双空终止字符串

发布于 2024-10-10 17:43:30 字数 827 浏览 2 评论 0原文

我需要将字符串格式化为双空终止字符串才能使用 SHFileOperation。

有趣的是，我发现以下其中一项有效，但不是两者都有效：

  // 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);

有人对此有想法吗？

还有其他方法附加双终止字符串吗？

原文

I need to format a string to be double null-terminated string in order to use SHFileOperation.

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);

Does anyone has idea on this?

Is there other way to append double-terminated string?

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烟火散人牵绊 2024-10-17 17:43:30

CString 类本身对于包含空字符的字符串没有问题。问题在于首先将空字符放入字符串中。第一个示例之所以有效，是因为它附加了单个字符，而不是字符串 - 它按原样接受该字符，而不检查它是否为空。第二个示例尝试附加一个典型的 C 字符串，根据定义，该字符串以第一个空字符结束 - 您实际上是附加一个空字符串。

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香草可樂 2024-10-17 17:43:30

您不能使用 CString 来实现此目的。您将需要使用自己的 char[] 缓冲区：

char buf[100]; // or large enough
strcpy(buf, "string to use");
memcpy(buf + strlen(buf), "\0\0", 2);

虽然您可以通过在现有 NUL 终止符后再复制一个 NUL 字节来实现这一点，但我更愿意复制两个，以便源代码更准确反映了程序员的意图。

You cannot use CString for this purpose. You will need to use your own char[] buffer:

char buf[100]; // or large enough
strcpy(buf, "string to use");
memcpy(buf + strlen(buf), "\0\0", 2);

Although you could do this by only copying one more NUL byte after the existing NUL terminator, I would prefer to copy two so that the source code more accurately reflects the intent of the programmer.

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