--- title: "GDI Usage Errors" layout: default permalink: /page_gdi.html ---

Dr. Memory

GDI Usage Errors

On Windows, Dr. Memory identifies common errors in using the Windows GDI API. For example:

Error #15: GDI Usage Error: DC 0x2d011230 that contains selected object being deleted
# 0 system call NtGdiDeleteObjectApp
# 1 GDI32.dll!DeleteDC +0x11 (0x76b458c5 <GDI32.dll+0x158c5>)
# 2 chrome.dll!skia::BitmapPlatformDevice::BitmapPlatformDeviceData::ReleaseBitmapDC [c:\src\chromium\src\skia\ext\bitmap_platform_device_win.cc:58]
# 3 chrome.dll!SkRefCnt::unref [c:\src\chromium\src\third_party\skia\include\core\skrefcnt.h:60]
# 4 chrome.dll!SkRefCnt::unref [c:\src\chromium\src\third_party\skia\include\core\skrefcnt.h:60]
# 5 chrome.dll!SkCanvas::internalRestore [c:\src\chromium\src\third_party\skia\src\core\skcanvas.cpp:824]
# 6 chrome.dll!SkCanvas::~SkCanvas [c:\src\chromium\src\third_party\skia\src\core\skcanvas.cpp:449]

Note that some of these GDI usage errors are best programming practices and may not result in detrimental behavior in actual usage on more recent versions of Windows, while others are more serious. Detection of these errors can be disabled with the `-no_check_gdi` runtime option.