handle = GetDefaultIcon(extension$) (windows only)

[Joakim Christiansen]

As the title says, it returns a handle to the default icon of any filetype. I didn't find such code laying around so I decided to share it, sharing is caring!
Edit: Actually srod's code below is even better.

Code: Select all

Procedure.s RegistryReadKey(hKey,path$,key$="")
  Protected lpData.s{128}, lpcbData = 128, Result${1024}
  If RegOpenKeyEx_(hKey,path$,#Null,#KEY_READ,@hKey) = #ERROR_SUCCESS
    If RegQueryValueEx_(hKey,key$,#Null,#Null,@lpData,@lpcbData) = #ERROR_SUCCESS
      Result$ = PeekS(@lpData,lpcbData)
    EndIf
    RegCloseKey_(hkey)
  EndIf
  ProcedureReturn Result$
EndProcedure
Procedure GetDefaultIcon(extension$)
  Protected program$, icon$, iconPath$, iconNumber, iconHandle
  program$ = RegistryReadKey(#HKEY_CLASSES_ROOT,"."+extension$)
  icon$ = RegistryReadKey(#HKEY_CLASSES_ROOT,program$+"\DefaultIcon")
  icon$ = RemoveString(icon$,#DQUOTE$)
  ;Debug program$+" "+icon$
  If CountString(icon$,",")
    iconPath$   = StringField(icon$,1,",")
    iconNumber  = Val(StringField(icon$,2,","))
  Else
    iconPath$  = icon$
    iconNumber = 0
  EndIf
  iconHandle = ExtractIcon_(0,iconPath$,iconNumber)
  ;ExtractIconEx_(iconPath$,iconNumber,0,@iconHandle,1): iconHandle = PeekL(@iconHandle)
  ProcedureReturn iconHandle ;remember to use DestroyIcon_() to clean up
EndProcedure

OpenWindow(0,0,0,100,50,"",#PB_Window_ScreenCentered|#PB_Window_SystemMenu)

icon = GetDefaultIcon("txt")
If icon
  StartDrawing(WindowOutput(0))
    DrawImage(icon,5,5)
  StopDrawing()
  DestroyIcon_(icon)
Else
  Debug "No icon found for this filetype."
EndIf

Repeat: Until WaitWindowEvent() = #PB_Event_CloseWindow

[srod]

Hi,

that doesn't work here for pdf files for some reason!!!

Here's the code I normally use :

Code: Select all

Define shInfo.SHFILEINFO

file$ = ".pdf"

If OpenWindow(0, 100, 200, 300, 200, "Icon!")
  If StartDrawing(WindowOutput(0))
    ;Large icon.
      SHGetFileInfo_(file$,#FILE_ATTRIBUTE_NORMAL,@shInfo,SizeOf(SHFILEINFO),#SHGFI_USEFILEATTRIBUTES|#SHGFI_ICON|#SHGFI_LARGEICON|#SHGFI_TYPENAME|#SHGFI_DISPLAYNAME) 
      If shInfo\hIcon
        DrawImage(shInfo\hIcon, 0, 0)
        DestroyIcon_(shInfo\hIcon)
      EndIf
    ;Small icon.
      SHGetFileInfo_(file$,#FILE_ATTRIBUTE_NORMAL,@shInfo,SizeOf(SHFILEINFO),#SHGFI_USEFILEATTRIBUTES|#SHGFI_ICON|#SHGFI_SMALLICON|#SHGFI_TYPENAME|#SHGFI_DISPLAYNAME) 
      If shInfo\hIcon
        DrawImage(shInfo\hIcon, 0, 40)
        DestroyIcon_(shInfo\hIcon)
      EndIf
    StopDrawing()
  EndIf
  Repeat
    EventID = WaitWindowEvent() 
  Until EventID = #PB_Event_CloseWindow
EndIf

[Kwai chang caine]

that doesn't work here for pdf files for some reason!!!

Hello SROD......it's me

Excuse your IDIOTMAN to contradict you, but the PDF works fine here, with the code of JOAKIM
For one time that something works with me and not for you

I have W2000, it's perhaps that :roll:

Thanks at you two for this good function

[srod]

I'm using Vista 32.

For pdf files, JC's code is retrieving, not a default program from which to extract the icon, but the ProgID (COM) "AcroExch.Document".

I think the SHGetFileInfo_() function is definitely the 'fool proof' way of doing this.

[Joakim Christiansen]

I think the SHGetFileInfo_() function is definitely the 'fool proof' way of doing this.

Yeah, thanks for sharing the code. Seems to retrieve more icons!
Btw srod, shouldn't you free up shInfo\hIcon with DestroyIcon_()?

[srod]

I think the SHGetFileInfo_() function is definitely the 'fool proof' way of doing this.

Yeah, thanks for sharing the code. Seems to retrieve more icons!
Btw srod, shouldn't you free up shInfo\hIcon with DestroyIcon_()?

Yep, you're absolutely right!

I've altered the code appropriately. Thanks.

[Joakim Christiansen]

Well, now I also made a handy function based on your example, and here is a little example (something to put in the code archive or whatever):

Code: Select all

EnableExplicit

Procedure GetDefaultIcon(extension$,small=#False)
  Protected shInfo.SHFILEINFO
  If small: small = #SHGFI_SMALLICON
  Else: small = #SHGFI_LARGEICON
  EndIf
  SHGetFileInfo_(extension$,#FILE_ATTRIBUTE_NORMAL,@shInfo,SizeOf(SHFILEINFO),#SHGFI_USEFILEATTRIBUTES|#SHGFI_ICON|small|#SHGFI_TYPENAME|#SHGFI_DISPLAYNAME)
  ProcedureReturn shInfo\hIcon ;remember to use DestroyIcon_() to clean up
EndProcedure

Define smallIcon = GetDefaultIcon(".exe",#True)
Define largeIcon = GetDefaultIcon(".exe")

If OpenWindow(0,0,0,180,50,"Default icon example",#PB_Window_ScreenCentered|#PB_Window_SystemMenu)
  If StartDrawing(WindowOutput(0))
    DrawImage(largeIcon,5,5)
    DrawImage(smallIcon,42,5)
    StopDrawing()
  EndIf
  Repeat: Until WaitWindowEvent() = #PB_Event_CloseWindow
EndIf 

DestroyIcon_(smallIcon)
DestroyIcon_(largeIcon)