ShellExecute(Ex) with 'properties' verb - c++

Question

I am trying to write a program, that opens the properties of a file, from the command-line. I read that it is possible to do, using either of the functions ShellExecute and ShellExecuteEx, with the 'properties' verb.
So, I wrote such a C++ program in Visual Studio for Windows 10. This is that program:
#include <windows.h>
#include <iostream>
void ShowFileProperties(char *);
int main(int argc, char **argv)
{
if (argc >= 2)
{
std::cout << argv[1] << std::endl;
ShowFileProperties(argv[1]);
}
std::cout << GetLastError();
return 0;
}
void ShowFileProperties(char *szPathName)
{
HRESULT result = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);
SHELLEXECUTEINFO Sei;
ZeroMemory(&Sei,sizeof(SHELLEXECUTEINFO));
Sei.cbSize = sizeof(SHELLEXECUTEINFO);
Sei.lpFile = szPathName;
Sei.nShow = SW_SHOW;
Sei.fMask = SEE_MASK_INVOKEIDLIST;
Sei.lpVerb = "properties";
ShellExecuteEx(&Sei);
if (result == S_OK || result == S_FALSE)
CoUninitialize();
}
If I run the program from the command line with a valid filename (such as . or the name of the executable itself), all it outputs is the filename and a zero (there was no error), but the properties of the file don't open.
Now, I have seen that other people have this problem, i.e. that the 'properties' verb doesn't do anything or that they get a messagebox saying that the filetype doesn't have an associated program for the operation, but I have not been able to find a fix.
Is there anyone here that can help me?
Thanks in advance.

Answer 1

Pass the SEE_MASK_NOASYNC (0x00000100) flag in your SHELLEXECUTEINFO to tell ShellExecuteEx that you're calling it without a message loop and not to return until it has finished.
See the remarks in the SHELLEXECUTEINFO docs on MSDN.
Sleep() is neither necessary nor recommended.