obs-StreamFX/cmake/installer.iss.in

; Script generated by the Inno Setup Script Wizard.
; SEE THE DOCUMENTATION FOR DETAILS ON CREATING INNO SETUP SCRIPT FILES!

#define MyAppName "@PROJECT_FULL_NAME@"
#define MyAppVersion "@PROJECT_VERSION_MAJOR@.@PROJECT_VERSION_MINOR@.@PROJECT_VERSION_PATCH@.@PROJECT_VERSION_TWEAK@"
#define MyAppPublisher "Xaymars Technology Workshop"
#define MyAppURL "https://www.xaymar.com/"

[Setup]
; NOTE: The value of AppId uniquely identifies this application.
; Do not use the same AppId value in installers for other applications.
; (To generate a new GUID, click Tools | Generate GUID inside the IDE.)
AppId={{DE56A03A-C8A4-474B-83B0-CFD270262D38}}
AppName={#MyAppName}
AppVersion={#MyAppVersion}
;AppVerName={#MyAppName} {#MyAppVersion}
AppPublisher={#MyAppPublisher}
AppPublisherURL={#MyAppURL}
AppSupportURL={#MyAppURL}
AppUpdatesURL={#MyAppURL}
DefaultDirName={code:GetDirName}
DefaultGroupName={#MyAppName}
AllowNoIcons=yes
LicenseFile="@ISS_SOURCE_DIR@/LICENSE"
OutputDir="@ISS_PACKAGE_DIR@"
OutputBaseFilename=@CMAKE_PACKAGE_NAME@-@_PACKAGE_SUFFIX_OVERRIDE@
Compression=lzma
SolidCompression=yes
VersionInfoVersion={#MyAppVersion}
VersionInfoCompany={#MyAppPublisher}
VersionInfoDescription={#MyAppName} Setup

[Languages]
Name: "english"; MessagesFile: "compiler:Default.isl"

[Files]
Source: "@ISS_FILES_DIR@/*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs
; NOTE: Don't use "Flags: ignoreversion" on any shared system files

[Icons]
Name: "{group}\{cm:ProgramOnTheWeb,{#MyAppName}}"; Filename: "{#MyAppURL}"
Name: "{group}\{cm:UninstallProgram,{#MyAppName}}"; Filename: "{uninstallexe}"

[Code]
function GetDirName(Value: string): string;
var
  InstallPath: string;
begin
  // initialize default path, which will be returned when the following registry
  // key queries fail due to missing keys or for some different reason
  Result := '{pf}\obs-studio';
  // query the first registry value; if this succeeds, return the obtained value
  if RegQueryStringValue(HKLM32, 'SOFTWARE\OBS Studio', '', InstallPath) then
    Result := InstallPath
end;

/////////////////////////////////////////////////////////////////////
function GetUninstallString(): String;
var
  sUnInstPath: String;
  sUnInstallString: String;
begin
  sUnInstPath := ExpandConstant('Software\Microsoft\Windows\CurrentVersion\Uninstall\{#emit SetupSetting("AppId")}_is1');
  sUnInstallString := '';
  if not RegQueryStringValue(HKLM, sUnInstPath, 'UninstallString', sUnInstallString) then
    RegQueryStringValue(HKCU, sUnInstPath, 'UninstallString', sUnInstallString);
  Result := sUnInstallString;
end;


/////////////////////////////////////////////////////////////////////
function IsUpgrade(): Boolean;
begin
  Result := (GetUninstallString() <> '');
end;


/////////////////////////////////////////////////////////////////////
function UnInstallOldVersion(): Integer;
var
  sUnInstallString: String;
  iResultCode: Integer;
begin
// Return Values:
// 1 - uninstall string is empty
// 2 - error executing the UnInstallString
// 3 - successfully executed the UnInstallString

  // default return value
  Result := 0;

  // get the uninstall string of the old app
  sUnInstallString := GetUninstallString();
  if sUnInstallString <> '' then begin
    sUnInstallString := RemoveQuotes(sUnInstallString);
    if Exec(sUnInstallString, '/SILENT /NORESTART /SUPPRESSMSGBOXES','', SW_HIDE, ewWaitUntilTerminated, iResultCode) then
      Result := 3
    else
      Result := 2;
  end else
    Result := 1;
end;

/////////////////////////////////////////////////////////////////////
procedure CurStepChanged(CurStep: TSetupStep);
begin
  if (CurStep=ssInstall) then
  begin
    if (IsUpgrade()) then
    begin
      UnInstallOldVersion();
    end;
  end;
end;