BadImageFormatException This will occur when running in 64 bit mode with the 32 bit Oracle client components installed

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I am getting this error while on of my  Net application are trying to make a connection to oracle database   The error says that This problem will occur when running in 64 bit mode with the 32 bit Oracle client components installed   But I have made sure many times that the client installed in x64 bit not 32   Date Time  6 8 2014 10 57 55 AM  System InvalidOperationException  Attempt to load Oracle client libraries threw BadImageFormatException   This problem will occur when running in 64 bit mode with the 32 bit Oracle client components installed  --- gt  System BadImageFormatException  An attempt was made to load a program with an incorrect format   Exception from HRESULT  0x8007000B         at System Data Common UnsafeNativeMethods OCILobCopy2 IntPtr svchp  IntPtr errhp  IntPtr dst locp  IntPtr src locp  UInt64 amount  UInt64 dst offset  UInt64 src offset         at System Data OracleClient OCI DetermineClientVersion          --- End of inner exception stack trace ---        at System Data OracleClient OCI DetermineClientVersion          at System Data OracleClient OracleInternalConnection OpenOnLocalTransaction String userName  String password  String serverName  Boolean integratedSecurity  Boolean unicode  Boolean omitOracleConnectionName         at System Data OracleClient OracleInternalConnection  ctor OracleConnectionString connectionOptions         at System Data OracleClient OracleConnectionFactory CreateConnection DbConnectionOptions options  Object poolGroupProviderInfo  DbConnectionPool pool  DbConnection owningObject         at System Data ProviderBase DbConnectionFactory CreatePooledConnection DbConnection owningConnection  DbConnectionPool pool  DbConnectionOptions options         at System Data ProviderBase DbConnectionPool CreateObject DbConnection owningObject         at System Data ProviderBase DbConnectionPool UserCreateRequest DbConnection owningObject         at System Data ProviderBase DbConnectionPool GetConnection DbConnection owningObject         at System Data ProviderBase DbConnectionFactory GetConnection DbConnection owningConnection         at System Data ProviderBase DbConnectionClosed OpenConnection DbConnection outerConnection  DbConnectionFactory connectionFactory         at System Data OracleClient OracleConnection Open          at CustomizedSetupInstaller Runscripts InitializeDBObjects String connectionString  String dbProvider

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To revise IIS    Select Application Pools  Clic in ASP  NET V4 0 Classic  Select Advanced Settings  In General  option Enable 32-Bit Applications  default is false  Select TRUE  Refresh and check site    Comment   Platform  Windows Server 2008 R2 Enterprise - 64Bit - IIS 7 5

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this solution work for me    To revise IIS  Select Application Pools  Clic in ASP  NET V4 0 Classic  Select Advanced Settings  In General  option Enable 32-Bit Applications  default is false  Select TRUE  Refresh and check site    Comment   Platform  Windows Server 2012 Standart- 64Bit - IIS 8

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Make sure that registry HKEY LOCAL MACHINE SOFTWARE ORACLE ODP NET 4 112    DIIPath key is pointing to 32 bit Oarcle client BIN directory   For example  DIIPath value can be C  app User name 11 2 0 client 32bit bin

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Mine is the console application  it should work for the windows application as well  and I had same problem  To solve it I used PlatformTarget as x64 as my System Data OracleClient dll  64 bit file  is at C  Program Files  x86  Reference Assemblies Microsoft Framework NETFramework v4 5  This will explicitly use 64 bit version of Oracle Client  This might help you if your solution works only on 64bit and if you are not using 32 bit dlls like dlls made in VB  I hope it will help you

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As apc mentioned that error occurs  when a 32bit dll calls a 64bit dll or vice versa   The problem is that if you have build using AnyCPU and are running on a 64bit environment then the application will run as 64bit   If rebuilding explicitly for 32 and 64 bit is not an option then you could use a microsoft utility called corflags exe which comes with the Windows SDK  Basically  you can modify a flag in the exe of the program you are executing to tell it to run as 32bit even if the environment is 64bit   See here for information on using it

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I had the same issue  then I fix it by change configuration manager x86 - gt  x64 and build

