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• Casting problem cant convert from void to float C++

  - by Makenshi

  as i said i get this horrible error i dont really know what to do anymore float n= xAxis[i].Normalize(); thats where i get the error and i get it cuz normalize is a void function this is it void CVector::normalize() { float len=Magnitude(); this->x /= len; this->y /= len; } i need normalize to stay as void tho i tried normal casting like this float n= (float)xAxis[i].Normalize(); and it doesnt work also with static,dynamic cast,reinterpret,const cast and cant make it work any help would be really apreciated... thank you .<

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• Leak caused by fread

  - by Jack

  I'm profiling code of a game I wrote and I'm wondering how it is possible that the following snippet causes an heap increase of 4kb (I'm profiling with Heapshot Analysis of Xcode) every time it is executed: u8 WorldManager::versionOfMap(FILE *file) { char magic[4]; u8 version; fread(magic, 4, 1, file); <-- this is the line fread(&version,1,1,file); fseek(file, 0, SEEK_SET); return version; } According to the profiler the highlighted line allocates 4.00Kb of memory with a malloc every time the function is called, memory which is never released. This thing seems to happen with other calls to fread around the code, but this was the most eclatant one. Is there anything trivial I'm missing? Is it something internal I shouldn't care about? Just as a note: I'm profiling it on an iPhone and it's compiled as release (-O2).

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• How to create a string array in matlab?

  - by aduric

  I would like to pass a vector of strings from C++ to matlab. I have tried using the functions available such as mxCreateCharMatrixFromStrings but it doesn't give me the correct behavior. So, I have something like this: void mexFunction( int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]) { vector<string> stringVector; stringVector.push_back("string 1"); stringVector.push_back("string 2"); //etc... The problem is how do I get this vector to the matlab environment? plhs[0] = ??? My goal is to be able to run: >> [strings] = MyFunc(...) >> strings(1) = 'string 1'

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• Vbscript - Object Required for DateLastModified

  - by Kenny Bones

  I don't really know what's wrong right here. I'm trying to create a vbscript that basically checks two Folders for their files and compare the DateLastModified attribute of each and then copies the source files to the destination folder if the DateLastModified of the source file is newer than the existing one. I have this code: Dim strSourceFolder, strDestFolder Dim fso, objFolder, colFiles strSourceFolder = "c:\users\user\desktop\Source\" strDestFolder = "c:\users\user\desktop\Dest\" Set fso = CreateObject("Scripting.FileSystemObject") Set objFolder = fso.GetFolder(strSourceFolder) Set colFiles = objFolder.Files For each objFile in colFiles Dim DateModified DateModified = objFile.DateLastModified ReplaceIfNewer objFile, DateModified, strSourceFolder, strDestFolder Next Sub ReplaceIfNewer (sourceFile, DateModified, SourceFolder, DestFolder) Const OVERWRITE_EXISTING = True Dim fso, objFolder, colFiles, sourceFileName, destFileName Dim DestDateModified, objDestFile Set fso = CreateObject("Scripting.FileSystemObject") sourceFileName = fso.GetFileName(sourceFile) destFileName = DestFolder & sourceFileName if fso.FileExists(destFileName) Then objDestFile = fso.GetFile(destFileName) DestDateModified = objDestFile.DateLastModified msgbox "File last modified: " & DateModified msgbox "New file last modified: " & DestDateModified End if End Sub And I get the error: On line 34, Char 3 "Object required: 'objDestFile' But objDestFile IS created?

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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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• Error in IE8 Browser -> Message: Object doesn't support this property or method

  - by tibin mathew

  Hi All, In my joomla project(http://crystalwrightlive.com) home page there is one sliding banner section, but this banner not working in IE browser (working fine in FF browser) and showing following error: Webpage error details User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB6; InfoPath.2) Timestamp: Sat, 8 May 2010 06:42:15 UTC Message: Object doesn't support this property or method Line: 1 Char: 1 Code: 0 URI: http://crystalwrightlive.com/index.php In index page included a jquery file: http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js when i removed this JS file, no error but this JQuery file needed for this sliding banner. How can i fix this issue, Please anyone help me!!!!

