如何调试PowerShell的异常调用“InvokeMember”和“5”的说法（S）：类型不匹配

Question

我试图实现从脚本专家此代码示例：http://blogs.technet.com/b/heyscriptingguy/archive/2010/04/06/hey-scripting-guy-how-can-i-add-custom-properties-to-a-microsoft-word-document.aspx

代码：

$path = "C:\fso\Test.docx" 
$application = New-Object -ComObject word.application 
$application.Visible = $false 
$document = $application.documents.open($path) 
$binding = "System.Reflection.BindingFlags" -as [type] 

$customProperties = $document.CustomDocumentProperties 
$typeCustomProperties = $customProperties.GetType() 

$CustomProperty = "Client" 
$Value = "My_WayCool_Client" 
[array]$arrayArgs = $CustomProperty,$false, 4, $Value 

Try 
{ 
    $typeCustomProperties.InvokeMember(` 
    "add", $binding::InvokeMethod,$null,$customProperties,$arrayArgs) | 
    out-null 
} 
Catch [system.exception] 
{ 
    $propertyObject = $typeCustomProperties.InvokeMember(` 
    "Item", $binding::GetProperty,$null,$customProperties,$CustomProperty) 
    $typeCustomProperties.InvokeMember(` 
    "Delete", $binding::InvokeMethod,$null,$propertyObject,$null) 
    $typeCustomProperties.InvokeMember(` 
    "add", $binding::InvokeMethod,$null,$customProperties,$arrayArgs) | 
    Out-Null 
} 

$document.Saved = $false 
$document.save() 
$application.quit() 
$application = $null 
[gc]::collect() 
[gc]::WaitForPendingFinalizers() 

错误（我删除的try-catch包装，其目的是处理这种情况时要添加的自定义属性已存在的docx文件，它没有）：

Exception calling "InvokeMember" with "5" argument(s): "Type mismatch. (Exception from HRESULT: 0x80020005 (DISP_E_TYPEMISMATCH))" 
At C:\Set-WordCustomProperties.ps1:16 char:3 

所有不同的InvokeMethod行都以类似的错误结束。该错误消息对调试不是很有帮助。有什么方法可以获得有关错误的更多信息吗？

Answer 1

有没有什么办法可以获得更多不正确的信息？

有几件事你可能会尝试获得更详细的信息。首先，在您的catch块中，立即捕获$ error [0]和$ _。这两个通常包含最新的错误信息取决于你在做什么。立即捕获它们将确保它们不被catch块中的某些东西覆盖。

Catch [system.exception] 
{ 
    $err1 = $error[0] 
    $err2 = $_ 
    $propertyObject = $typeCustomProperties.InvokeMember(` 
    "Item", $binding::GetProperty,$null,$customProperties,$CustomProperty) 
    $typeCustomProperties.InvokeMember(` 
    "Delete", $binding::InvokeMethod,$null,$propertyObject,$null) 
    $typeCustomProperties.InvokeMember(` 
    "add", $binding::InvokeMethod,$null,$customProperties,$arrayArgs) | 
    Out-Null 
} 

或者，你可以使用...

$error[0]|format-list –force 

要强制进行更详细的解释。 A Powershell Tips & Tricks post显示了上述命令的输出结果。