CString很简单的关于GetBuffer ReleaseBuffer_throwcstringexception-优快云博客

本文链接：https://blog.youkuaiyun.com/zhaozh2000/article/details/37660129

本文详细介绍了CString类的GetBuffer成员函数。此函数返回指向CString内部字符缓冲区的指针，允许直接修改字符串内容。使用该指针更改字符串内容后，必须调用ReleaseBuffer。文章还解释了GetBuffer返回地址的有效性及释放内存的自动处理。

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CString::GetBuffer

LPTSTR GetBuffer( int nMinBufLength );
throw( CMemoryException );

Return Value

An LPTSTR pointer to the object’s (null-terminated) character buffer.

Parameters

nMinBufLength

The minimum size of the character buffer in characters. This value does not include space for a null terminator.

Remarks

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

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 and ReleaseBuffer will perform a strlen on the buffer to determine its length.