c# - FatalExecutionEngineError with MySQLConnector/Net -


i'm developing c#.net application connects mysql db , uses unsafe code able use old c++ dll.

as program starts, load dll , allocate pointer, initialize c# variables, delete pointer.

in program have dialog has tab control within. constructor of "dialog" fetches data variables initialized old dll , db , here start problems:

        dictionary<string, int> dizum;         mysqlcommand            mycom;         mysqlconnection         myconn;         mysqldatareader         myread;          cmbrighecons.items.add( mosaicos.properties.resources.str_cons_desc_gen );         cmbrighecons.items.add( mosaicos.properties.resources.str_cons_tip_sott );         cmbrighecons.items.add( mosaicos.properties.resources.str_cons_sott );         cmbrighecons.items.add( mosaicos.properties.resources.str_cons_nom_pez_cons );         cmbrighecons.selectedindex = mosaicomain.cfg.desccons;         cmbrighevarmat.items.add( mosaicos.properties.resources.str_cons_desc_gen );         cmbrighevarmat.items.add( mosaicos.properties.resources.str_cons_tip_sott );         cmbrighevarmat.items.add( mosaicos.properties.resources.str_cons_sott );         cmbrighevarmat.items.add( mosaicos.properties.resources.str_cons_nom_pez_cons );         cmbrighevarmat.items.add( mosaicos.properties.resources.str_cons_nom_pez_nel_cons );         cmbrighevarmat.selectedindex = mosaicomain.cfg.descvarmat;         try         {             string connessione;              connessione = mosaicomain.cfg.dbconnection.replace( "option=3;", "" );             connessione = connessione.replace( "driver={mysql odbc 5.1 driver};", "" );             myconn = new mysqlconnection( connessione );             mycom = new mysqlcommand();             myconn.open();             mycom.connection = myconn;             mycom.commandtext = @"select umi_id, umi_um unimis umi_tipoum = 0 order umi_um;";             myread = mycom.executereader();             dizum = new dictionary<string, int>();             while( myread.read() )                 dizum.add( myread.getstring( 1 ), myread.getint32( 0 ) );             cmbumsup.datasource = new bindingsource( dizum, null );             cmbumsup.displaymember = "key";             cmbumsup.valuemember = "value";             myread.close();             myconn.close();         }         catch( mysqlexception mysqlexception )         {             messagebox.show( mysqlexception.tostring() );         }

here if comment myconn.open(); myconn.close(); i've got no troubles, opening connection results in immediate program crash when switch between tables, not in part of program in:

    private void configurazionitoolstripmenuitem1_click( object sender, eventargs e )     {         try         {             frmconfig = new frmconfigurazioni();             frmconfig.showdialog();         }         catch( exception exception )         {             messagebox.show( exception.tostring() );         }     }

which load previous code snippet. error is:

managed debugging assistant 'fatalexecutionengineerror' has detected problem in  'c:\develop\mosaicos\mosaicos\bin\debug\mosaicos.vshost.exe'. additional information: runtime has encountered fatal error.  address of error @ 0x792380d9, on thread 0x824.  error code 0xc0000005.  error may bug in clr or in unsafe or non-verifiable portions of user code.  common sources of bug include user marshaling errors com-interop or pinvoke, may corrupt stack.

and not exception. if comment code, don't crash, also, if try connect same string same database in solution, i've got no problems. how can solve this?

thanks in advance.

'0xc0000005' access violation exception. difficult find out wrong code have provided. suggest find source code of old c++ dll , debug them in 1 solution. can debug c++ dll .net checking "enable unmanaged code debugging" check box under debug section in .net project properties.


Comments

Post a Comment

Popular posts from this blog

Why does Ruby on Rails generate add a blank line to the end of a file? -

running rails generate controller foo home results in: class foocontroller < application controller def home end end (there's nothing on line in actual file, blank line) is there purpose blank line? it's common use newline indicate end of line, last line. many editors (like vi, use) add in newline silently. consensus text files (especially in unix world) should end in newline, , there have been problems historically if wasn't present. why should text files end newline? the tool used count lines in file "wc" counts newlines in file, without trailing newline show 3 instead of 4. it improves readability of templates used in generator. consider: https://github.com/rails/rails/blob/master/railties/lib/rails/generators/rails/controller/templates/controller.rb to remove trailing newline, template have last line of: end<% end -%> instead of: end <% end -%> that seems less readable me. the discussion below refers
Read more

keyboard - Smiles and long press feature in Android -

i've created android keyboard. how add features inserting smilies, , using long keypresses display symbols? to create long-press behavior allows select several options pop-up menu, follow guide (specifically pop-up menu section): http://developer.android.com/guide/topics/ui/menus.html smileys (also known emoticons) combination of keys, understood programs , parsed same way. have do, when clicks smiley face on keyboard, simulate pressing of key combination matching emoticon. example, when clicks smiley, should simulate key presses ':' , ')' :). here's list of emoticons: http://en.wikipedia.org/wiki/list_of_emoticons
Read more

node.js - Bad Request - node js ajax post -

i'm using express 3.0 , node v0.11.0. have button submits form , i'm using ajax post data json object node server. client code is: $('#contact').submit(function(e) { console.log('submit called'); var formdata = json.stringify($('form').serializeobject()); console.log(formdata); $.ajax({ url: "http://localhost:3000/savedata/", type: "post", datatype: 'json', data: {objectdata: formdata}, contenttype: "application/json", complete: function() { console.log('process complete'); }, success: function(data) { console.log('process sucess'); }, error: function() { console.log('process error'); }, }); return false; }); then on server: var express = require('express'); var app = express(); app.set('views', __dirname + '/views'); app.set('view engine', 'jade'); app.use(express.bodyparser());
Read more