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• Problems with delete in destructor

  - by Vera

  Hello, I wrote this code. The constructor works normally, but in the destructor I get "Windows has triggered a breakpoint." How should I correct this? template class CyclicalArray { private: T* mem_ptr; public: CyclicalArray(size_t capacity, const T& default_value) { this->default_value = default_value; this->capacity = capacity; head_index = 0; mem_ptr = ::new T[capacity]; //memory allocating for(T* p = mem_ptr; p < mem_ptr + capacity * sizeof(T); p += sizeof(T)) { ::new (p) T (default_value); //initialization } } ~CyclicalArray() { for(T* p = mem_ptr + sizeof(T); p < mem_ptr + capacity * sizeof(T); p += sizeof(T)) { p->~T(); } delete[] mem_ptr; }

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• JQuery Autocomplete - Stop mouseover+Return submitting data

  - by ILT

  I'm using JQuery Autocomplete (bassistance) and have run into a problem. If the mouse rolls over one of the autocomplete suggestions and the user hits the return key (rather than clicking to make selection), the form is submitted and goes to whatever link was rolled over at the time. This is a problem as people click in the textbox, and when typing their search, leave the pointer where the autocomplete popup appears. So when they hit enter, it doesn't do the search for whatever they typed in the box but whatever was highlighted in the autocomplete suggestions. Is there a way to stop this? Using Google as the functionality I'm after... So just to clarify - I want selections via mouse and keyboard to go to the same place, but if the UP or DOWN arrow has not been pressed (user not selected an autocomplete option via the keyword), dont go to the URL specified in the autosuggest - instead submit the form (traditional method without JQuery) based on what has been typed in the textbox. I hope I'm explaining this clearly? :S

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• Unknown symbols when I read file

  - by Sergey Gavruk

  I read file, but in the end of file i get unknown symbols: int main() { char *buffer, ch; int i = 0, size; FILE *fp = fopen("file.txt", "r"); if(!fp){ printf("File not found!\n"); exit(1); } fseek(fp, 0, SEEK_END); size = ftell(fp); printf("%d\n", size); fseek(fp, 0, SEEK_SET); buffer = malloc(size * sizeof(*buffer)); while(((ch = fgetc(fp)) != NULL) && (i <= size)){ buffer[i++] = ch; } printf(buffer); fclose(fp); free(buffer); getch(); return 0; }

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• Zend Framework Custom Validation Class Error Message

  - by remlabm

  The validation fails as it should but does not return the error message. $form->addElement('text', 'phone_number', array( 'required' => true, 'validators' => array( array('NotEmpty', true, array('messages' => 'Enter a valid Phone Number')), array('regex', false, array('pattern' => '/\([0-9]{3}\)\s[0-9]{3}-[0-9]{4}/', 'messages' => 'Enter a valid Phone Number' )), 'CheckPhoneNumber'), ), )); Custom Class: class Custom_Validators_CheckPhoneNumber extends Zend_Validate_Abstract{ const IN_USE = 'inUse'; protected $_messageTemplates = array( self::IN_USE => "'%value%' is currently in use" ); public function isValid($value) { $this->_setValue($value); $user_check = Users::getActive(preg_replace("/[^0-9]/", "", $value)); if($user_check->id){ $this->_error(self::IN_USE); return false; } return true; } } Just fails does not give the "IN_USE" error.

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• Django sys.path.append for project *and* app needed under WSGI

  - by GerardJP

  Hi all, Could somebody give me a pointer on why I need to add my project root path to the python path as well as the application itself in my WSGI file? Project base is called 'djapp', the application is called 'myapp'. sys.path.append(os.path.dirname(os.path.abspath(__file__)) + '/..') sys.path.append(os.path.dirname(os.path.abspath(__file__)) + '/../djapp') os.environ['DJANGO_SETTINGS_MODULE'] = 'djapp.settings' If I omit the line with "/../djapp/" the log tells my that 'myapp' can not be imported, even though 'djapp.settings' is. (validating 'djapp' was imported) It al runs properly with the ./manage.py command. there's a __init__ in the project folder. For testings sake, I see the same issue using addsitedir: site.addsitedir('/home/user/web/project/') site.addsitedir('/home/user/web/project/djapp') Thanx a lot. Gerard.

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• iOS: How to access the `UIKeyboard`?

  - by MattDiPasquale

  I want to get a pointer reference to UIKeyboard *keyboard to the keyboard on screen so that I can add a transparent subview to it, covering it completely, to achieve the effect of disabling the UIKeyboard without hiding it. In doing this, can I assume that there's only one UIKeyboard on the screen at a time? I.e., is it a singleton? Where's the method [UIKeyboard sharedInstance]. Brownie points if you implement that method via a category. Or, even more brownie points if you convince me why it's a bad idea to assume only one keyboard and give me a better solution.

