Call SHGetSetSettings from Delphi

Question

I just read this question and this question , and since then I tried to call SHGetSetSettingsDelphi. This is a function shell32.dll, but not defined in ShlObj.pas, so we need to write our own definition.

First we need to translate the structure SHELLSTATE. Now I have only limited experience in C, but I believe that ": 1" means that the member of the structure is one bit, that is, eight of them can be packed together in bytes. I also assume that DWORD= UINT= 32-bit unsigned integers and that LONG= intare 32-bit integers. But then we have a problem: the whole structure will then take 228 bits, or 28.5 bytes, which ... is quite impossible, at least in Delphi, where it sizeof(SomeRecord)should be an integer.

However, I tried to solve this problem by adding four dummy bits at the end. 232 bits = 29 bytes, which is nice.

Therefore, I tried

PShellState = ^TShellState;
TShellState = packed record
  Data1: cardinal;
  Data2: cardinal;
  Data3: cardinal;
  Data4: cardinal;
  Data5: cardinal;
  Data6: cardinal;
  Data7: cardinal;
  Data8: byte; // Actually a nibble would be sufficient
end;

and then I announced (for later convenience)

const
  fShowAllObjects = 1;
  fShowExtensions = 2;
  fNoConfirmRecycle = 4;
  fShowSysFiles = 8;
  fShowCompColor = 16;
  fDoubleClickInWebView = 32;
  fDesktopHTML = 64;
  fWin95Classic = 128;
  fDontPrettyPath = 256;
  fShowAttribCol = 512;
  fMapNetDrvButton = 1024;
  fShowInfoTip = 2048;
  fHideIcons = 4096;
  fWebView = 8192;
  fFilter = 16384;
  fShowSuperHidden = 32768;
  fNoNetCrawling = 65536;

Now I felt ready to spot

interface
  procedure SHGetSetSettings(var ShellState: TShellState; Mask: cardinal; DoSet: boolean); stdcall;

implementation
  procedure SHGetSetSettings; external shell32 name 'SHGetSetSettings';

, - . , : SSF. , SSF_HIDEICONS = 0x00004000 = 16384 ≠ fHideIcons = 4096. SSF_ , SHELLSTATE, SSF_HIDEICONS 2 ^ 14, 13- ( 2 ^ 12) . , , MSDN .

- ?

Answer 1

, SSF_ . , ShellState.

fShowSysFiles, 8 (0x04), , SSF_SHOWSYSFILES - 0x20. .

Answer 2

D2010 SHELLSTATE ShlObj.pas, , , (17) ​​ Data: DWORD; (Yours is really OK). 18 19 . 2 DWORD/UINT 2 Win95unused, Data2.

, SSF SHGetSetSettings .

MSDN IMO:

  tagSHELLSTATEW = record
    Data: DWORD;
{   fShowAllObjects: BOOL:1;
    fShowExtensions: BOOL:1;
    fNoConfirmRecycle: BOOL:1;
    fShowSysFiles: BOOL:1;
    fShowCompColor: BOOL:1;
    fDoubleClickInWebView: BOOL:1;
    fDesktopHTML: BOOL:1;
    fWin95Classic: BOOL:1;
    fDontPrettyPath: BOOL:1;
    fShowAttribCol: BOOL:1;
    fMapNetDrvBtn: BOOL:1;
    fShowInfoTip: BOOL:1;
    fHideIcons: BOOL:1;
    fWebView: BOOL:1;
    fFilter: BOOL:1;
    fShowSuperHidden: BOOL:1;
    fNoNetCrawling: BOOL:1;}

    dwWin95Unused: DWORD;// Win95 only - no longer supported pszHiddenFileExts
    uWin95Unused: UINT; // Win95 only - no longer supported cbHiddenFileExts

    // Note: Not a typo!  This is a persisted structure so we cannot use LPARAM
    lParamSort: Integer;
    iSortDirection: Integer;
    version: UINT;

