缘由：使用inno setup 生成的现有自动生成的卸载程序不能清理守护进程、更新进程、注册表等相关信息，造成信息残留，一定程度上影响安全性。
inno setup 生成的现有自动生成的卸载程序：
Why the uninstaller EXE has numbers in its name
Frequently new users wonder why the uninstaller EXE has numbers in its name (e.g. unins000.exe).
It is because Inno Setup allows multiple applications to be installed to the same directory. When that happens, the first application's uninstaller is named unins000.exe, the second application's uninstaller is named unins001.exe, and so on. If a fixed name were used, then it would only be possible to uninstall the most recently installed application.
卸载时删除注册表
在[Code]段添加如下代码：
procedure CurUninstallStepChanged(CurUninstallStep: TUninstallStep);
begin
if CurUninstallStep = usUninstall then
if MsgBox('您是否要删除注册信息？', mbConfirmation, MB_YESNO) = IDYES then
RegDeleteKeyIncludingSubkeys(HKEY_CURRENT_USER, 'Software\My Prog')
end;
使用时请将代码中红色部分替换为实际要保留的注册表信息。
如果想要 卸载时询问是否保留注册信息，可以把代码中蓝色部分改为 IDNO。
如果想要删除 文件或文件夹 ，可使用以下代码：
//删除 {app} 文件夹中的My Prog.exe
DeleteFile(ExpandConstant('{app}\My Prog.exe'));
//删除 {app} 文件夹及其中所有文件
DelTree(ExpandConstant('{app}'), True, True, True);
//删除 {app} 文件夹中的所有文件，但保留它本身
DelTree(ExpandConstant('{app}'), False, True, True);
//删除程序运行时的信息(整个目录删除)
function RegDeleteKeyIncludingSubkeys(const RootKey: Integer; const SubkeyName: String): Boolean;
//删除自启动信息
function RegDeleteValue(const RootKey: Integer; const SubKeyName, ValueName: String): Boolean;