Edit: I rephrased my question, please ignore all of the comments below (up to the 7th of May).
First off, I'll try to explain the problem:
My process is trying to show a Deskband programmatically using ITrayDeskBand::ShowDeskBand.
It works great at any time except for when the OS is loading all of its processes (after reset or logout).
After Windows boots and starts loading the various applications\services, the mouse cursor is set to wait for a couple of seconds (depends on how many applications are running \ how fast everything is).
If the mouse cursor is set to wait and the process is running during that time, the call will fail.
However, if my process waits a few seconds (after that time the cursor becomes regular) and then invokes the call, everything works great.
This behavior was reproduced both on Windows 7 and Windows Vista.
So basically what I'm asking is :
1) Just for basic knowledge, What the OS does when the cursor is set to busy?
2) The more important question : How can i detect programmatically when this process is over?
At first, I thought that explorer hadn't loaded properly so I've used WaitForInputIdle but it wasn't it.
Later I thought that the busy cursor indicates that the CPU is busy so I've created my process using IDLE_PRIORITY_CLASS but idle times were received while the cursor was busy.
Windows never stops loading applications and/or services!
As a matter of fact, applications come and go, some of these interactively some of these without any user interaction. Even Services are loaded at different points of time (depending on their settings and the external conditions - e.g the Smard Card Resource Manager Service might start only when the OS detects that a Smard Card device has connected). Applications can (but must not) stop automatically so do some Services.
One never knows when Windows has stop to load ALL applications and/or Services.
If ITrayDeskBand::ShowDeskBand fails, then wait for the TaskbarCreated message and then try again. (This is the same technique used by notification icons.)
The obvious approach would be to check whether ShowDeskband worked or not, and if not, retry it after a few seconds. I'm assuming you've already considered and rejected this option.
Since you seem to have narrowed down the criteria to which cursor is being displayed, how about waiting for the particular cursor you are wanting? You can find which cursor is being shown like this:
CURSORINFO cinfo;
ICONINFOEX info;
cinfo.cbSize = sizeof(cinfo);
if (!GetCursorInfo(&cinfo)) fail();
info.cbSize = sizeof(info);
if (!GetIconInfoEx(cinfo.hCursor, &info)) fail();
printf("szModName = %ws\n", info.szModName);
printf("wResID = %u\n", info.wResID);
Most of the simple cursors are in module USER32. The relevant resource IDs are listed in the article on GetIconInfo.
You apparently want to wait for the standard arrow cursor to appear. This is in module USER32, and the resource ID is 32512 (IDC_ARROW).
I suggest that you check the cursor type ten times a second. When you see the arrow cursor ten times in a row (i.e., for a full second) it is likely that Explorer has finished starting up.
