如何在批处理文件运行之前等待复制完成？

Question

我正在尝试创建一个批处理文件，该文件将调整放置在文件夹中的图像的大小，并让一个批处理文件“监视”文件夹的更改。我目前有这个：

@echo off
set "source_folder=c:\src"
set "result_folder_1=c:\res1"

:start
if exist %source_folder%\*.jpg (
    for %%a in ("%source_folder%\*jpg") do (
        call scale.bat -source "%%~fa" -target "%result_folder_1%\%%~nxa" -max-height 1000 -max-width 1000 -keep-ratio yes -force yes
        del "%%~fa"
    )
)
goto start

而scale.bat是：

@if (@X)==(@Y) @end /* JScript comment 
        @echo off        
        cscript //E:JScript //nologo "%~f0" %* 
        ::pause
        exit /b %errorlevel%       
@if (@X)==(@Y) @end JScript comment */ 

//https://msdn.microsoft.com/en-us/library/windows/desktop/ms630819(v=vs.85).aspx

var imageFile = new ActiveXObject("WIA.ImageFile"); 
var imageProcess = new ActiveXObject("WIA.ImageProcess");
var fileSystem = new ActiveXObject("Scripting.FileSystemObject");
var ARGS=WScript.Arguments;

/******
Scale filter description:

Scales image to the specified Maximum Width and Maximum Height preserving
Aspect Ratio if necessary.


MaximumWidth        - Set the MaximumWidth property to the width (in pixels)
                      that you wish to scale the image to.
MaximumHeight       - Set the MaximumHeight property to the height (in pixels)
                      that you wish to scale the image to.
PreserveAspectRatio - Set the PreserveAspectRatio property to True
                      [the default] if you wish to maintain the current aspect
                      ration of the image, otherwise False and the image will
                      be stretched to the MaximumWidth and MaximumHeight
FrameIndex          - Set the FrameIndex property to the index of a frame if
                      you wish to modify a frame other than the ActiveFrame,
                      otherwise 0 [the default]
                      

******/

//defaults

var maxWidth=0;
var maxHeight=0;

var pRatio=true;
var frameIndex=0;

var source="";
var target="";

var force=false;

var height=0;
var width=0;

var percentage=false;

////////////////////////////
////                      //
/**/     var QUALITY=100; //
////                      //
////////////////////////////

function existsFile(path){
    if (fileSystem.FileExists(path))
        return true;
}

function existsFolder(path){
    if (fileSystem.FolderExists(path))
        return true;
}

function deleteFile(path){
    fileSystem.DeleteFile(path);
}

function loadImage(image,imageFile){
    try{
       image.LoadFile(imageFile);
    }catch(err){
       WScript.Echo("Probably "+imageFile+" is not a valid image file");
       WScript.Echo(err.message);
       WScript.Quit(30);
    }
    height=image.Height;
    width=image.Width;
}

function ID2Format(id){
    var ids={};
    ids["{B96B3CAB-0728-11D3-9D7B-0000F81EF32E}"]="BPM";
    ids["{B96B3CAF-0728-11D3-9D7B-0000F81EF32E}"]="PNG";
    ids["{B96B3CB0-0728-11D3-9D7B-0000F81EF32E}"]="GIF";
    ids["{B96B3CAE-0728-11D3-9D7B-0000F81EF32E}"]="JPG";
    ids["{B96B3CB1-0728-11D3-9D7B-0000F81EF32E}"]="TIFF";
    
    return ids[id];
}

function format2ID(format){
    formats={};
    formats["BMP"]="{B96B3CAB-0728-11D3-9D7B-0000F81EF32E}";
    formats["PNG"]="{B96B3CAF-0728-11D3-9D7B-0000F81EF32E}";
    formats["GIF"]="{B96B3CB0-0728-11D3-9D7B-0000F81EF32E}";
    formats["JPG"]="{B96B3CAE-0728-11D3-9D7B-0000F81EF32E}";
    formats["TIFF"]="{B96B3CB1-0728-11D3-9D7B-0000F81EF32E}";
    
    return formats[format];
}

function convert(image,format){
    var ic=imageProcess.Filters.Count;
    var filterFormat=format2ID(format);
    if(filterFormat==null){
        WScript.Echo("not supported target format "+format);
        WScript.Quit(90);
    }
    imageProcess.Filters.Add(imageProcess.FilterInfos("Convert").FilterID);
    imageProcess.Filters(ic+1).Properties("FormatID").Value = filterFormat;
    imageProcess.Filters(ic+1).Properties("Quality").Value = QUALITY;
}

