［在线等！解决立即给分］简单问题：为什么字符串的长度为0

[leyt]

我从ini文件读取一个字符串，

ini文件内容为：
***********************
[ana]
path=D:\
***********************

CString strpath;
::GetPrivateProfileString("ana","path","d:\\default",
strpath.GetBuffer(MAX_PATH),MAX_PATH,"c:\\WINDOWS\\ana.ini");

发现strpath的长度为0,这是为什么？我错在哪个地方了？

[Kudeet]

MAX_PATH是怎么用的

[Kudeet]

在线????????????????

[王国凡]

请在最后加上一行:
strpath.ReleaseBuffer();

[leyt]

Sorry,出去了一会儿：）

MAX_PATH 用windef.h里的，我没动

[subtop]

最好这么用:
::GetPrivateProfileString("ana","path","d:\\default",
(LPTSTR)(LPCTSTR)strpath,MAX_PATH,"c:\\WINDOWS\\ana.ini");

还有,当调用CString::GetBuffer()后,必须再调用一次CString::ReleaseBuffer(),否则,该CString对象的成员函数不能正常工作.

详情见下:
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.

[leyt]

多谢各位的帮助，with上面的方法，问题已解决！

给分！