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What is a Bstr?

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What is a Bstr?

A BSTR (Basic string or binary string) is a string data type that is used by COM, Automation, and Interop functions. Use the BSTR data type in all interfaces that will be accessed from script.

Can Bstr be null?

Yes – a NULL BSTR is the same as an empty one.

What is a TCHAR c++?

For Unicode character set: TCHAR stands for wchar (Wide character of 2 byte) For example : If your Visual Studio project setting have character set = Multi byte character set.

How do you convert Bstr to CString?

You can just assign the string this way: csError = bstrErr. GetBSTR(); Or use the constructor CString csError( bstrErr.

What is difference between Tchar and char?

TCHAR is simply a macro that expands to char in ANSI builds (i.e. _UNICODE is not defined) and wchar_t in Unicode builds ( _UNICODE is defined). There are various string types based on the TCHAR macro, such as LPCTSTR (long pointer to a constant TCHAR string).

What is Lpcwstr?

An LPCWSTR is a 32-bit pointer to a constant string of 16-bit Unicode characters, which MAY be null-terminated.

How do you declare Lpwstr?

“c++ string to lpwstr” Code Answer

  1. int main.
  2. {
  3. std::string stringtoconvert;
  4. ​
  5. std::wstring temp = std::wstring(stringtoconvert. begin(), stringtoconvert. end());
  6. LPCWSTR lpcwstr = temp. c_str();
  7. }

What is a Lpcstring?

An LPCSTR is a 32-bit pointer to a constant null-terminated string of 8-bit Windows (ANSI) characters.

How do you convert Lpwstr to string?

“How to convert LPWSTR to string” Code Answer’s

  1. int main.
  2. {
  3. std::string stringtoconvert;
  4. ​
  5. std::wstring temp = std::wstring(stringtoconvert. begin(), stringtoconvert. end());
  6. LPCWSTR lpcwstr = temp. c_str();
  7. }

What is the difference between Wparam and Lparam?

In the days of 16-bit Windows, a WPARAM was a 16-bit word, while LPARAM was a 32-bit long. These distinctions went away in Win32; they both became 32-bit values. According to this, LPARAM is defined as LONG_PTR , which in 64-bit Windows is a signed, 64-bit value.

What is the role of the parameters Wparam and Lparam?

Each message could carry with it two pieces of data, called WPARAM and LPARAM . The first one was a 16-bit value (“word”), so it was called W. The second one was a 32-bit value (“long”), so it was called L. You used the W parameter to pass things like handles and integers.

What is Winapi used for?

The Windows API (application programming interface) allows user-written programs to interact with Windows, for example to display things on screen and get input from mouse and keyboard. All Windows programs except console programs must interact with the Windows API regardless of the language.

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