function scale(){
    if(maxHeight<=0){
        WScript.Echo("MaximumHeight ("+maxHeight+") should be bigger than 0");
        WScript.Quit(80);
    }
    
    if(maxWidth<=0){
        WScript.Echo("MaximumHeight ("+maxWidth+") should be bigger than 0");
        WScript.Quit(81);
    }
    
    var ic=imageProcess.Filters.Count;
    //var filterFormat=format2ID(format);
    imageProcess.Filters.Add(imageProcess.FilterInfos("Scale").FilterID);
    
    imageProcess.Filters(ic+1).Properties("MaximumWidth").Value = maxWidth;
    imageProcess.Filters(ic+1).Properties("MaximumHeight").Value = maxHeight;
    //WScript.Echo(pRatio+"::"+maxWidth+"::"+maxHeight+">>"+width+"++"+height);
    imageProcess.Filters(ic+1).Properties("PreserveAspectRatio").Value = pRatio;
    imageProcess.Filters(ic+1).Properties("FrameIndex").Value = frameIndex;
}

function fromPerc(){
    maxWidth=Math.round((width*maxWidth)/100);
    maxHeight=Math.round((height*maxHeight)/100);
    if(maxHeight==0)
        maxHeight=1;
    if(maxWidth==0)
        maxWidth=1;
}


function printHelp(){

    WScript.Echo( WScript.ScriptName + " - resizes an image");
    WScript.Echo(" ");
    WScript.Echo(WScript.ScriptName + "-source source.file -target file.format [-max-height height] [-max-width width] [-percentage yes|no] [-keep-ratio yes|no] [-frame-index -0.5..1] ");
    WScript.Echo("-source  - the image that will flipped or rotated.");
    WScript.Echo("-target  - the file where the transformations will be saved in.If the file extension format is different than the source it will be converted to the pointed one.Supported formats are BMp,JPG,GIF,TIFF,PNG");
    WScript.Echo("-percentage  - whether the rescale will be calculated in pixels or in percentages.If yes percentages will be used.Default is no.");
    WScript.Echo("-force  - If yes and the target file already exists , it will be overwritten");
    WScript.Echo("-max-height - max height of the image");
    WScript.Echo("-max-width - max width of the image");
    WScript.Echo("-keep-ratio - if dimensions ratio will be preserved.Default is yes");
    WScript.Echo("-frame-index - Have no idea what this is used for , but it is pressented in the rotation filter capabilities.Images with this and without looks the same.Accepted values are from -0.5 to 1");
    
}

function parseArguments(){
    if (WScript.Arguments.Length<4 || ARGS.Item(1).toLowerCase() == "-help" ||  ARGS.Item(1).toLowerCase() == "-h" ) {
        printHelp();
        WScript.Quit(0);
   }
   
    if (WScript.Arguments.Length % 2 == 1 ) {
        WScript.Echo("Illegal arguments ");
        printHelp();
        WScript.Quit(1);
    }
    
    //ARGS
    for(var arg = 0 ; arg<ARGS.Length-1;arg=arg+2) {
        if (ARGS.Item(arg) == "-source") {
            source = ARGS.Item(arg +1);
        }
        if (ARGS.Item(arg) == "-target") {
            target = ARGS.Item(arg +1);
        }

        if (ARGS.Item(arg).toLowerCase() == "-force" && (ARGS.Item(arg +1).toLowerCase() == "yes" || ARGS.Item(arg +1).toLowerCase() == "true") ) {
            force=true;
        }
        
        if (ARGS.Item(arg).toLowerCase() == "-percentage" && (ARGS.Item(arg +1).toLowerCase() == "yes" || ARGS.Item(arg +1).toLowerCase() == "true") ) {
            percentage=true;
        }
        
        if (ARGS.Item(arg).toLowerCase() == "-keep-ratio" && (ARGS.Item(arg +1).toLowerCase() == "no" || ARGS.Item(arg +1).toLowerCase() == "false") ) {
            pRatio=false;
        }
        
        if (ARGS.Item(arg).toLowerCase() == "-max-width") {
            try {
                maxWidth=parseInt(ARGS.Item(arg +1));               
            } catch (err){
                WScript.Echo("Wrong argument:");
                WScript.Echo(err.message);
                WScript.Quit(10);
            }
            
