问不使用ExtractIconEx从EXE中提取所有图标

EN

unit ExtractIconUtils;

interface

uses Graphics,Forms,Windows;

//----------------------------------------------------------------------------
// ExtractIcons
// Call "private" MS Api to extract Icon file. This calls a publically
// documented function marked as deprecated in the MSDN documentation.
// It was no doubt Not Originally Intended to be documented, or publically
// accessed, but it provides functionality that its hard to live without.
// It exists on Windows 2000, XP, Vista, and Windows7, but might not exist
// in some future Windows version (released after year 2011).
//
// uses global   hUserDll    : THandle;
//----------------------------------------------------------------------------
function ExtractIcons(exeFilename,icoOutFileName:String;icoSize:Integer):Boolean;



var
  hUserDll    : THandle;





implementation



function ExtractIcons(exeFilename,icoOutFileName:String;icoSize:Integer):Boolean;
const
{$ifdef UNICODE}
 ExtractProcName='PrivateExtractIconsW';
{$else}
 ExtractProcName='PrivateExtractIconsA';
{$endif}
type
  TExtractFunc = function(lpszFile: PChar; nIconIndex, cxIcon, cyIcon: integer; phicon: PHANDLE; piconid: PDWORD; nicon, flags: DWORD): DWORD; stdcall;
var
  hIcon   : THandle;
  nIconId : DWORD;
  Icon    : TIcon;
  PrivateExtractIcons:TExtractFunc;
begin
  result := false;
  if (hUserDll<4) then begin
    hUserDll := LoadLibrary('user32.dll');
    if (hUserDll<4) then exit;
  end;

     { PrivateExtractIcons:
        MSDN documentation says that this function could go away in a future windows
        version, so we must try to load it, and if it fails, return false, rather than
        doing a static DLL import.
     }
    PrivateExtractIcons :=     GetProcAddress(hUserDll, ExtractProcName);

    if not Assigned(PrivateExtractIcons) then exit;

    //extract a icoSize x icoSize  icon where icoSize is one of 256,128,64,48,32,16
    if PrivateExtractIcons ( PWideChar(exeFilename),
                            0, icoSize, icoSize, @hIcon, @nIconId, 1, LR_LOADFROMFILE) <>0 then
    try
      Icon:=TIcon.Create;
      try
        Icon.Handle:=hIcon;
        Icon.SaveToFile(icoOutFileName);
        result := true;
      finally
        Icon.Free;
      end;
    finally
      DestroyIcon (hIcon);
    end;
end ;


initialization
  // none

finalization
   if (hUserDll>4) then
      FreeLibrary(hUserDll);

end.