What is CreateToolhelp32Snapshot?

What is CreateToolhelp32Snapshot?

CreateToolhelp32Snapshot creates a snapshot of what is running on the computer the moment the function is called. Depending on the flags specified, this snapshot can include running processes and/or threads, among other things.

What is a snapshot C++?

A snapshot is the state of something at a given point in time. After you create the snapshot, new processes may start or old processes may end, but those changes will not be reflected in your snapshot.

What is Process32First?

Process32First retrieves information about the first process in the process list contained in a system snapshot. This snapshot must have previously been generated using the CreateToolhelp32Snapshot function.

What is tlhelp32 H?

Takes a snapshot of the specified processes, as well as the heaps, modules, and threads used by these processes. Heap32First. Retrieves information about the first block of a heap that has been allocated by a process.

What is CreateRemoteThread?

The CreateRemoteThread function causes a new thread of execution to begin in the address space of the specified process. The thread has access to all objects that the process opens. If a security descriptor is not provided, the handle may be used in any function that requires a thread object handle.

What is EnumWindows?

Enumerates all top-level windows on the screen by passing the handle to each window, in turn, to an application-defined callback function. EnumWindows continues until the last top-level window is enumerated or the callback function returns FALSE.

What is a snapshot process?

It is similar to the Tool Help API, but with one important advantage: it can efficiently capture the virtual address contents of a process using the Windows internal POSIX fork clone capability. The process snapshot can be dumped into a file using the MiniDumpWriteDump function.

What is the function of snapshot?

A snapshot of a snapshot. Creates a backup of a snapshot that was written into. Taking a snapshot of a writable snapshot is similar to taking a snapshot of a volume.

What is dwSize?

dwSize. The size of the structure, in bytes. Before calling the Process32First function, set this member to sizeof(PROCESSENTRY32). If you do not initialize dwSize, Process32First fails.

What is Psapi H?

GetModuleInformation function (psapi.h) – Win32 apps Retrieves information about the specified module in the MODULEINFO structure.

What is SetWindowsHookEx?

SetWindowsHookEx. Installs an application-defined hook procedure into a hook chain. You would install a hook procedure to monitor the system for certain types of events. These events are associated either with a specific thread or with all threads in the same desktop as the calling thread.

What is Lpthread_start_routine?

LPTHREAD_START_ROUTINE is actually documented under the name of ThreadProc : An application-defined function that serves as the starting address for a thread. Specify this address when calling the CreateThread , CreateRemoteThread , or CreateRemoteThreadEx function.

What happens if the createtoolhelp32snapshot function fails?

If the specified process is a 64-bit process and the caller is a 32-bit process, this function fails and the last error code is ERROR_PARTIAL_COPY (299). If the function succeeds, it returns an open handle to the specified snapshot. If the function fails, it returns INVALID_HANDLE_VALUE.

How to create a snapshot handle in Win32?

The snapshot handle acts as an object handle and is subject to the same rules regarding which processes and threads it is valid in. To enumerate the heap or module states for all processes, specify TH32CS_SNAPALL and set th32ProcessID to zero.

When to use zero in tlhelp32snapshot function?

This parameter can be zero to indicate the current process. This parameter is used when the TH32CS_SNAPHEAPLIST, TH32CS_SNAPMODULE, TH32CS_SNAPMODULE32, or TH32CS_SNAPALL value is specified. Otherwise, it is ignored and all processes are included in the snapshot.

How to destroy a 32 bit snapshot in Win32?

To destroy the snapshot, use the CloseHandle function. Note that you can use the QueryFullProcessImageName function to retrieve the full name of an executable image for both 32- and 64-bit processes from a 32-bit process. For an example, see Taking a Snapshot and Viewing Processes.