CFileException::GetErrorMessage
检索介绍异常的文本。
virtual BOOL GetErrorMessage(
LPTSTR lpszError,
UINT nMaxError,
PUINT pnHelpContext = NULL
) const;
参数
[in,out] lpszError
对收到错误消息的缓冲区的指针。[in] nMaxError
指定缓冲区可以容纳的最大字符数。这包括终止null字符)。[in,out] pnHelpContext
用于接收帮助上下文ID.的无符号整数的指针如果 NULL,没有ID返回。
返回值
TRUE,如果方法成功;否则 FALSE。
备注
如果指定的缓冲区太小,错误消息被截断。
示例
下面的示例使用 CFileException::GetErrorMessage。
CFile fileInput;
CFileException ex;
// try to open a file for reading.
// The file will certainly not
// exist because there are too many explicit
// directories in the name.
// if the call to Open() fails, ex will be
// initialized with exception
// information. the call to ex.GetErrorMessage()
// will retrieve an appropriate message describing
// the error, and we'll add our own text
// to make sure the user is perfectly sure what
// went wrong.
if (!fileInput.Open(_T("\\Too\\Many\\Bad\\Dirs.DAT"), CFile::modeRead, &ex))
{
TCHAR szCause[255];
CString strFormatted;
ex.GetErrorMessage(szCause, 255);
// (in real life, it's probably more
// appropriate to read this from
// a string resource so it would be easy to
// localize)
strFormatted = _T("The data file could not be opened because of this error: ");
strFormatted += szCause;
AfxMessageBox(strFormatted);
}
else
{
// the file was opened, so do whatever work
// with fileInput
// we were planning...
fileInput.Close();
}
要求
标头: afx.h