    // new for win2k. need notUsed var to calc the right size of ie4 struct
    // FIELD_OFFSET does not work on bit fields
    uNotUsed: UINT;// feel free to rename and use}

    Data2: DWORD;
{   fSepProcess: BOOL:1;

    // new for Whistler.
    fStartPanelOn: BOOL:1;
    fShowStartPage: BOOL:1;

    // new for Windows Vista
    fAutoCheckSelect: BOOL:1;
    fIconsOnly: BOOL:1;
    fShowTypeOverlay: BOOL:1;

    // If you need a new flag, steal a bit from from fSpareFlags.
    // Also, keep SHELLFLAGSTATE and SHGetSettings in sync when adding new flags.
    fSpareFlag: UINT:13;}
  end;

, :

var
  lpss: tagSHELLSTATEW;
begin
  ZeroMemory(@lpss, SizeOf(lpss));
  SHGetSetSettings(lpss, SSF_SORTCOLUMNS, False);

Answer 3

TShellState Delphi 2010:

type
  tagSHELLSTATEW = record 
    Data: DWORD;
    Data2: UINT;
{   fShowAllObjects: BOOL:1;
    fShowExtensions: BOOL:1;
    fNoConfirmRecycle: BOOL:1;
    fShowSysFiles: BOOL:1;
    fShowCompColor: BOOL:1;
    fDoubleClickInWebView: BOOL:1;
    fDesktopHTML: BOOL:1;
    fWin95Classic: BOOL:1;
    fDontPrettyPath: BOOL:1;
    fShowAttribCol: BOOL:1;
    fMapNetDrvBtn: BOOL:1;
    fShowInfoTip: BOOL:1;
    fHideIcons: BOOL:1;
    fWebView: BOOL:1;
    fFilter: BOOL:1;
    fShowSuperHidden: BOOL:1;
    fNoNetCrawling: BOOL:1;}

    //dwWin95Unused: DWORD;// Win95 only - no longer supported pszHiddenFileExts
    //uWin95Unused: UINT; // Win95 only - no longer supported cbHiddenFileExts

    // Note: Not a typo!  This is a persisted structure so we cannot use LPARAM
    lParamSort: Integer;
    iSortDirection: Integer;
    version: UINT;

    // new for win2k. need notUsed var to calc the right size of ie4 struct
    // FIELD_OFFSET does not work on bit fields
    uNotUsed: UINT;// feel free to rename and use
{   fSepProcess: BOOL:1;

    // new for Whistler.
    fStartPanelOn: BOOL:1;
    fShowStartPage: BOOL:1;

    // new for Windows Vista
    fAutoCheckSelect: BOOL:1;
    fIconsOnly: BOOL:1;
    fShowTypeOverlay: BOOL:1;

    // If you need a new flag, steal a bit from from fSpareFlags.
    // Also, keep SHELLFLAGSTATE and SHGetSettings in sync when adding new flags.
    fSpareFlags: UINT:11;
}

  end;
  {$EXTERNALSYM tagSHELLSTATEW}
  SHELLSTATEA = tagSHELLSTATEW;
  {$EXTERNALSYM SHELLSTATEA}
  SHELLSTATEW = tagSHELLSTATEW;
  {$EXTERNALSYM SHELLSTATEW}
  SHELLSTATE = SHELLSTATEW;
  {$EXTERNALSYM SHELLSTATE}
  TShellState = SHELLSTATE;
  PShellState = ^TShellState;

const
  SHELLSTATEVERSION_IE4 = 9; 
  {$EXTERNALSYM SHELLSTATEVERSION_IE4}
  SHELLSTATEVERSION_WIN2K = 10; 
  {$EXTERNALSYM SHELLSTATEVERSION_WIN2K}

, .

Answer 4

Afaik C . , C, , (, , boundery). , C sizeof .

, 1 + 6 + 1 sizeof (integer) = 32 .

Answer 5

I'm a little late to the party, but this article explains the beatons pretty well and has several approaches for Delphi.