Windows API - Win32
A core set of Windows application programming interfaces (APIs) for desktop and server applications. Previously known as Win32 API.
2,523 questions
Detecting an x64 app running on ARM64
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(19.2, 28.999999999999996%, 11%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EFM%3C/text%3E%3C/svg%3E)
FredAaron-MSFT
1
Reputation point
I need to distinguish a x64 and ARM64 process running on Windows 10 or greater in C++. Calling IsWow64Process2 on the x64 process returns processMachine == IMAGE_FILE_MACHINE_UNKNOWN correctly indicating the process is not a wow process and nativeMachine == IMAGE_FILE_MACHINE_ARM64 correctly indicating this is an ARM64 system. In an example, the process architecture shown in Task manager says "ARM64 (x64 compatibility)" for the process. What is the preferred way to determine a process running is x64 and not ARM64?
Windows API - Win32
C++
C++
A high-level, general-purpose programming language, created as an extension of the C programming language, that has object-oriented, generic, and functional features in addition to facilities for low-level memory manipulation.
3,637 questions
{count} votes
-
Viorel 114.7K Reputation points2021-01-16T14:03:20.753+00:00 In addition, you could consider the __cpuid and __cpuidex intrinsic instructions. According to documentation, the “implementer” field is 0x41 in case of ARM.
-
Rita Han - MSFT 2,161 Reputation points2021-01-18T02:50:48.507+00:00 Hello @FredAaron-MSFT , if you are detecting the calling process architecture, could you try the following code and show the value of
headers->FileHeader.Machine?IMAGE_NT_HEADERS* headers = ImageNtHeader(GetModuleHandle(NULL)); -
FredAaron-MSFT 1 Reputation point
2021-02-11T23:45:33.997+00:00 Works like a charm, thanks for the suggestion.
Sign in to comment