Casting LPCWSTR to WCHAR 1

[lupidus]

It has been a few years since I've worked with C++, so I'm having some difficulty with these casts.

The goal of this code is to pass lpPassword into CreateProcessWithLogonW successfully. The CreateProcessWithLogonW function takes LPCWSTR lpPassword as a parameter. However, I'm dealing with a std::string initially and need to get it to a LPCWSTR.


So far, I have :

std::string input="encrypted_password_text.."
std::string output; // decrypted password

Encryptor * e = NULL;
e = new Encryptor();

e->DecryptString(input, output);
const char* lpPasswordTmp = output.c_str();
const WCHAR * lpPassword = (LPCWSTR) lpPasswordTmp;

printf("%s", lpPassword); // decrypted password

delete e;
e = NULL;

When I printf, the all the password text comes out as it should, but when I pass the value to the Logon function, the logon fails. If I simply pass the Logon function the following then it works:

const WCHAR *lpPassword = L"password";

I think I need some way to tell the compiler that I'm dealing with a long pointer, but not sure how?

Thanks.

 

[PerFnurt]

>I think I need some way to tell the compiler that I'm dealing with a long pointer, but not sure how?

No, you need to realize that char != WCHAR and that there is no string casting in c++.

std::string handles char based strings.
std::wstring handles w_char based strings.

Fortunately, transforming from std::string to std::wstring is easy.

std::string s("Foo");
std::wstring w;
// Transform s => w
std::string::const_iterator it = s.begin();
while(it!=s.end()) w += *it++;
const WCHAR * whatever = w.c_str();

/Per
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