not escaped (like $, or !), and that the string is couple of megabytes.

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• C# dealing with invalid user input

  - by Zka

  Have a simple console app where user is asked for several values to input. Input is read via console.readline(). Ex Name: Fred //string Lastname: Ashcloud //string Age: 28 //int I would like to make sure that int and double types are entered and if the user enters garbage, lets him repeat the procedure. Example, if the user enters "28 years old" where age expects int the app will crash. What is the best way to check for these inputs? Right now I can only think of: while (!Int32.TryParse(text, out number)) { Console.WriteLine("Error write only numbers"); text = Console.ReadLine(); } Is there any other way to do this? try catch statements if one wants to give a more detailed feedback to the user? How in that case?

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• Oracle Unique Indexes

  - by Melvin

  I was creating a new table today in 10g when I noticed an interesting behavior. Here is an example of what I did: CREATE TABLE test_table ( field_1 INTEGER PRIMARY KEY ); Oracle will by default, create a non-null unique index for the primary key. I double checked this. After a quick check, I find a unique index name SYS_C0065645. Everything is working as expected so far. Now I did this: CREATE TABLE test_table ( field_1 INTEGER, CONSTRAINT pk_test_table PRIMARY KEY (field_1) USING INDEX (CREATE INDEX idx_test_table_00 ON test_table (field_1))); After describing my newly created index idx_test_table_00, I see that it is non-unique. I tried to insert duplicate data into the table and was stopped by the primary key constraint, proving that the functionality has not been affected. It seems strange to me that Oracle would allow a non-unique index to be used for a primary key constraint. Why is this allowed?

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• PHP Error, is it resolvable, or a language bug?

  - by rls

  Given the following code $c= new SoapClient('http://www.webservicex.net/CurrencyConvertor.asmx?WSDL'); $usa = "USD"; $eng = "GBP"; doing a __getTypes on the client gives me Array ( [0] => struct ConversionRate { Currency FromCurrency; Currency ToCurrency; } [1] => string Currency [2] => struct ConversionRateResponse { double ConversionRateResult; } ) if i then do $calculation = $c->ConversionRate($usa, $eng); and print calculation i get an error about Catchable fatal error: Object of class stdClass could not be converted to string Is there a specific way i should be printing this out, or i it a bug, from researching / googling many people seem to have a problem but i cant find a suitbale solution, other than downgrading php, which isnt a solution for me as i am doing this as homework and its running off of a college server

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• Error: Unable to access jarfile Click-The-Block.jar

  - by AqueousSnake

  I have made a simple game that I want to convert into a runnable jar so I can show others and launch it without Eclipse. In Eclipse I: Right clicked on Project Export Java Exectuable Jar File Launch Configuration: CTB (1) - Click The Block It made a jar with a MANIFEST.MF containing: Manifest-Version: 1.0 Class-Path: . Main-Class: uk.co.robertmerriman.ctb.main.CTB This was all extracted to my desktop in Click-The-Block.jar When I double click, nothing happens. When I type "java -jar Click-The-Block.jar" into CMD, I get the following error: Error: Unable to access jarfile Click-The-Block.jar.

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• Integers in JavaScript

  - by muntoo

  I'm a beginner to Javascript so forgive me if I sound dumb because I learned some Javascript from W3Fools (which are really difficult tutorials - they don't explain anything I want to know, but everything I probably can guess from my experience with C++). I may be switching over to MDN, but if you can recommend any other tutorials, that be great. Anyways, so here's my question: I just read a few lines of this, and apparently: Numbers in JavaScript are "double-precision 64-bit format IEEE 754 values", according to the spec. This has some interesting consequences. There's no such thing as an integer in JavaScript, so you have to be a little careful with your arithmetic if you're used to math in C or Java. I've already seen that there are few of the data types (for variables) I'm used to from C++. But I didn't expect all numbers to automatically be floats. Isn't there any way to use integers, not float? Will a future version of JavaScript support ints?

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