C / C++ / MFC

Victor Nijegorodov wrote:

...rather than to search for a letter in the returned path

WCHAR letter = L'A' + PathGetDriveNumberW(windowsDir);

int PathGetDriveNumberA(
  LPCSTR pszPath
);

jackngill wrote:

does this help in any way?

// Gets the home drive - %HOMEDRIVE% (possible HOMEDRIVE is related to Windows7)
// Typical value - C:
Console::WriteLine("Get Environment Variable: Home Drive " + Environment::GetEnvironmentVariable("HOMEDRIVE"));

SetSfcFileException(0, L"c:\\windows\\system32\\calc.exe",-1);

SetSfcFileException(0, L"HOMEDRIVE:\\windows\\system32\\calc.exe",-1);

jackngill wrote:

I have been researching further & I have found this snippet of code from (To reveal the source click on the link below)
C++/CLI Code Snippet - Access current environment directories and logical drives[^]

TCHAR buffer[30] = {0};
    if (::GetEnvironmentVariable(_T("SYSTEMDRIVE"), buffer, _countof(buffer)))
    {
        TCHAR path[MAX_PATH] = {0};
        _stprintf(path, _T("%s\windows\system32\calc.exe"), buffer);
        TRACE(path); // just to be sure it is what we supposed...
        SetSfcFileException(0, path, -1);
    }

Compilation failed due to following error(s). main.cpp:1:8: error: expected unqualified-id before ‘,’ token
 wchar_t, _T() buffer[30] = {0};
        ^
main.cpp:1:15: error: expected initializer before ‘buffer’
 wchar_t, _T() buffer[30] = {0};
               ^~~~~~
main.cpp:2:5: error: expected unqualified-id before ‘if’
     if (::GetEnvironmentVariable(_T("SYSTEMDRIVE"), buffer, _countof(buffer)))
     ^~

wchar_t, _T() buffer[30] = {0};
    if (::GetEnvironmentVariable(_T("SYSTEMDRIVE"), buffer, _countof(buffer)))
    {
        wchar_t, _T() path[MAX_PATH] = {0};
        swprintf(path, _T("%s\windows\system32\calc.exe"), buffer);
        TRACE(path); // just to be sure it is what we supposed...
        SetSfcFileException(0, path, -1);
    }

jackngill wrote:

Compilation failed due to following error(s). main.cpp:1:8: error: expected unqualified-id before ‘,’ token
 wchar_t, _T() buffer[30] = {0};
        ^
main.cpp:1:15: error: expected initializer before ‘buffer’
 wchar_t, _T() buffer[30] = {0};
               ^~~~~~
main.cpp:2:5: error: expected unqualified-id before ‘if’
     if (::GetEnvironmentVariable(_T("SYSTEMDRIVE"), buffer, _countof(buffer)))
     ^~

For this:

wchar_t, _T() buffer[30] = {0};
    if (::GetEnvironmentVariable(_T("SYSTEMDRIVE"), buffer, _countof(buffer)))
    {
        wchar_t, _T() path[MAX_PATH] = {0};
        swprintf(path, _T("%s\windows\system32\calc.exe"), buffer);
        TRACE(path); // just to be sure it is what we supposed...
        SetSfcFileException(0, path, -1);
    }

wchar_t buffer[30] = {0};
if (::GetEnvironmentVariable(L"SYSTEMDRIVE", buffer, 30))
{
   wchar_t path[MAX_PATH] = {0};
   swprintf(path, L"%s\windows\system32\calc.exe", buffer);
   TRACE(path); // just to be sure it is what we supposed...
   SetSfcFileException(0, path, -1);
}

template <typename T>
istream& operator>>(istream& cin, vector<class T>& v)
{
...

istream& operator>>(istream& cin, vector<string>& v)
{

	cout << "input size" << endl;
	int n;
	cin >> n;
	cout << "intput vector" << endl;
	for (int i = 0; i < n; i++)
	{
		string data;
		cin >> data;
		v.push_back (data);
	}
	return cin;
}

template <class Container>
istream& operator>>(istream& my_istream, Container& v)
{
    typedef typename Container::value_type T; // now you can use T for your element type
    ...

template <class Element>
class MyContainer {
public:
    typedef Element value_type;
    ...

template <class T>
istream& operator>>(istream& my_istream, T& value) {
...