inno setup

1. Custom installation step
   by overwriting function InitializeSetup (): Boolean; to implement custom installation,
   to be noted that this method, if the return value is false, then the installation procedure terminates subsequent

2. Return value
   The return value is agreed Result

3. Automatically installed
   in [the Run] added to the configuration node configured to be installed
   Example:

Filename: {tmp}\vc_redist_x86.exe; Parameters: "/q:a /c:""install /l /q"""; WorkingDir: {tmp}; Flags: skipifdoesntexist; StatusMsg: "Installing Microsoft Visual C++ Runtime ..."

1. Custom code
   add custom methods [Code] configuration

2. Detecting the presence or absence registry

   important

   According to 24K pure open source articles that
   64-bit systems need to change the original HKLM HKLM64

//检测vs++2015
Result:=RegValueExists(HKLM64, 'SOFTWARE\WOW6432Node\Microsoft\VisualStudio\14.0\VC\Runtimes\x86', 'Version');  
//检测.netframeword4.5.2
Result:=RegValueExists(HKLM64, 'SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full', 'Version'); 

1. Define exit the installer script

// ss
procedure ExitProcess(exitCode:integer);
  external '[email protected] stdcall';

1. The resource release to a temporary directory and call the
   resource first defined in [Files] required in
   cases of:

Source: "C:\Users\ives\Desktop\Output\vc_redist_x86.exe"; DestDir: "{tmp}"; Flags: ignoreversion;

Add the script required for detection, as defined in [code] in

function IsVC2015():boolean;
var
    version: Cardinal;
begin
Result:=RegValueExists(HKLM64, 'SOFTWARE\WOW6432Node\Microsoft\VisualStudio\14.0\VC\Runtimes\x86', 'Version');  
end; 

The last call InitializeSetup mentioned above

function InitializeSetup(): Boolean; 
var Path:string; 
    ResultCode: Integer; 
begin 
    //检测vc++2015 
    if (IsVC2015()=false) then
    begin
        if MsgBox('正在安装必备组件vc_redist_x86，请稍后……', mbConfirmation, MB_YESNO) = idYes then
        begin
        ExtractTemporaryFile('vc_redist_x86.exe'); 
        Exec(ExpandConstant('{tmp}\vc_redist_x86.exe'), '', '', SW_SHOWNORMAL, ewWaitUntilTerminated, ResultCode);
        end; 
    end;
    Result:=true
end;