share/WinGit/helpers.inc.iss

   1 [Code]
   2
   3 // Copies a NULL-terminated array of characters to a string.
   4 function ArrayToString(Chars:array of Char):String;
   5 var
   6     Len,i:Longint;
   7 begin
   8     Len:=GetArrayLength(Chars);
   9     SetLength(Result,Len);
  10
  11     i:=0;
  12     while (i<Len) and (Chars[i]<>#0) do begin
  13         Result[i+1]:=Chars[i];
  14         i:=i+1;
  15     end;
  16
  17     SetLength(Result,i);
  18 end;
  19
  20 // Copies a string to a NULL-terminated array of characters.
  21 function StringToArray(Str:String):array of Char;
  22 var
  23     Len,i:Longint;
  24 begin
  25     Len:=Length(Str);
  26     SetArrayLength(Result,Len+1);
  27
  28     i:=0;
  29     while i<Len do begin
  30         Result[i]:=Str[i+1];
  31         i:=i+1;
  32     end;
  33
  34     Result[i]:=#0;
  35 end;
  36
  37 // Returns the path to the common or user shell folder as specified in "Param".
  38 function GetShellFolder(Param:string):string;
  39 begin
  40     if IsAdminLoggedOn then begin
  41         Param:='{common'+Param+'}';
  42     end else begin
  43         Param:='{user'+Param+'}';
  44     end;
  45     Result:=ExpandConstant(Param);
  46 end;
  47
  48 // As IsComponentSelected() is not supported during uninstall, this work-around
  49 // simply checks the Registry. This is unreliable if the user runs the installer
  50 // twice, the first time selecting the component, the second deselecting it.
  51 function IsComponentInstalled(Component:String):Boolean;
  52 var
  53     UninstallKey,UninstallValue:String;
  54     Value:String;
  55 begin
  56     Result:=False;
  57
  58     UninstallKey:='SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{#APP_NAME}_is1';
  59     UninstallValue:='Inno Setup: Selected Components';
  60
  61     if RegQueryStringValue(HKEY_LOCAL_MACHINE,UninstallKey,UninstallValue,Value) then begin
  62         Result:=(Pos(Component,Value)>0);
  63     end;
  64 end;
  65
  66 // Checks whether the specified directory can be created and written to
  67 // by creating all intermediate directories and a temporary file.
  68 function IsDirWritable(DirName:String):Boolean;
  69 var
  70     AbsoluteDir,FirstExistingDir,FirstCreatedDir,FileName:String;
  71 begin
  72     Result:=True;
  73
  74     AbsoluteDir:=ExpandFileName(DirName);
  75
  76     FirstExistingDir:=AbsoluteDir;
  77     while not DirExists(FirstExistingDir) do begin
  78         FirstCreatedDir:=FirstExistingDir;
  79         FirstExistingDir:=ExtractFileDir(FirstExistingDir);
  80     end;
  81     Log('Line {#__LINE__}: First directory in hierarchy that already exists is "' + FirstExistingDir + '".')
  82
  83     if Length(FirstCreatedDir)>0 then begin
  84         Log('Line {#__LINE__}: First directory in hierarchy needs to be created is "' + FirstCreatedDir + '".')
  85
  86         if ForceDirectories(DirName) then begin
  87             FileName:=GenerateUniqueName(DirName,'.txt');
  88             Log('Line {#__LINE__}: Trying to write to temporary file "' + Filename + '".')
  89
  90             if SaveStringToFile(FileName,'This file is writable.',False) then begin
  91                 if not DeleteFile(FileName) then begin
  92                     Result:=False;
  93                 end;
  94             end else begin
  95                 Result:=False;
  96             end;
  97         end else begin
  98             Result:=False;
  99         end;
 100
 101         if not DelTree(FirstCreatedDir,True,False,True) then begin
 102             Result:=False;
 103         end;
 104     end;
 105 end;