Why Does My Go Code Fail When Using GetVolumeInformation with unsafe.Pointer?

Call GetVolumeInformation WinAPI Function in Go

Problem:

In attempting to retrieve the volume name using the GetVolumeInformation WinAPI function, the code fails with an unexpected fault error.

Answer:

The error stems from using unsafe.Pointer incorrectly. Specifically, the & operator should be removed from the variable names when converting to unsafe.Pointer.

Solution:

Modify the code as follows to address the pointer issues:

<code class="go">var nVolumeNameSize = uint32(len(VolumeNameBuffer))
ret, _, callErr := syscall.Syscall9(uintptr(getVolume),
    nargs,
    uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(RootPathName))),
    uintptr(unsafe.Pointer(&VolumeNameBuffer[0])),
    uintptr(nVolumeNameSize),
    uintptr(unsafe.Pointer(&VolumeSerialNumber)),
    uintptr(unsafe.Pointer(&MaximumComponentLength)),
    uintptr(unsafe.Pointer(&FileSystemFlags)),
    uintptr(unsafe.Pointer(&FileSystemNameBuffer[0])),
    uintptr(nFileSystemNameSize),
    0)</code>

This revised code correctly passes the appropriate pointers, eliminating the fault error and allowing the retrieval of the volume name.

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