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- WINDOWS GRAPHICS PROGRAMMING WIN32 GDI AND DIRECTDRAW HOW TO
- WINDOWS GRAPHICS PROGRAMMING WIN32 GDI AND DIRECTDRAW DRIVER
- WINDOWS GRAPHICS PROGRAMMING WIN32 GDI AND DIRECTDRAW PATCH
Unlike Windows 9 x, however, a Windows XP GDI object handle is a full 32-bit value. The Windows 9 x version of GDIUsage uses the GetObjectType API function which provides the type of GDI object for a given handle value to check if a random value is a valid GDI handle.
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Since Windows keeps a record of GDI objects on a per-process basis, only the application that created a GDI object is able to use the corresponding GDI functions with it. Win32 applications call these system services through the API provided by user32.dll and gdi32.dll.
WINDOWS GRAPHICS PROGRAMMING WIN32 GDI AND DIRECTDRAW DRIVER
With Windows XP, a list of GDI objects is associated with each process, mostly managed in kernel mode by win32k.sys, the device driver responsible for USER and GDI implementation.
WINDOWS GRAPHICS PROGRAMMING WIN32 GDI AND DIRECTDRAW HOW TO
Following that, I will show you how to write a Win32® debugger to drive a process, how to let the process and the debugger communicate with each other, and how to implement a call stack manager to provide additional information about GDI object's resource allocation.
WINDOWS GRAPHICS PROGRAMMING WIN32 GDI AND DIRECTDRAW PATCH
I'll explain how to determine the GDI resource consumption for a process using a code injection mechanism and how to patch a process or a DLL to be notified when a GDI object is created. This article describes the differences between Windows 9 x and the Windows XP platforms and suggests some solutions to solve the problems that arise during the implementation of the tool that you will see in Figure 1. The same method that I will use here will apply equally well to Windows 2000 and Windows NT® 4.0, but for the purposes of this article, I will use Windows XP to represent all three platforms. This article will show you how to write the same kind of tool for Windows XP. In the March 2001 issue of MSDN® Magazine, I explained how to take advantage of the 16-bit side of these platforms to build GDIUsage, a tool that lists, compares, and displays the GDI objects used by all applications (see " Resource Leaks: Detecting, Locating, and Repairing Your Leaky GDI Code"). In Windows® 95, Windows 98, and Windows Me, a graphics device interface (GDI) handle is a 16-bit value, and any application can use it to call functions from the GDI API. Injecting Running Code into Another Process Using Stack Tracing to Monitor Allocations Tracking Object Allocation with API Hooking He builds and explains two tools designed to detect and eradicate GDI leaks in applications running on Windows XP, Windows 2000, and Windows NT. Because some newer versions of Windows require a slightly different approach to GDI leaks, the author has updated his techniques for those operating systems. In a previous article, the author devised a simple method to detect Graphical Device Interface (GDI) objects that are not properly released by Win32-based applications on Windows 9 x platforms. This article assumes you're familiar with Win32 and C#
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Detect and Plug GDI Leaks in Your Code with Two Powerful Tools for Windows XPĬode download available at: GDILeaks.exe(13,279 KB)