Reading a registry key in C

Question

I have developed an application and installed it on a client computer  In my application I need to get its installation path  My application has a registry entry at    HKEY LOCAL MACHINE SOFTWARE MyApplication  AppPath    How can I read AppPath using C

User · Answer

using Microsoft Win32     string chkRegVC    NO      private void checkReg vcredist              string regKey     SOFTWARE Microsoft Windows CurrentVersion Uninstall           using  Microsoft Win32 RegistryKey uninstallKey   Registry LocalMachine OpenSubKey regKey                         if  uninstallKey    null                                string   productKeys   uninstallKey GetSubKeyNames                    foreach  var keyName in productKeys                                         if  keyName      196BB40D-1578-3D01-B289-BEFC77A11A1E       Visual C   2010 Redistributable Package  x86                           keyName      DA5E371C-6333-3D8A-93A4-6FD5B20BCC6E       Visual C   2010 Redistributable Package  x64                           keyName      C1A35166-4301-38E9-BA67-02823AD72A1B       Visual C   2010 Redistributable Package  ia64                           keyName      F0C3E5D1-1ADE-321E-8167-68EF0DE699A5       Visual C   2010 SP1 Redistributable Package  x86                           keyName      1D8E6291-B0D5-35EC-8441-6616F567A0F7       Visual C   2010 SP1 Redistributable Package  x64                           keyName      88C73C1C-2DE5-3B01-AFB8-B46EF4AB41CD       Visual C   2010 SP1 Redistributable Package  ia64                               chkRegVC    OK   break                        else   chkRegVC    NO

User · Answer

see this http   www codeproject com Articles 3389 Read-write-and-delete-from-registry-with-C  Updated     You can use RegistryKey class under Microsoft Win32 namespace   Some important functions of RegistryKey are as follows   GetValue         to get value of a key SetValue         to set value to a key DeleteValue      to delete value of a key OpenSubKey       to read value of a subkey  read-only  CreateSubKey     to create new or edit value to a subkey DeleteSubKey     to delete a subkey GetValueKind     to retrieve the datatype of registry key

User · Answer

You re looking for the cunningly named Registry GetValue method

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You can use the following to get where the registry thinks it s installed    string Registry LocalMachine GetValue   SOFTWARE MyApplication AppPath       Installed   null     Or you can use the following to find out where the application is actually being launched from   System Windows Forms Application StartupPath   The latter is more reliable than the former if you re trying to use the  exe location as a relative path to find related files   The user could easily move things around after the install and still have the app work fine because  NET apps aren t so dependent upon the registry   Using StartupPath  you could even do something clever like have your app update the registry entries at run time instead of crashing miserably due to missing wrong corrupted entries   And be sure to look at the app settings functionality as storage for values rather than the registry  Properties Settings Default mySettingEtc    You can read write settings for the app and or the user levels that get saved as simple MyApp exe config files in standard locations   A nice blast from the past  good old Win 3 1 DOS days  to have the application install delete be a simple copy delete of a folder structure or two rather than some convoluted  arcane install uninstall routine that leaves all kinds of garbage in the registry and sprinkled all over the hard drive

User · Answer

string InstallPath    string Registry GetValue   HKEY LOCAL MACHINE SOFTWARE MyApplication AppPath    Installed   null       if  InstallPath    null           Do stuff     That code should get your value  You ll need to be  using Microsoft Win32    for that to work though

User · Answer

If you want it casted to a specific type you can use this method  Most non primitive types won t by default support direct casting so you will have to handle those accordingly         public T GetValue lt T gt  string registryKeyPath  string value  T defaultValue   default T           T retVal   default T          retVal    T Registry GetValue registryKeyPath  value  defaultValue          return retVal

[c#] Reading a registry key in C#

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