winapi - 哪些原因会导致 ShellExecute 失败？

Question

我有一个 VB6 应用程序，它使用以下方法打开文件及其关联的应用程序:

ShellExecute(0, "open", filename, params, vbNullString, vbNormalFocus)

这完美地工作。

现在我有一个客户(使用 Adob​​e Reader 运行 XP)无法使用上述命令打开任何 PDF 文件。但是当从 Windows 资源管理器中双击它时，可以毫无问题地打开同一个文件。我还在我的机器上测试了文件名/路径组合以排除这些问题。

我正在寻找有关我可以检查的任何提示以确保 ShellExecute正在工作。或者什么会导致 ShellExecute 以这种方式失败？

Answer 1

进一步到托马斯的 answer ，这里有一些 VB6 常量，用于 ShellExecute 的可能返回值，以及可能的解释(我想我最初是从 MSDN page 的返回值部分中获取的)。返回值等于或小于 32 表示调用失败。返回的特定值指示出了什么问题。

Const ERROR_BAD_FORMAT = 11&
Const ERROR_FILE_NOT_FOUND = 2&          
Const ERROR_PATH_NOT_FOUND = 3&          ' The specified path was not found. '
Const SE_ERR_ACCESSDENIED = 5            ' The operating system denied access to the specified file. '
Const SE_ERR_ASSOCINCOMPLETE = 27        ' The file name association is incomplete or invalid. '
Const SE_ERR_DDEBUSY = 30                ' The Dynamic Data Exchange (DDE) transaction could not be completed because other DDE transactions were being processed. '
Const SE_ERR_DDEFAIL = 29                ' The DDE transaction failed. '
Const SE_ERR_DDETIMEOUT = 28             ' The DDE transaction could not be completed because the request timed out. '
Const SE_ERR_DLLNOTFOUND = 32            ' The specified dynamic-link library (DLL) was not found. '
Const SE_ERR_FNF = 2                     ' The specified file was not found. '
Const SE_ERR_NOASSOC = 31                ' There is no application associated with the given file name extension. '
Const SE_ERR_OOM = 8                     '  out of memory '
Const SE_ERR_PNF = 3                     '  path not found '
Const SE_ERR_SHARE = 26                  ' A sharing violation occurred. '