Process snapshot can't be compared against wide strings - c++

Question

I have the following problem:
I want to keep track of the running processes by using CreateToolhelp32Snapshot and Process32First/Next. However I want to use the Unicode charset by default.
bool active( const std::wstring& process_name )
{
HANDLE snapshot = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );
if ( snapshot == INVALID_HANDLE_VALUE )
return false;
PROCESSENTRY32 entry;
if ( Process32First( snapshot, &entry ) )
{
if ( process_name.compare( entry.szExeFile ) == 0 )
{
CloseHandle( snapshot );
return true;
}
}
while ( Process32Next( snapshot, &entry ) )
{
if ( process_name.compare( entry.szExeFile ) == 0 )
{
CloseHandle( snapshot );
return true;
}
}
CloseHandle( snapshot );
return false;
}
int main( )
{
SetConsoleTitle( L"Lel" );
if ( active( L"notepad++.exe" ) )
std::cout << "Hello" << std::endl;
else
std::cout << ":(" << std::endl;
}
However, if I use multibyte-charset everything's working fine.

Answer 1

You must initialize entry and set dwSize value. dwSize value is Windows's idea of version control and is required:
PROCESSENTRY32 entry = { 0 };
entry.dwSize = sizeof(PROCESSENTRY32);
Comparison should not be case sensitive:
while (Process32Next(snapshot, &entry))
{
if (_wcsicmp(process_name.c_str(), entry.szExeFile) == 0)
{
CloseHandle(snapshot);
return true;
}
}