How to convert a std::string to LPCSTR and LPWSTR?

Converting std::string to LPCSTR and LPWSTR

Converting a std::string to an LPCSTR (a long pointer to constant string) is a relatively straightforward process. You can do this by calling the c_str() method on the std::string object, which returns a const char * value that you can then assign to an LPCSTR.

However, things become a little more complicated when converting a std::string to an LPWSTR, which is a long pointer to a Unicode (wide) string. To do this, you will need to use the _bstr_t class, which is a template class that can be used to convert between different types of strings.

Here is an example of how you can convert a std::string to an LPWSTR using the _bstr_t class:

#include <string>
#include <comdef.h>

int main() {
  std::string str = "Hello world";
  _bstr_t bstr(str.c_str());

  // Now you have an LPWSTR that you can use.
  LPWSTR wide_str = bstr.GetBSTR();

  return 0;
}

Understanding LPSTR, LPCSTR, LPWSTR, and LPCWSTR

The names of these different string types can be confusing, but if you break them down, they become much easier to understand.

• LPSTR - (long) pointer to string - char *
• LPCSTR - (long) pointer to constant string - const char *
• LPWSTR - (long) pointer to Unicode (wide) string - wchar_t *
• LPCWSTR - (long) pointer to constant Unicode (wide) string - const wchar_t *

As you can see, the only difference between these types is whether they are pointers to constant strings or not. You can ignore the L (long) part of the names -- it's a holdover from 16-bit Windows.

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