mplayer の一部である mencoder.exe を呼び出していくつかのファイルを flv 形式に変換する vb6 アプリがあります。この1つのopendivxファイルを変換しようとするたびに、mencoderからこの奇妙な未処理の例外の問題が発生します。
現時点では、このコーデックが原因であるかどうかは不明です。いずれにせよ、コマンドラインを変更しようとし、mencoder の最新バージョンをダウンロードしました。
そのため、変換は正常に機能し、唯一の問題は、ビデオ ファイルが何らかの形で 100% から 102% を超えるため、mencoder が最終的にクラッシュすることです。したがって、私の質問は、醜いエラーポップアップが表示されないように、この例外をvb6アプリで処理するようにルーティングするにはどうすればよいですか?
コードに例外キャプチャも含めましたが、その例外をキャッチしていません。
' Function GetCommandOutput
'
' sCommandLine: [in] Command line to launch
' blnStdOut [in,opt] True (defualt) to capture output to STDOUT
' blnStdErr [in,opt] True to capture output to STDERR. False is default.
' blnOEMConvert: [in,opt] True (default) to convert DOS characters to Windows, False to skip conversion
'
' Returns: String with STDOUT and/or STDERR output
'
Public Function GetCommandOutput(sCommandLine As String, _
Optional blnStdOut As Boolean = True, _
Optional blnStdErr As Boolean = False, _
Optional blnOEMConvert As Boolean = True, _
Optional encoderType As String) As String
Dim hPipeRead As Long, hPipeWrite1 As Long, hPipeWrite2 As Long
Dim hCurProcess As Long
Dim sa As SECURITY_ATTRIBUTES
Dim si As STARTUPINFO
Dim pi As PROCESS_INFORMATION
Dim baOutput() As Byte
Dim sNewOutPut As String
Dim lBytesRead As Long
Dim fTwoHandles As Boolean
Dim lRet As Long
Const BUFSIZE = 1024 ' pipe buffer size
On Error GoTo ErrorHandler
' At least one of them should be True, otherwise there's no point in calling the function
If (Not blnStdOut) And (Not blnStdErr) Then
Err.Raise 5 ' Invalid Procedure call or Argument
End If
' If both are true, we need two write handles. If not, one is enough.
fTwoHandles = blnStdOut And blnStdErr
ReDim baOutput(BUFSIZE - 1) As Byte
With sa
.nLength = Len(sa)
.bInheritHandle = 1 ' get inheritable pipe handles
End With
If CreatePipe(hPipeRead, hPipeWrite1, sa, BUFSIZE) = 0 Then
Exit Function
End If
hCurProcess = GetCurrentProcess()
' Replace our inheritable read handle with an non-inheritable. Not that it
' seems to be necessary in this case, but the docs say we should.
Call DuplicateHandle(hCurProcess, hPipeRead, hCurProcess, hPipeRead, 0&, 0&, DUPLICATE_SAME_ACCESS Or DUPLICATE_CLOSE_SOURCE)
' If both STDOUT and STDERR should be redirected, get an extra handle.
If fTwoHandles Then
Call DuplicateHandle(hCurProcess, hPipeWrite1, hCurProcess, hPipeWrite2, 0&, 1&, DUPLICATE_SAME_ACCESS)
End If
With si
.cb = Len(si)
.dwFlags = STARTF_USESHOWWINDOW Or STARTF_USESTDHANDLES
.wShowWindow = SW_HIDE ' hide the window
If fTwoHandles Then
.hStdOutput = hPipeWrite1
.hStdError = hPipeWrite2
ElseIf blnStdOut Then
.hStdOutput = hPipeWrite1
Else
.hStdError = hPipeWrite1
End If
End With
Dim totalSeconds As Double
If CreateProcess(vbNullString, sCommandLine, ByVal 0&, ByVal 0&, 1, 0&, ByVal 0&, vbNullString, si, pi) Then
' Close thread handle - we don't need it
Call CloseHandle(pi.hThread)
' Also close our handle(s) to the write end of the pipe. This is important, since
' ReadFile will *not* return until all write handles are closed or the buffer is full.
Call CloseHandle(hPipeWrite1)
hPipeWrite1 = 0
If hPipeWrite2 Then
Call CloseHandle(hPipeWrite2)
hPipeWrite2 = 0
End If
Do
' Add a DoEvents to allow more data to be written to the buffer for each call.
' This results in fewer, larger chunks to be read.
'DoEvents
If ReadFile(hPipeRead, baOutput(0), BUFSIZE, lBytesRead, ByVal 0&) = 0 Then
Exit Do
End If
If blnOEMConvert Then
' convert from "DOS" to "Windows" characters
sNewOutPut = String$(lBytesRead, 0)
Call OemToCharBuff(baOutput(0), sNewOutPut, lBytesRead)
Else
' perform no conversion (except to Unicode)
sNewOutPut = Left$(StrConv(baOutput(), vbUnicode), lBytesRead)
End If
GetCommandOutput = GetCommandOutput & sNewOutPut
' If you are executing an application that outputs data during a long time,
' and don't want to lock up your application, it might be a better idea to
' wrap this code in a class module in an ActiveX EXE and execute it asynchronously.
' Then you can raise an event here each time more data is available.
'Debug.Print sNewOutPut + vbNewLine
If encoderType = "ffmpeg" Then
If totalSeconds < 1 Then
totalSeconds = GetFFmpegFileTotalSeconds(sNewOutPut)
End If
Call CalculateFFMpegProgress(sNewOutPut, totalSeconds)
Else
Call CalculateMencoderProgress(sNewOutPut)
End If
'RaiseEvent OutputAvailable(sNewOutput)
Loop
' When the process terminates successfully, Err.LastDllError will be
' ERROR_BROKEN_PIPE (109). Other values indicates an error.
Call CloseHandle(pi.hProcess)
Else
GetCommandOutput = "Failed to create process, check the path of the command line."
End If
' clean up
Call CloseHandle(hPipeRead)
If hPipeWrite1 Then
Call CloseHandle(hPipeWrite1)
End If
If hPipeWrite2 Then
Call CloseHandle(hPipeWrite2)
End If
Exit Function
ErrorHandler:
Call WriteErrorLog(Err, "Class clsThread : Sub GetCommandOutput")
End Function
アップデート:
アプリケーションがクラッシュしたときに何を出力していたのか興味がある場合は、次のようにします。
1 つの重複フレーム!
Pos: 83.2s 2504f (99%) 112.65fps Trem: 0min 6mb AV:0.008 [571:79]] 1 つの重複フレーム!
Pos: 83.4s 2510f (102%) 112.74fps Trem: 0min 6mb AV:0.006 [571:79] 1 つの重複フレーム!
Pos: 83.6s 2516f (102%) 112.84fps Trem: 0min 6mb AV:0.004 [571:79] 1 つの重複フレーム!
[mpeg4 @ 0x1ac53a0]40 DC、40 AC、40 MV エラーを隠す AV:0.003 [571:79]
代替テキスト http://img21.imageshack.us/img21/4539/exception.png
ありがとう ：）