MSDN's bug(2): DlgDirListComboBox

最新推荐文章于 2025-02-12 15:51:05 发布

原创最新推荐文章于 2025-02-12 15:51:05 发布 · 1.4k 阅读

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博客介绍了DlgDirListComboBox函数，指出示例代码会导致崩溃，原因是该函数会修改传入的字符串，此字符串需足够长。还给出了正确用法，使用TCHAR数组存储路径并传入函数。

int DlgDirListComboBox( LPTSTR lpPathSpec, int nIDComboBox, int nIDStaticPath, UINT nFileType );

Example

// If pDialog points to a CDialog object with a combo box
// with the identifier IDC_DIRBOX, this call will populate
// the box with only the non-hidden subdirectories in the root
// directory of the C:/ drive.

pDialog->DlgDirListComboBox(_T("C://"), IDC_DIRBOX, 0,
   DDL_EXCLUSIVE | DDL_DIRECTORY);

would cause crash, becase

lpPathSpec

Points to a null-terminated string that contains the path or filename. DlgDirListComboBox modifies this string, which should be long enough to contain the modifications.

Correct Usage

TCHAR szPath [MAX_PATH] = _T("C://") ;

pDialog->DlgDirListComboBox(szPath, IDC_DIRBOX, 0,
DDL_EXCLUSIVE | DDL_DIRECTORY);