c++中CString:: Find , ReverseFind, Left, Right

In C++, CString is a class provided by MFC (Microsoft Foundation Class) that encapsulates a null-terminated string of characters. It is similar to the standard C string but provides additional functionality and ease of use.

1. Find: This method is used to find the first occurrence of a substring within the CString object. It takes the substring to search as a parameter and returns the zero-based index of the first occurrence if found, or -1 if not found. The method signature is:

int Find(LPCTSTR lpszSub); 

2. ReverseFind: This method is used to find the last occurrence of a substring within the CString object. It takes the substring to search as a parameter and returns the zero-based index of the last occurrence if found, or -1 if not found. The method signature is:

int ReverseFind(LPCTSTR lpszSub); 

3. Left: This method is used to extract a specified number of characters from the left side of the CString object. It takes the number of characters to extract as a parameter and returns a new CString object containing the extracted characters. The original CString object remains unchanged. The method signature is:

CString Left(int nCount) const; 

4. Right: This method is used to extract a specified number of characters from the right side of the CString object. It takes the number of characters to extract as a parameter and returns a new CString object containing the extracted characters. The original CString object remains unchanged. The method signature is:

CString Right(int nCount) const; 

These methods provide useful string manipulation functionality in C++ using the CString class.