PureBasic

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GdiplusNotificationHook
GdiplusNotificationUnHook

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Procedure DebugCallback(DebugEventLevel.l, *message)

; *DebugEventProc)(DebugEventLevel level, CHAR *message)

EndProcedure

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  #DebugEventLevelFatal = 0 
  #DebugEventLevelWarning = 1

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ProcedureDLL.l Gdiplus_New(version.l = 1, *hEventCB = #Null, Codecs.l = #False, bgThread.l = #False)
  Protected *token, input.GdiplusStartupInput
  input\GdiPlusVersion = version
  input\DebugEventCallback = *hEventCB
  input\SuppressExternalCodecs = Codecs
  input\SuppressBackgroundThread = bgThread
  GdiplusStartup(@*token, @input, #Null)
  GdiplusNotificationHook(*token)
  GdiplusNotificationUnhook(*token)
  ProcedureReturn *token
EndProcedure

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Prototype.l DebugEventProc(level.l, message.p-unicode)

ProcedureDLL.l Gdiplus_New(version.l = 1, Codecs.l = #False, bgThread.l = #False)
  Protected *token, input.GdiplusStartupInput
  input\GdiPlusVersion = version
  input\DebugEventCallback = @DebugEventProc(level, message)
  input\SuppressExternalCodecs = Codecs
  input\SuppressBackgroundThread = bgThread
  GdiplusStartup(@*token, @input, #Null)
  GdiplusNotificationHook(*token)
  GdiplusNotificationUnhook(*token)
  ProcedureReturn *token
EndProcedure

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  ; init Gdi+
  input\GdiPlusVersion = 1
  input\DebugEventCallback = @DebugCallback()  ; to try with debug callback
  input\SuppressExternalCodecs = #False 
  input\SuppressBackgroundThread = #True    ; here to get hooks pointers
;  GdiplusStartup(@*token, *input.GdiplusStartupInput, *output.GdiplusStartupOutput) 
   GdiplusStartup(@*token, @input, @output)    ; call init function

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Structure GdiplusStartupInput ;{
  GdiPlusVersion.l 
  *DebugEventCallback.DebugEventProc 
  SuppressBackgroundThread.l 
  SuppressExternalCodecs.l 
EndStructure

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GdiPlusInit.h also says:

"// Callback function that GDI+ can call, on Debug builds, For assertions
// And warnings.
typedef VOID (WINAPI *DebugEventProc)(DebugEventLevel level, CHAR *message);

// Notification functions which the user must call appropriately If
// "SuppressBackgroundThread" (below) is set.

typedef Status (WINAPI *NotificationHookProc)(OUT ULONG_PTR *token);
typedef VOID (WINAPI *NotificationUnhookProc)(ULONG_PTR token);

Does this mean you don't need the call back except for debug builds?


struct GdiplusStartupInput
{
    UINT32 GdiplusVersion;             // Must be 1  (or 2 for the Ex version)
    DebugEventProc DebugEventCallback; // Ignored on free builds
    BOOL SuppressBackgroundThread;     // FALSE unless you're prepared to call 
                                       // the hook/unhook functions properly
    BOOL SuppressExternalCodecs;       // FALSE unless you want GDI+ only to use
                                       // its internal image codecs.
    
    GdiplusStartupInput(
        DebugEventProc debugEventCallback = NULL,
        BOOL suppressBackgroundThread = FALSE,
        BOOL suppressExternalCodecs = FALSE)
    {
        GdiplusVersion = 1;
        DebugEventCallback = debugEventCallback;
        SuppressBackgroundThread = suppressBackgroundThread;
        SuppressExternalCodecs = suppressExternalCodecs;
    }
};

where DebugEventProc debugEventCallback = NULL, and suppressBackgroundThread = #FALSE

and...the GdiplusStartupOutput structure looks like this

struct GdiplusStartupOutput
{
    // The following 2 fields are NULL If SuppressBackgroundThread is FALSE.
    // Otherwise, they are functions which must be called appropriately To
    // replace the background thread.
    //
    // These should be called on the application's main message loop - i.e.
    // a message loop which is active For the lifetime of GDI+.
    // "NotificationHook" should be called before starting the loop,
    // And "NotificationUnhook" should be called after the loop ends.
    
    NotificationHookProc NotificationHook;
    NotificationUnhookProc NotificationUnhook;
};

see where it says: "These should be called on the application's main message loop - i.e. a message loop which is active For the lifetime of GDI+. "NotificationHook" should be called before starting the loop,  and "NotificationUnhook" should be called after the loop ends.

so...would it look like this?: (pseudo code)

GdiplusStartup
NotificationHook
App Message Loop
NotificationUnhook
GdiplusShutdown(*token)