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Distinguishing LPCSTR, LPCTSTR, and LPTSTR

What are the key differences between LPCSTR, LPCTSTR, and LPTSTR?

Unraveling the Acronyms

To understand these terms, let's break down their acronyms:

• LPCSTR: Long Pointer to a Constant STRing
• LPCTSTR: Long Pointer to a Constant TCHAR STRing
• LPTSTR: Long Pointer to a TCHAR STRing

The terms "Long Pointer" (LP) refer to the fact that these are all 64-bit pointers, as opposed to 32-bit pointers.

TCHAR: The Pivotal Character

The main difference between these terms lies in the character type they refer to:

• STR: ASCII characters (8-bit)
• TCHAR: Represents characters based on the UNICODE setting of the project. If UNICODE is defined, TCHAR represents wide characters (16-bit); otherwise, it represents ASCII characters.

Constant vs. Non-Constant

LPCSTR and LPCTSTR both refer to constant strings, meaning their content cannot be modified. On the other hand, LPTSTR refers to a non-constant TCHAR string, allowing for content modifications.

Conversion Example

The code snippet you provided demonstrates the conversion of a string into a LV / _ITEM structure variable pszText. It involves casting a pointer to a const string (LPCTSTR) to a pointer to a non-const TCHAR string (LPTSTR). This conversion is necessary because the pszText field in the LV_DISPINFO structure requires a TCHAR string.

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