Inno Setup: Verify that .NET 4.0 is installed

Question

I have a component that requires .NET 4.0 to run, how can my Inno Setup installer verify that it is installed, and if not, prompt the user to install it?

Answer 1

The InitializeSetup function is called when the Inno Setup executable is run. Inserting this code for a custom script should do what you want:

function IsDotNetDetected(version: string; service: cardinal): boolean; // Indicates whether the specified version and service pack of the .NET Framework is installed. // // version -- Specify one of these strings for the required .NET Framework version: //    'v1.1'          .NET Framework 1.1 //    'v2.0'          .NET Framework 2.0 //    'v3.0'          .NET Framework 3.0 //    'v3.5'          .NET Framework 3.5 //    'v4\Client'     .NET Framework 4.0 Client Profile //    'v4\Full'       .NET Framework 4.0 Full Installation //    'v4.5'          .NET Framework 4.5 //    'v4.5.1'        .NET Framework 4.5.1 //    'v4.5.2'        .NET Framework 4.5.2 //    'v4.6'          .NET Framework 4.6 //    'v4.6.1'        .NET Framework 4.6.1 //    'v4.6.2'        .NET Framework 4.6.2 //    'v4.7'          .NET Framework 4.7 //    'v4.7.1'        .NET Framework 4.7.1 //    'v4.7.2'        .NET Framework 4.7.2 //    'v4.8'          .NET Framework 4.8 // // service -- Specify any non-negative integer for the required service pack level: //    0               No service packs required //    1, 2, etc.      Service pack 1, 2, etc. required var     key, versionKey: string;     install, release, serviceCount, versionRelease: cardinal;     success: boolean; begin     versionKey := version;     versionRelease := 0;      // .NET 1.1 and 2.0 embed release number in version key     if version = 'v1.1' then begin         versionKey := 'v1.1.4322';     end else if version = 'v2.0' then begin         versionKey := 'v2.0.50727';     end      // .NET 4.5 and newer install as update to .NET 4.0 Full     else if Pos('v4.', version) = 1 then begin         versionKey := 'v4\Full';         case version of           'v4.5':   versionRelease := 378389;           'v4.5.1': versionRelease := 378675; // 378758 on Windows 8 and older           'v4.5.2': versionRelease := 379893;           'v4.6':   versionRelease := 393295; // 393297 on Windows 8.1 and older           'v4.6.1': versionRelease := 394254; // 394271 before Win10 November Update           'v4.6.2': versionRelease := 394802; // 394806 before Win10 Anniversary Update           'v4.7':   versionRelease := 460798; // 460805 before Win10 Creators Update           'v4.7.1': versionRelease := 461308; // 461310 before Win10 Fall Creators Update           'v4.7.2': versionRelease := 461808; // 461814 before Win10 April 2018 Update           'v4.8':   versionRelease := 528040; // 528049 before Win10 May 2019 Update         end;     end;      // installation key group for all .NET versions     key := 'SOFTWARE\Microsoft\NET Framework Setup\NDP\' + versionKey;      // .NET 3.0 uses value InstallSuccess in subkey Setup     if Pos('v3.0', version) = 1 then begin         success := RegQueryDWordValue(HKLM, key + '\Setup', 'InstallSuccess', install);     end else begin         success := RegQueryDWordValue(HKLM, key, 'Install', install);     end;      // .NET 4.0 and newer use value Servicing instead of SP     if Pos('v4', version) = 1 then begin         success := success and RegQueryDWordValue(HKLM, key, 'Servicing', serviceCount);     end else begin         success := success and RegQueryDWordValue(HKLM, key, 'SP', serviceCount);     end;      // .NET 4.5 and newer use additional value Release     if versionRelease > 0 then begin         success := success and RegQueryDWordValue(HKLM, key, 'Release', release);         success := success and (release >= versionRelease);     end;      result := success and (install = 1) and (serviceCount >= service); end;  function InitializeSetup(): Boolean; begin     if not IsDotNetDetected('v4.6', 0) then begin         MsgBox('MyApp requires Microsoft .NET Framework 4.6.'#13#13             'Please use Windows Update to install this version,'#13             'and then re-run the MyApp setup program.', mbInformation, MB_OK);         result := false;     end else         result := true; end; 

