注册表的写入以及环境的删除和使用

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

#define MyAppName "My Program"
#define MyAppVersion "1.5"
#define MyAppPublisher "My Company, Inc."
#define MyAppURL "https://www.example.com/"
#define MyAppExeName "MyProg.exe"
#define MyAppAssocName MyAppName + " File"
#define MyAppAssocExt ".myp"
#define MyAppAssocKey StringChange(MyAppAssocName, " ", "") + MyAppAssocExt

[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={{79E2CD03-D170-4011-A9FD-8D55CEA75DC9}
AppName={#MyAppName}
AppVersion={#MyAppVersion}
;AppVerName={#MyAppName} {#MyAppVersion}
AppPublisher={#MyAppPublisher}
AppPublisherURL={#MyAppURL}
AppSupportURL={#MyAppURL}
AppUpdatesURL={#MyAppURL}
DefaultDirName={autopf}{#MyAppName}
ChangesAssociations=yes
DisableProgramGroupPage=yes
; Uncomment the following line to run in non administrative install mode (install for current user only.)
;PrivilegesRequired=lowest
OutputDir=C:UsersAdministratorDesktop
OutputBaseFilename=mysetup
SetupIconFile=C:UsersAdministratorDesktopagowy-k3amy-001.ico
Compression=lzma
SolidCompression=yes
WizardStyle=modern
ChangesEnvironment=yes

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

[Tasks]
Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: unchecked

[Files]
Source: "C:Program Files (x86)Inno Setup 6Examples{#MyAppExeName}"; DestDir: "{app}"; Flags: ignoreversion
; NOTE: Don't use "Flags: ignoreversion" on any shared system files

[Registry]
Root: HKCR; Subkey: "Test"; ValueType: string; ValueName: "URL Protocol"; ValueData: ""; Flags: uninsdeletevalue
Root: HKCR; Subkey: "Test"; ValueType: string; ValueName: ""; ValueData: "Test Protocol"; Flags: uninsdeletevalue
Root: HKCR; Subkey: "TestDefaultIcon"; ValueType: string; ValueName: ""; ValueData: """{app}{#MyAppExeName}"""; Flags: uninsdeletekey
Root: HKCR; Subkey: "Testshell"; ValueType: none; ValueName: ""; ValueData: ""
Root: HKCR; Subkey: "Testshellopen"; ValueType: none; ValueName: ""; ValueData: ""
Root: HKCR; Subkey: "Testshellopencommand"; ValueType: string; ValueName: ""; ValueData: """{app}{#MyAppExeName}"" ""%1"""

[Icons]
Name: "{autoprograms}{#MyAppName}"; Filename: "{app}{#MyAppExeName}"
Name: "{autodesktop}{#MyAppName}"; Filename: "{app}{#MyAppExeName}"; Tasks: desktopicon

[Run]
Filename: "{app}{#MyAppExeName}"; Description: "{cm:LaunchProgram,{#StringChange(MyAppName, '&', '&&')}}"; Flags: nowait postinstall skipifsilent

[code]
const EnvironmentKey = 'Environment';

procedure EnvAddPath(instlPath: string);
var
    Paths: string;
begin
    { 检索当前的路径 }
    if not RegQueryStringValue(HKEY_CURRENT_USER, EnvironmentKey, 'Path', Paths) then
        Paths := '';

    if Paths = '' then
        Paths := instlPath + ';'
    else
    begin
        { 如果已在路径中找到字符串则跳过 }
        if Pos(';' + Uppercase(instlPath) + ';',  ';' + Uppercase(Paths) + ';') > 0 then exit;
        if Pos(';' + Uppercase(instlPath) + '\;', ';' + Uppercase(Paths) + ';') > 0 then exit;

        { 将应用安装路径附加到路径变量的末尾 }
        Log(Format('Right(Paths, 1): [%s]', [Paths[length(Paths)]]));
        if Paths[length(Paths)] = ';' then
            Paths := Paths + instlPath + ';'  { 不要加倍';'在环境（路径）中 }
        else
            Paths := Paths + ';' + instlPath + ';' ;
    end;

    { 覆盖（或在缺少时创建）路径环境变量 }
    if RegWriteStringValue(HKEY_CURRENT_USER, EnvironmentKey, 'Path', Paths)
    then Log(Format('The [%s] added to PATH: [%s]', [instlPath, Paths]))
    else Log(Format('Error while adding the [%s] to PATH: [%s]', [instlPath, Paths]));
end;


procedure EnvRemovePath(instlPath: string);
var
    Paths: string;
    P, Offset, DelimLen: Integer;
begin
    { 如果注册表项不存在则跳过 }
    if not RegQueryStringValue(HKEY_CURRENT_USER, EnvironmentKey, 'Path', Paths) then
        exit;

    { 如果在路径中找不到字符串则跳过 }
    DelimLen := 1;     { Length(';') }
    P := Pos(';' + Uppercase(instlPath) + ';', ';' + Uppercase(Paths) + ';');
    if P = 0 then
    begin
        { 也许 instlPath 存在于 Paths 中，但以 '\;' 结尾 }
        DelimLen := 2; { Length('\;') }
        P := Pos(';' + Uppercase(instlPath) + '\;', ';' + Uppercase(Paths) + ';');
        if P = 0 then exit;
    end;

    { 确定在 Delete() 操作中从何处开始字符串子集。 }
    if P = 1 then
        Offset := 0
    else
        Offset := 1;
    { 更新路径变量 }
    Delete(Paths, P - Offset, Length(instlPath) + DelimLen);

    { 覆盖路径环境变量 }
    if RegWriteStringValue(HKEY_CURRENT_USER, EnvironmentKey, 'Path', Paths)
    then Log(Format('The [%s] removed from PATH: [%s]', [instlPath, Paths]))
    else Log(Format('Error while removing the [%s] from PATH: [%s]', [instlPath, Paths]));
end;

procedure CurStepChanged(CurStep: TSetupStep);
begin
    if CurStep = ssPostInstall
    then EnvAddPath(ExpandConstant('{app}'));
end;

procedure CurUninstallStepChanged(CurUninstallStep: TUninstallStep);
begin
    if CurUninstallStep = usPostUninstall
    then EnvRemovePath(ExpandConstant('{app}'));
end;