On Sep 10, 2009, at 12:34 PM, David Duncan wrote:
On Sep 10, 2009, at 7:32 AM, Jason Foreman wrote:CGImageRef screenShot = CGWindowListCreateImage(CGRectInfinite, kCGWindowListOptionOnScreenOnly, kCGNullWindowID, kCGWindowImageDefault);
On Snow Leopard, the CGImageRef is NULL and the following message is printed to the console:<Error>: CGImageCreate: invalid image bits/pixel or bytes/row.
Your bug will end up dup'd to <rdar://problem/7022171>. The basic problem is using CGRectInfinite from a 32-bit process when the Window Server is running as a 64-bit process – when the rect comes out at the other end it is no longer interpreted as "infinite" but rather as "very very large". Since you can't create an image that large, the creation code fails and you get back a NULL CGImageRef instead.The current best work around is to determine a proper bounding box for the desktop and pass it for the given rect.
Thanks David, your suggestion works great. I appreciate the quick response.
For the benefit of the archives and anyone else having a similar issue, here is how I calculate the bounding box:
NSRect desktopRect = NSZeroRect;
for (NSScreen *screen in [NSScreen screens])
{
desktopRect = NSUnionRect(desktopRect, [screen frame]);
}
This seems to give me exactly what I want when passed to
CGWindowListCreateImage.
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