使用 GetProcessImageFileNameW 时出现未初始化的 LPWSTR 错误

Question

I am trying to use GetProcessImageFileNameW in a Windows kernel driver.

    LPWSTR path[MAX_PATH];
    if(GetProcessImageFileNameW(hProcess, path, MAX_PATH) == 0)
    {
        DbgPrint("Can't get the process image name");
        return;
    }

But when I build there is a compiler error "Using uninitialized memory 'path'"

How can I solve it?

Answer 1

LPWSTR is a single wchar_t* pointer. So LPWSTR path[MAX_PATH]; is creating an array of wchar_t* pointers.

However, GetProcessImageFileNameW() takes an LPWSTR parameter, where the documentation says:

lpImageFileName

A pointer to a buffer that receives the full path to the executable file.

That means GetProcessImageFileNameW() wants a pointer to an array of wchar_t characters, which it will then fill as needed.

An array decays into a pointer to its 1st element. So, you are passing a wchar_t** where a wchar_t* is expected. I'm surprised you are not getting a compiler error about a type mismatch, rather than an error about uninitialized memory.

Try this instead:

WCHAR path[MAX_PATH] = {};
if (!GetProcessImageFileNameW(hProcess, path, MAX_PATH))
{
    DbgPrint("Can't get the process image name");
    return;
}