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• Why my print current date time (C language) gives different answer

  - by vodkhang

  I want to get the current date (day, mon and year). I found out there are some functions in C to do that like ctime (get the string of time), localtime and gmtime. I tried with following code but the output are different. I get this output: The date and time is Tue Apr 20 2010 (which is correct) The year is : 110 The year is : 110. Does anybody know why? int main(int argc, char** argv) { time_t now; if((now = time(NULL)) == (time_t)-1) { puts("Failure in getting time"); } else { printf("The date and time is: %s\n", ctime(&now)); printf("The year is: %ld\n", localtime(&now)->tm_year); printf("The year is: %ld\n", gmtime(&now)->tm_year); } getchar(); }

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• Windows debugging - WinDbg

  - by Santhosh77

  Hi, I got the following error while debuggging a process with its core dump. 0:000 !lmi test.exe Loaded Module Info: [test.exe] Module: test Base Address: 00400000 Image Name: test.exe Machine Type: 332 (I386) Time Stamp: 4a3a38ec Thu Jun 18 07:54:04 2009 Size: 27000 CheckSum: 54c30 Characteristics: 10f Debug Data Dirs: Type Size VA Pointer MISC 110, 0, 21000 [Debug data not mapped] FPO 50, 0, 21110 [Debug data not mapped] CODEVIEW 31820, 0, 21160 [Debug data not mapped] - Can't validate symbols, if present. Image Type: FILE - Image read successfully from debugger. test.exe Symbol Type: CV - Symbols loaded successfully from image path. Load Report: cv symbols & lines Does any body know what the error "CODEVIEW 31820, 0, 21160 [Debug data not mapped] - Can't validate symbols, if present." really mean? Is this error meant that i can't read public/private symbols from the executable? If it is not so, why does the WinDbg debugger throws this typr of error? Thanks in advance, Santhosh.

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• Multiple constructors definitions with same name but different signatures (C++)

  - by PuRe_ChAoS12

  With the following code, I keep getting error C2535 when I compile. It's complaining that a member function already defined or declared. Rationnel.h ... class Rationnel { public: Rationnel(int); //Constructor Rationnel(int,int); //Constructor void add(const Rationnel); ... Rationnel.cpp ... //Constructor Rationnel::Rationnel(int n = 1) { numerateur = n; denominateur = 1; } //Constructor Rationnel::Rationnel(int n = 1, int d = 1) { numerateur = n; denominateur = d; } ... Any idea what could be causing the error? Thanks for your time.

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• MinGW screw up with COLORREF and RGB

  - by kjoppy

  I am trying to build a 3rd party open source project using MinGW. One of the dependencies is wxWidgets. When I try to make the project from MSYS I get a compiler error from /MinGW/msys/1.0/local/include/wx-2.8/wx/msw/private.h In function 'COLORREF wxColourToRGB(const wxColour&)': error: cannot convert 'RGB' to 'COLORREF {aka long unsigned in}' in return This is somewhat odd given that, according to Microsoft the RGB macro returns a COLORREF. In fact, looking in H:\MinGW\include I find wingdi.h with the following code #define RGB(r,g,b) ((COLORREF)((BYTE)(r)|((BYTE)(g) << 8)|((BYTE)(b) << 16))) What sort of thing would cause this error? Is there some way I can check to see if COLORREF and RGB are being included from wingdi.h and not somewhere else? Is that even worth checking? Specifications GCC version 4.7.2 wxWidgets version 2.8.12 (I'm new to C++ and MinGW specifically but generally computer and programming literate)

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• remote function with pthread

  - by user311130

  Hi all, I wrote some code in c, using pthread (I configured the linker and compiler in eclipse IDE first). #include <pthread.h> #include "starter.h" #include "UI.h" Page* MM; Page* Disk; PCB* all_pcb_array; void* display_prompt(void *id){ printf("Hello111\n"); return NULL; } int main(int argc, char** argv) { printf("Hello\n"); pthread_t *thread = (pthread_t*) malloc (sizeof(pthread_t)); pthread_create(thread, NULL, display_prompt, NULL); printf("Hello\n"); return 1; } that works fine. However, when I move display_prompt to UI.h no "Hello111 " output is printed. anyone know how to solve that? Elad

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• Avoiding "variable might not have been initialized"

  - by Mason Wheeler

  I recently ran across a routine that looks something like this: procedure TMyForm.DoSomething(list: TList<TMyObject>; const flag: boolean); var local: integer; begin if flag then //do something else local := ExpensiveFunctionCallThatCalculatesSomething; //do something else for i := 0 to list.Count do if flag then //do something else if list[i].IntValue > local then //WARNING HERE //do something else end; This gives Variable 'local' might not have been initialized even though you can tell by reading the code that you won't hit that line unless the code branch that initializes it has run. Now, I could get rid of this warning by adding a useless local := 0; at the top of the procedure, but I wonder if there might not be a better way to structure this to avoid the issue. Anyone have any ideas?

