双NULL终止字符串 [英] Double null-terminated string
问题描述
我需要将一个字符串格式化为双NULL结束的字符串,以便使用SHFileOperation。
I need to format a string to be double null-terminated string in order to use SHFileOperation.
有趣的部分是我发现以下工作之一,但不是两者:
Interesting part is i found one of the following working, but not both:
// Example 1
CString szDir(_T("D:\\Test"));
szDir = szDir + _T('\0') + _T('\0');
// Example 2
CString szDir(_T("D:\\Test"));
szDir = szDir + _T("\0\0");
//Delete folder
SHFILEOPSTRUCT fileop;
fileop.hwnd = NULL; // no status display
fileop.wFunc = FO_DELETE; // delete operation
fileop.pFrom = szDir; // source file name as double null terminated string
fileop.pTo = NULL; // no destination needed
fileop.fFlags = FOF_NOCONFIRMATION|FOF_SILENT; // do not prompt the user
fileop.fAnyOperationsAborted = FALSE;
fileop.lpszProgressTitle = NULL;
fileop.hNameMappings = NULL;
int ret = SHFileOperation(&fileop);
有没有人有这个想法?
Does anyone has idea on this?
是否有其他方法追加双端字符串?
Is there other way to append double-terminated string?
推荐答案
CString类本身对于包含空字符的字符串没有问题。问题出在将空字符放在字符串中。第一个示例工作,因为它是附加一个单一的字符,而不是一个字符串 - 它接受字符作为是没有检查,看看它是否为null。第二个示例尝试附加一个典型的C字符串,其定义结束于第一个空字符 - 您实际上附加了一个空字符串。
The CString class itself has no problem with a string containing a null character. The problem comes with putting null characters into the string in the first place. The first example works because it is appending a single character, not a string - it accepts the character as is without checking to see if it's null. The second example tries appending a typical C string, which by definition ends at the first null character - you're effectively appending an empty string.
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