How do I check if my app has 2 same processes running, C++

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C++

Windows

I have an app that starts another copy of itself, but after the application has started twice it should no longer start. It's a console application.

What I have tried:

I have tried to write this to check if my app is running 2 same proc.

void checkProcNumber(int cc ,const char* procfilename) {

	
	HANDLE hsnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
	PROCESSENTRY32 p32;
	p32.dwSize = sizeof(p32);
	BOOL hres = Process32First(hsnap, &p32);

	while (hres) {

		if (strcmp(p32.szExeFile, procfilename)==0) {

			cc ++;

		}

		hres = Process32Next(hsnap, &p32);
	}
	CloseHandle(hsnap);
}

And after, this to open the app (in the main)

TCHAR buffer[MAX_PATH] = { 0 };
	GetModuleFileName(NULL, buffer, MAX_PATH);
	string current_path = (buffer);
	ShellExecute(NULL, "open", current_path.c_str(), NULL, NULL, SW_HIDE);

and finally this:

int x = 0;
	checkProcNumber(x, "test.exe");
	if (x == 2) {

		cout << "finish";
                Sleep(1000)
//and other code to exit from app.

	}

The problem is that the application does not start twice, but runs indefinitely