关于CString::GetBuffer的用法的疑问

[xenter]

Char buf[32];
CString sBuf="hello";
strcpy(buf,sBuf.GetBuffer(0));
和strcpy(buf,sBuf.GetBuffer(32)); //有什么区别？为什么结果会一样呢？

[Linux2001]

CString的成员函数GetBuffer就是返回当前这个CString类中的字符串头指针啊！

[wuxfBrave]

This method retrieves a pointer to the internal character buffer for the CString object. The returned LPTSTR is not const and thus allows direct modification of CString contents.

If nMinBufLength is greater than the length of the current buffer, the call to GetBuffer will destroy the current buffer. Replace it with a buffer of the requested size, and reset the reference count to zero. If you have previously called LockBuffer on this buffer, you will lose the lock on the buffer.

LPTSTR GetBuffer(
int nMinBufLength );
Parameters

nMinBufLength
Specifies the minimum size of the character buffer in characters. This value does not include space for a null terminator.
Return Value

This is an LPTSTR pointer to the character buffer of the null-terminated object.

Remarks

If you use the pointer returned by GetBuffer to change the string contents, you must call ReleaseBuffer before using any other CString methods.

The address returned by GetBuffer may not be valid after the call to ReleaseBuffer since additional CString operations may cause the CString buffer to be reallocated. The buffer will not be reallocated if you do not change the length of the CString.

The buffer memory will be freed automatically when the CString object is destroyed.

Note that, if you keep track of the string length yourself, you should not append the terminating null character. You must, however, specify the final string length when you release the buffer with ReleaseBuffer. If you do append a terminating null character, you should pass –1 for the length to ReleaseBuffer, which will perform a _tcslen on the buffer to determine its length.

[xiaohyy]

我都是用的GetBuffer(0)