我有6-10个数据框对象，我想写出来。现在我必须用var videoSettings = new NSMutableDictionary();
videoSettings.Add(AVVideo.CodecKey, AVVideo.CodecH264);
videoSettings.Add(AVVideo.WidthKey, NSNumber.FromNFloat(images[0].Size.Width));
videoSettings.Add(AVVideo.HeightKey, NSNumber.FromNFloat(images[0].Size.Height));
var videoWriter = new AVAssetWriter(fileURL, AVFileType.Mpeg4, out nsError);
var writerInput = new AVAssetWriterInput(AVMediaType.Video, new AVVideoSettingsCompressed(videoSettings));
var sourcePixelBufferAttributes = new NSMutableDictionary();
sourcePixelBufferAttributes.Add(CVPixelBuffer.PixelFormatTypeKey, NSNumber.FromInt32((int)CVPixelFormatType.CV32ARGB));
var pixelBufferAdaptor = new AVAssetWriterInputPixelBufferAdaptor(writerInput, sourcePixelBufferAttributes);
videoWriter.AddInput(writerInput);
if (videoWriter.StartWriting())
{
videoWriter.StartSessionAtSourceTime(CMTime.Zero);
for (int i = 0; i < images.Length; i++)
{
while (true)
{
if (writerInput.ReadyForMoreMediaData)
{
var frameTime = new CMTime(1, 10);
var lastTime = new CMTime(1 * i, 10);
var presentTime = CMTime.Add(lastTime, frameTime);
var pixelBufferImage = PixelBufferFromCGImage(images[i].CGImage, pixelBufferAdaptor);
Console.WriteLine(pixelBufferAdaptor.AppendPixelBufferWithPresentationTime(pixelBufferImage, presentTime));
break;
}
}
}
writerInput.MarkAsFinished();
await videoWriter.FinishWritingAsync();
手动写出每一个。我想简化我的代码并遍历对象并将它们全部写出来。
我在这里尝试过这些建议：
Write to files in R using a loop
writing many files in a for loop using R
但是，我一直在获取正确命名的文件，但看起来像这样：
write.table以下是我的代码示例：
> "x"
"1" "listdata_cent"
非常感谢您提供的任何帮助。我确定我错过了一些简单的东西。
答案 0 :(得分：0)
感谢Nick Criswell，Richard Telford和Gregor。我找到了解决方案。
datalist = lapply(ls(pattern = "^listdata"), get)
names(datalist) <- (ls(pattern = "^listdata"))
for (i in 1:length(datalist)) {
write.table(datalist[i], file = paste(names(datalist[i]), ".txt", sep = ""), col.names= TRUE, sep = "\t", quote=FALSE)
}
看起来这可能与此问题有关。 - Nick Criswell 4小时前 1
我就是这个名字。得到（i）会找到对象我 - 理查德特尔福德4小时前 1
而不是让一堆数据帧浮动，最佳做法是拥有一个数据帧列表。如果您的数据框位于列表中，则问题变得微不足道。 - Gregor 4小时前