(Code taken from here: http://www.kynosarges.de/DotNetVersion.html)

First, it checks for the presence of a registry entry that indicates the version of the .NET framework that is installed. If the registry entry is not present, it prompts the user to download the .NET framework. If the user says Yes, it opens the download URL. (You may have to change the version it specifies in the script to version 4.0.)

I also came across [this article on CodeProject][1], which may be a more comprehensive and customizable way of doing what you're looking for, although it may take more work to understand and will have to be modified to work with version 4.0.

Answer 2

@Cody Gray - Thanks for your solution. Very helpful!

In case anyone is interested, here is my take on his function using enumeration values instead of strings. This change is purely a matter of personal preference. The code includes the changes for v4.5 and seems to work properly based on my limited testing.

David

[Code]  // // Enumeration used to specify a .NET framework version  // type TDotNetFramework = (     DotNet_v11_4322,  // .NET Framework 1.1     DotNet_v20_50727, // .NET Framework 2.0     DotNet_v30,       // .NET Framework 3.0     DotNet_v35,       // .NET Framework 3.5     DotNet_v4_Client, // .NET Framework 4.0 Client Profile     DotNet_v4_Full,   // .NET Framework 4.0 Full Installation     DotNet_v45);      // .NET Framework 4.5  // // Checks whether the specified .NET Framework version and service pack // is installed (See: http://www.kynosarges.de/DotNetVersion.html) // // Parameters: //   Version     - Required .NET Framework version //   ServicePack - Required service pack level (0: None, 1: SP1, 2: SP2 etc.) // function IsDotNetInstalled(Version: TDotNetFramework; ServicePack: cardinal): boolean;   var     KeyName      : string;     Check45      : boolean;     Success      : boolean;     InstallFlag  : cardinal;      ReleaseVer   : cardinal;     ServiceCount : cardinal;   begin     // Registry path for the requested .NET Version     KeyName := 'SOFTWARE\Microsoft\NET Framework Setup\NDP\';      case Version of       DotNet_v11_4322:  KeyName := KeyName + 'v1.1.4322';       DotNet_v20_50727: KeyName := KeyName + 'v2.0.50727';       DotNet_v30:       KeyName := KeyName + 'v3.0';       DotNet_v35:       KeyName := KeyName + 'v3.5';       DotNet_v4_Client: KeyName := KeyName + 'v4\Client';       DotNet_v4_Full:   KeyName := KeyName + 'v4\Full';       DotNet_v45:       KeyName := KeyName + 'v4\Full';     end;      // .NET 3.0 uses "InstallSuccess" key in subkey Setup     if (Version = DotNet_v30) then       Success := RegQueryDWordValue(HKLM, KeyName + '\Setup', 'InstallSuccess', InstallFlag) else       Success := RegQueryDWordValue(HKLM, KeyName, 'Install', InstallFlag);      // .NET 4.0/4.5 uses "Servicing" key instead of "SP"     if (Version = DotNet_v4_Client) or        (Version = DotNet_v4_Full) or        (Version = DotNet_v45) then       Success := Success and RegQueryDWordValue(HKLM, KeyName, 'Servicing', ServiceCount) else       Success := Success and RegQueryDWordValue(HKLM, KeyName, 'SP', ServiceCount);      // .NET 4.5 is distinguished from .NET 4.0 by the Release key     if (Version = DotNet_v45) then       begin         Success := Success and RegQueryDWordValue(HKLM, KeyName, 'Release', ReleaseVer);         Success := Success and (ReleaseVer >= 378389);       end;      Result := Success and (InstallFlag = 1) and (ServiceCount >= ServicePack);   end;