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• For Qt 4.6.x, how to auto-size text to fit in a specified width?

  - by darenchow

  Inside of my QGraphicsRectItem::paint(), I am trying to draw the name of the item within its rect(). However, for each of the different items, they can be of variable width and similarly names can be of variable length. Currently I am starting with a maximum font size, checking if it fits and decrementing it until I find a font size that fits. So far, I haven't been able to find a quick and easy way to do this. Is there a better, or more efficient way to do this? Thanks! void checkFontSize(QPainter *painter, const QString& name) { // check the font size - need a better algorithm... this could take awhile while (painter->fontMetrics().width(name) > rect().width()) { int newsize = painter->font().pointSize() - 1; painter->setFont(QFont(painter->font().family(), newsize)); } }

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• translate ia32 into C

  - by David Lee

  I am trying to translate the following: Action: push %ebp #function prolog mov %esp, %ebp sub $0x10, %esp mov 0x8(%ebp), %eax #first line compiles to these 4 lines imul 0x8(%ebp), %eax sub $0x7, %eax mov %eax, -0x4(%ebp) addl $0x8, 0xc(%ebp) #second line mov -0x4(%ebp), %eax #third line mov 0xc(%ebp), %edx mov (%edx, %eax, 4), %eax add $0x3, %eax movb $0x41, (%eax) leave ret So far I have the following: //What am I missing? void Action(int x, char **y) { int z = x * x - 7; y+=8; //missing third line } What is the best way to translate this?

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• How do I make a class whose interface matches double, but upon which templates can be specialized?

  - by Neil G

  How do I make a class whose interface matches double, but whose templated types do not dynamic cast to double? The reason is that I have a run-time type system, and I want to be able to have a type that works just like double: template<int min_value, int max_value> class BoundedDouble: public double {}; And then inherit use template specialization to get run-time information about that type: template<typename T> class Type { etc. } template<int min_value, int max_value> class Type<BoundedDouble<min_value, max_value>> { int min() const { return min_value; } etc. } But, you can't inherit from double...

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• snprintf and Visual Studio 2010

  - by Andrew

  I'm unfortunate enough to be stuck using VS 2010 for a project, and noticed the following code still doesn't build using the non-standards compliant compiler: #include <stdio.h> #include <stdlib.h> int main (void) { char buffer[512]; snprintf(buffer, sizeof(buffer), "SomeString"); return 0; } (fails compilation with the error: C3861: 'snprintf': identifier not found) I remember this being the case way back with VS 2005 and am shocked to see it still hasn't been fixed. Does any one know if Microsoft has any plans to move their standard C libraries into the year 2010?

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• best way to output a full precision double into a text file

  - by flevine100

  Hi, I need to use an existing text file to store some very precise values. When read back in, the numbers essentially need to be exactly equivalent to the ones that were originally written. Now, a normal person would use a binary file... for a number of reasons, that's not possible in this case. So... do any of you have a good way of encoding a double as a string of characters (aside from increasing the precision). My first thought was to cast the double to a char[] and write out the chars. I don't think that's going to work because some of the characters are not visible, produce sounds, and even terminate strings ('\0'... I'm talkin to you!) Thoughts?

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• Socket programming question

  - by dfddf

  I am given the following declaration: char inbuff[500], *ptr; int n, bufferlen; Write a program segement to receive a message having 500 bits from the TCP socket sock and store this message in inbuff. My answer is: n = recv( sock, inbuff, strlen( inbuff ), 0 ); However, I am not sure why *ptr is given in the declaration. So, I would like ask, what is the purpose of the pointer in this question?? Or my program segement is wrong? Thank you for all of yours help first!

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• Parse a string containing percent sign into decimal

  - by Sebastian Seifert

  I have a simple string containing VAT-percantage value that needs to be stored in a decimal. The string looks like this: "19.00%". When I use the decimal.Parse() methode I always get an FormatException. Code looks like this NumberFormatInfo nfi = new NumberFormatInfo() { PercentDecimalSeparator = ".", PercentSymbol = "%" }; decimal.Parse("19.00%",NumberStyles.Any, nfi); I know, that it would be possible (in the excample above) to simply remove the %-char from the string and then parse. But isn't there a solution to use built in parsing, which can be used without testing the string for the type of number the user typed in.

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