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One solution is to install both x86  32-bit  and x64 Oracle Clients on your machine  then it does not matter on which architecture your application is running    Here an instruction to install x86 and x64 Oracle client on one machine   Assumptions  Oracle Home is called OraClient11g home1  Client Version is 11gR2   Optionally remove any installed Oracle client  see How to uninstall   completely remove Oracle 11g  client   if you face problems  Download and install Oracle x86 Client  for example into C  Oracle 11 2 Client x86 Download and install Oracle x64 Client into different folder  for example to C  Oracle 11 2 Client x64 Open command line tool  go to folder  WINDIR  System32  typically C  Windows System32 and create a symbolic link ora112 to folder C  Oracle 11 2 Client x64  see commands section below  Change to folder  WINDIR  SysWOW64  typically C  Windows SysWOW64 and create a symbolic link ora112 to folder C  Oracle 11 2 Client x86   see below  Modify the PATH environment variable  replace all entries like C  Oracle 11 2 Client x86 and C  Oracle 11 2 Client x64 by C  Windows System32 ora112  respective their  bin subfolder  Note  C  Windows SysWOW64 ora112 must not be in PATH environment  If needed set your ORACLE HOME environment variable to C  Windows System32 ora112 Open your Registry Editor  Set Registry value HKLM Software ORACLE KEY OraClient11g home1 ORACLE HOME to C  Windows System32 ora112 Set Registry value HKLM Software Wow6432Node ORACLE KEY OraClient11g home1 ORACLE HOME to C  Windows System32 ora112  not C  Windows SysWOW64 ora112  You are done  Now you can use x86 and x64 Oracle client seamless together  i e  an x86 application will load the x86 libraries  an x64 application loads the x64 libraries without any further modification on your system  Probably it is a wise option to set your TNS ADMIN environment variable  resp  TNS ADMIN entries in Registry  to a common location  for example TNS ADMIN C  Oracle Common network    Commands to create symbolic links   cd C  Windows System32 mklink  d ora112 C  Oracle 11 2 Client x64 cd C  Windows SysWOW64 mklink  d ora112 C  Oracle 11 2 Client x86  Notes    Both symbolic links must have the same name  e g  ora112    Despite of their names folder C  Windows System32 contains the x64 libraries  whereas C  Windows SysWOW64 contains the x86  32-bit  libraries  Don t be confused

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I had the same issue on a Windows 10 PC  I copied the project from my old computer to the new one  both 64 bits  and I installed the Oracle Client 64 bit on the new machine  I got the same error message  but after trying many solutions to no effect  what actually worked for me was this  In your Visual Studio  mine is 2017  go to  Tools   Options   Projects and Solutions   Web Projects  On that page  check the option that says  Use the 64 bit version of IIS Express for Websites and Projects

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As it was pointed out in the comments  System Data OracleClient is deprecated   There is little reason to start using it so late in the game   Also as pointed out in the comments  I ve marked this as community wiki in observence   there is now a managed provider as part of the 12c and later versions of the odp net package   This provider does NOT require any unmanaged dlls so this should be a non issue in that case   If you would prefer to use the old unmanaged Oracle DataAccess provider from oracle  the simplest solution is to set the  DllPath  configuration variable    lt  xml version  1 0  encoding  utf-8    gt   lt configuration gt     lt oracle dataaccess client gt       lt add key  DllPath             value  C  oracle bin   gt     lt  oracle dataaccess client gt   lt  configuration gt    See  Search Order for Unmanaged DLLs  in http   docs oracle com database 121 ODPNT InstallODP htm for more information

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I developed desktop application using C  net with 2 0 framework along with  system data oracleclient for connecting oracle db and I was facing similar error message   Attempt to load Oracle client libraries threw BadImageFormatException   This problem will occur when running in 64 bit mode with the 32 bit Oracle client components installed    following solutions were applied   Project  properties  Build TAB  select platform target   x86  Project  clean build  ReBuild solution Install Oracle 11G 32 bit client    now  it work because application is set for 32bit and oracle 32bit client installed over Win2012 R2 server  hopefully will work for you

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Make Enable32bit Application to TRUE in the IIS App pool which you are consuming

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For ssis 2008  just active 32bit run  bellow  Image   click on this link

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I had the same problem in SSIS 2008  I tried to connect to an Oracle 11g using ODAC 12c 32 bit  Tried to install ODAC 12c 64 bit as well  SSIS was actually able to preview the table but when trying to run the package it was giving this error message  Nothing helped   Switched to VS 2013  now it was running in debug mode but got the same error when the running the package using dtexec  f filename  Then I found this page  http   sqlmag com comment reply 17881   To make it short it says   if the page is still there just go to the page and follow the instrucrtions     1  Download and install the latest version of odac 64 bit xcopy from oracle site  2  Download and install the latest version of odac 32 bit xcopy from oracle site  How  open a cmd shell AS AN ADMINSTARTOR and run  c  64bitODACLocation  install bat oledb c  odac odac64  the first parameter is the component you want to install  The second param is where to install to  install the 32 version as well like this  c  32bitODACLocation  install bat oledb c  odac odac32  3  Change the path of the system to include c  odac odac32  c  odac odac32 bin  c  odac odac64 c  odac odac64 bin IN THIS ORDER  4  Restart the machine  5  make sure you have the same tnsnames ora in both odac32 admin network and odac64 admin network folders  or at least the same entry for your connection   6  Now open up SSIS in visual studio  I used the free 2013 version with the ssis package  - Use OLEDB and then select the Oracle Provider for OLE DB provider as your connection type  Set the name of the entry in your tnsnames ora as the  server or file name   Username is your schema name  db name  and password is the password for schema  you are done   Again  you can find the very detailed solution and much more in the original site   This was the only thing which worked for me and did not mess up my environment    Cheers  gcr

