Ciao Ospite, Se sei già iscritto al forum effettua l'accesso con la tua user e password Clicca qui . Se leggi questo messaggio significa che non sei registrato. Clicca qui per effettuare la registrazione in pochi semplici passaggi e potrai usufruire di tutte le funzioni del nostro Forum . Ti ricordiamo che sono vietati nick volgari o privi di senso (no numeri o lettere a caso) e di passare in Area Benvenuti per presentarti al Forum Interestingly, explicitly added GetSystemTimePreciseAsFileTime to kernel32.dll for Windows 7 SP1 and Windows Server 2008 R2 SP1.
: Implement a check to use GetSystemTimeAsFileTime (the standard version) if the OS is older than Windows 8.
of the software that still support Windows 7. For iperf3, versions 3.14 and 3.16 are known to work reliably.
HMODULE hKernel32 = GetModuleHandleA("kernel32.dll"); FARPROC pFunc = GetProcAddress(hKernel32, "GetSystemTimePreciseAsFileTime"); getsystemtimepreciseasfiletime windows 7 upd
For greenfield development, targeting Windows 10 or Windows 11 eliminates these compatibility concerns entirely – GetSystemTimePreciseAsFileTime is always available with full precision.
If you want, I can produce a small copy-pasteable C/C++ example implementing dynamic lookup plus a QPC-based high-resolution fallback with periodic resync.
The lack of native GetSystemTimePreciseAsFileTime in Windows 7 once forced developers into messy workarounds. However, with , Microsoft officially back-ported this essential function, allowing legacy systems to achieve near-microsecond timestamp resolution. For iperf3, versions 3
Replace GetSystemTimePreciseAsFileTime with GetSystemTimeAsFileTime for older Windows versions.
Many users ask: "The app worked perfectly last week, why is it complaining about a missing Windows 8 API after a minor update today?"
: Developers often update their tools (like Visual Studio ) to use modern APIs, which can accidentally break compatibility with Windows 7. Microsoft officially back-ported this essential function
The short answer is . There is no official Windows 7 update from Microsoft that adds GetSystemTimePreciseAsFileTime to the operating system. This is not a missing service pack or hotfix—it's a fundamental API that was never backported to Windows 7.
Verify your system has Windows 7 Service Pack 1 installed. Solution 3: Workarounds for Developers and Power Users
. Community projects like VxKex can sometimes provide missing API implementations.
If you are developing the software, you must enable compatibility for older systems.
