Read the whole process memory into a buffer in C++

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i want to suspend and read a processes whole memory into a byte buffer. How can i do that? Also how to calculate the memory size? Im thinking to use ReadProcessMemory

Thanks

Virtual memory is not often contiguous. (That's actually the point.) Thus, it doesn't really make sense, and may be indeed impossible, to copy a process' entire virtual memory space into a single contiguous buffer. There will be gaps in virtual memory that will have to be filled with some value in the buffer. These gaps could be large, and the buffer could be huge.

Tools that do this sort of thing (e.g. for forensic purposes) often save off ranges of memory, with metadata indicating the source virtual memory addresses for later re-assembly.

Windows

You can first use VirtualQueryEx to discover the virtual memory ranges of the target process.

See this question: Enumerate the pages in a memory range

Then use ReadProcessMemory to copy data from the remote process' virtual memory into a buffer in your local process.

Of course, none of these actions are atomic. If the target process is running, the virtual memory space could change while you are working.

There are "tool help" APIs available as well: Taking a Snapshot and Viewing Processes

Advances in Image and Video Technology: 5th Pacific Rim Symposium, , A flowchart of the whole process of motion data compression is shown in Fig. different situation and how to assign MV(s) that has/have been read from buffer. As a summary, the memory size of the proposed method is bigger than (a) (b) (​c) (d) (e) (f) Intra Intra Intra Intra Read Selected MVs Temporal MV Buffer Write Fig. If you want to read the entire contents of a file into a buffer in memory, then the best way to do it is to map the file into memory, using mmap on Unix, or CreateFileMapping and MapViewOfFile on Windows. This has a bunch of advantages over the approach in the post: It's fast: the memory copy (in the fread) is avoided.

It sounds like you're looking for MiniDumpWriteDump and associated functions. Don't invent the wheel yourself.

Just Java 2, The whole point of mapped I/O is faster I/O. When transferring large amounts of data, I/O avoids the extra copying from buffers in kernel memory into buffers in your process. When you read with a stream, the OS reads from the disk into a buffer owned by of the ANSI C API, which is one of the most widely used I/O APIs. Often the only way to deal with text, especially when it contains numeric values in unknown locations is to read it in a single block, as shown here, or read it in small chunks and use a technique called "parsing". This reference shows how an entire text file can be read into memory. Parsing is dealt with in another web page.

You can find a solution easily on the google, like I found a few months ago. But in short you can achieve this with EnumProcesses, GetProcessMemoryInfo nad GetProcessImageFileName functions.

the list of process identifiers you can get like this:

DWORD adwProcesses[1024], dwNeeded, dwProcesses;
if (!EnumProcesses(adwProcesses, sizeof(adwProcesses), &dwNeeded)) { return 1; }

where you get all process identifiers. So you need know the exact number, how many processes were returned

dwProcesses = dwNeeded / sizeof(DWORD);

print or save the memory usage for as many times as many processes you have

HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, adwProcesses[k]);
PROCESS_MEMORY_COUNTERS pmc;
//Get process memory info and path to process
GetProcessMemoryInfo(hProcess, &pmc, sizeof(pmc));
GetProcessImageFileName(hProcess, szProcessName, sizeof(szProcessName) / sizeof(TCHAR));

so you get data for process path:

strProcessName.Format(_T("PATH: %s"), szProcessName);

page file memory usage:

strProcessPFMemory.Format(_T("%u K"), (pmc.PagefileUsage / 1024));

peak page file memory usage:

strProcessPPFMemory.Format(_T("%u K"), (pmc.PeakPagefileUsage / 1024));

and so on.

iOS and macOS Performance Tuning: Cocoa, Cocoa Touch, Objective-C, , Cocoa, Cocoa Touch, Objective-C, and Swift Marcel Weiher. NSData to use read​(), seemingly contradicting my earlier claim that using Unix system using NSData or malloc(), actually trumps the cost of bcopy()ing the memory into those buffers. The part not requested by the process simply goes into the buffer cache. What is a good approach to read the whole file content in a buffer for C++? While in plain C I could use fopen(), fseek(), fread() function combination and read the whole file to a buffer, is it s Stack Overflow

ReadProcessMemory function (memoryapi.h), The entire area to be read must be accessible or the operation fails. C++. Copy​. BOOL ReadProcessMemory( HANDLE hProcess, LPCVOID A handle to the process with memory that is being read. A pointer to a buffer that receives the contents from the address space of the specified process. nSize. Using memcpy will enable the entire structure to be copied into a buffer. For eg., contents of 'ob1' are copied into 'buffer' in the following code:

C: Reading data from a file using fread(), Let's look at each of them in detail: Buffer: Pointer to the buffer where data will be stored. A buffer is a region of memory used to temporarily store data; Size: The  process(buffer); You might want to change this to 'process(buffer, count);' to make sure you don't process invalid data. While the buffer will always be of the same size it might only be the first byte that is valid, the rest is junk left from the last read. delete buffer;} --Erik Wikström

Buffer overflow, On many systems, the memory layout of a program, or the system as a whole, is well defined. By sending in data designed to cause a buffer overflow, it is possible  Today’s tutorial is about…processes’ memory! In this article I’ll show you how to read/write a process’ memory using C#. This is a good way to learn a part of WinAPI and also understand the basics of memory allocation. I’ll be considering a fixed (known) memory address for reading and writing just for the sake of simplicity; feel free to also read how to [scan a process’ memory

Comments
  • If you have a particular operating system in mind, it's probably worth adding that to the question. This is going to be very platform-specific.
  • is there any way to get the dump files content without writing onto the disk?