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I was also getting the same error I checked it my system was in 64 bit and I was using oracle DataAccess of 32 bit version I added correct 64 version now it got resolved  below path for the ref of Oracle DataAccess dll  Correct path for 64 bit OS- C  Oracle 11g 64 product 11 2 0 client 64 odp net bin 4 Oracle DataAccess dll  Correct path for 32 bit OS- C  Oracle 11g 32 product 11 2 0 client 64 odp net bin 4 Oracle DataAccess dll

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I got this issue for a console Application   In my case i just changed the Platform Target to  Any CPU  which you can see when you right click your solution and click on properties   you will find a Tab  Build  click on it  you will see  Platform target   change it to  Any CPU   which will solve your issue

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BadImageFormatException occures when a 32bit  x86  dll calls a 64bit dll or vice versa  If using AnyCPU for your entry executable then when run on a 64bit machine it will run as 64bit  however if that then calls a 32bit dll you get the exception which is why AnyCPU isn t always the answer   I tend to build everything as 32bit  x86  as we still have to interface with some old components done in VB6  32bit  x86    While performance might be better for 64bit machines if we where to build in AnyCPU reliability is more important for us   I would suggest trying to build all you components in 32bit  x86   unless you are doing some really intensive stuff I doubt it will make much difference

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In my situation  the Oracle 11 2 32-bit client was installed on my 64-bit Windows 2008 R2 OS   My solution  In the Advanced Settings for the Application Pool assigned to my ASP NET application  I set Enable 32-Bit Applications to True   Please see below for the standalone  ashx test script that I used to test the ability to connect to Oracle  Before making the Application Pool change  its response was    Running as 64-bit  Connection failed       and after the Application Pool change    Running as 32-bit  Connection succeeded      TestOracle ashx     Script to Test an Oracle Connection via System Data OracleClient   To use  Change the user  password and host variables as appropriate   Note that this script can be used in a standalone fashion without disturbing your ASP NET web application project file  Just drop it in your application folder    lt    WebHandler Language  C   Class  Handler1    gt   lt    Assembly Name  System Data OracleClient  Version 2 0 0 0  Culture neutral  PublicKeyToken b77a5c561934e089    gt   using System  using System Data OracleClient  using System Web   public class Handler1   IHttpHandler       private static readonly string m User    USER       private static readonly string m Password    PASSWORD       private static readonly string m Host    HOST        public void ProcessRequest HttpContext context                context Response ContentType    text plain            string result   TestOracleConnection            context Response Write result              public bool IsReusable               get   return false               private string TestOracleConnection                 string result   IntPtr Size    8                 Running as 64-bit       Running as 32-bit             try                       string connString   String Format                 Data Source  0  Password  1  User ID  2                   m Host  m User  m Password                OracleConnection oradb   new OracleConnection                oradb ConnectionString   connString              oradb Open                oradb Close                result      Connection succeeded                      catch                       result      Connection failed                       return result

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I would like to add a resolution that worked for me  Setup  Oracle 11g 64 bits running on Windows 2008 R2  64 bits OS   Client is a  net framework 3 5 application  ported from 2 0  compiled with x86 platform setting   I had the exact same issue of BadImageFormatException  Compiling to 64 bits eliminates the exception but it was not an option for me as my app is using 32 bits activex components who do not work in 64 bits   I solved the issue by downloading Oracle Instant Client 11  this is just a bunch of DLL than can be xcopied  from Oracle website  and copying the files in my application files directory  See here   http   www oracle com technetwork database features oci instant-client-wp-131479 pdf  This has solved the issue  from ProcMon tool I can see that the locally copied oci dll gets loaded by System Data OracleClient and everything is fine   It could probably be done by changing environment settings like proposed above  but this method has the advantage of not altering any settings on the server configuration

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Just build your code in x86 mode  not in AnyCpu

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I had this error in my DNN application installed on Windows 2012 R2  It s using some 32 bit dll and only Oracle DataAccess dll x32 was working  My solution is    Uninstall old Oracle Client   ODAC  Install Oracle 11 Client x32  Install Oracle ODAC 12 x64  Check IIS Application Pool  Classic version  has option  Enable 32-Bit Applications    true

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Please download the correct version of Oracle Client like Oracle Client 11 2 32-Bit  which resolved the problem for me

[.net] BadImageFormatException. This will occur when running in 64 bit mode with the 32 bit Oracle client components installed

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