我正在尝试通过运行从视频文件中提取元ffprobe
数据nativeProcess
。下面的代码就像一个文件一样工作,但在尝试循环一系列文件时会导致错误。
我知道问题的原因是 Air 试图nativeProcess
在旧的完成之前开始一个新的。我知道这与听音乐有关air.NativeProcessExitEvent.EXIT
。我只是无法让它工作。任何建议将不胜感激。
function fileOpen(){
var directory = air.File.userDirectory;
try
{
directory.browseForDirectory("Select Directory");
directory.addEventListener(air.Event.SELECT, directorySelected);
}
catch (error)
{
air.trace("Failed:", error.message)
}
function directorySelected(event)
{
directory = event.target ;
var files = directory.getDirectoryListing();
for(i=0; i < files.length; i++){
getMetadata(files[0].nativePath)
//wait here for nativeProcess to finish
}
}
}
function getMetadata(filePathIn){
if(air.NativeProcess.isSupported)
{
}
else
{
air.trace("NativeProcess not supported.");
}
fileIn = filePathIn.toString()
var nativeProcessStartupInfo = new air.NativeProcessStartupInfo();
var file = air.File.applicationStorageDirectory.resolvePath("ffprobe");
nativeProcessStartupInfo.executable = file;
args = new air.Vector["<String>"]();
args.push("-sexagesimal","-show_format","-loglevel","quiet","-show_streams","-print_format","json",filePathIn)
nativeProcessStartupInfo.arguments = args;
process = new air.NativeProcess();
process.start(nativeProcessStartupInfo);
process.addEventListener(air.ProgressEvent.STANDARD_OUTPUT_DATA, onOutputData);
process.addEventListener(air.ProgressEvent.STANDARD_ERROR_DATA, onErrorData);
process.addEventListener(air.NativeProcessExitEvent.EXIT, onExit);
process.addEventListener(air.IOErrorEvent.STANDARD_OUTPUT_IO_ERROR, onIOError);
process.addEventListener(air.IOErrorEvent.STANDARD_ERROR_IO_ERROR, onIOError);
}
function onOutputData()
{
var fileMetadataJSON = process.standardOutput.readUTFBytes(process.standardOutput.bytesAvailable);
air.trace(fileMetadataJSON)
}
function onErrorData(event)
{
air.trace("ERROR -", process.standardError.readUTFBytes(process.standardError.bytesAvailable));
}
function onExit(event)
{
air.trace("Process exited with ", event.exitCode);
}
function onIOError(event)
{
air.trace(event.toString());
}