        }
        
        if (ARGS.Item(arg).toLowerCase() == "-max-height") {
            try {
                maxHeight=parseInt(ARGS.Item(arg +1));              
            } catch (err){
                WScript.Echo("Wrong argument:");
                WScript.Echo(err.message);
                WScript.Quit(15);
            }
            
        }
        
        
        if (ARGS.Item(arg).toLowerCase() == "-frame-index") {
            try {
                frameIndex=parseFloat(ARGS.Item(arg +1));
                if(frameIndex<-0.5 || frameIndex > 1){
                    WScript.Echo("Wrong argument - frame index should be between -0.5 and 1");
                    WScript.Quit(25);
                }
                
            } catch (err){
                WScript.Echo("Wrong argument:");
                WScript.Echo(err.message);
                WScript.Quit(20);
            }           
        }       
    }
    
    if (target==""){
        WScript.Echo("Target file not passed");
        WScript.Quit(5);
    }
    
    if(source==""){
        WScript.Echo("Source file not passed");
        WScript.Quit(6);
    }
}

parseArguments();

if(!existsFile(source)){
    WScript.Echo("Source image: " + source +" does not exists");
    WScript.Quit(40);
}

if(existsFile(target) && !force){
    WScript.Echo("Target image: " + target +" already exists");
    WScript.Quit(45);
}

if(existsFolder(target)){
    WScript.Echo("There's existing folder with the target file  (" + target +") name");
    WScript.Quit(46);
}

if(existsFile(target) && force){
    deleteFile(target);
}

var targetFormat=target.split(".")[target.split(".").length-1].toUpperCase();
loadImage(imageFile,source);
var sourceFormat=ID2Format(imageFile.FormatID);


if(maxWidth==0 && !percentage){
    maxWidth=width;
}

if(maxHeight==0 && !percentage){
    maxHeight=height;
}

if(maxWidth==0 && percentage){
    maxWidth=100;
}

if(maxHeight==0 && percentage){
    maxHeight=100;
}


if(percentage){
    fromPerc();
}



///
scale();
///

if (sourceFormat !== targetFormat ){
    convert(resImg,targetFormat);
}

var resImg=imageProcess.Apply(imageFile);
resImg.SaveFile(target);

它可以工作，但是如果我将多个文件复制到源文件夹中，它可能会在复制尚未完成时启动缩放过程，并导致出现类似“文件已被另一个进程使用”的消息，并跳过此行，而是去删除文件...
那不是我想要的。

如何确保调用 scale.bat 仅发生在已复制并准备缩放的文件上？

Answer 1

所以您的根本问题是连续轮询部分寻找 .jpg 但在构建 .jpeg 期间过早触发

答案很简单，避免先将文件复制到监控文件夹中，如filename.tmp

然后在完成时理想地在输入过程中适当应用延迟

copy output to folder\filename.tmp
ren filename.tmp filename.jpg

在您的文件监视器“监视”循环中

timeout 1
call scale.bat

另一种方法是在“监视”循环中设置更长的超时时间，这样可以应对最坏的情况，但会减慢循环速度。

一个解决方案是使用 2 个循环，这样传入的文件在一个慢得多的并行循环中用 filename_got.jpg 重命名，同时“watch”查找 *_got.jpg

稍后编辑

可能最简单的是在循环中开始“观看”尝试 ren。

如果文件还没有准备好，它应该不会在此过程中重命名，但一旦准备好就可以重命名。

然后只用重命名的文件调用 scale。

@echo off
set "source_folder=c:\src"
set "result_folder_1=c:\res1"

:start
if exist %source_folder%\*.jpg (
    for %%a in ("%source_folder%\*jpg") do (
        ren "%%~na" "%%~na_got.jpg"
        call scale.bat -source "%%~na_got.jpg" -target "%result_folder_1%\%%~nxa" -max-height 1000 -max-width 1000 -keep-ratio yes -force yes
        del "%%~na_got.jpg"
    )
)
goto start

为了避免文件不存在的愚蠢警告，然后包含

if exist "%%~na_got.jpg" call ...`
if exist "%%~na_got.jpg" del ...

如何在批处理文件运行之前等待复制完成？

How can I wait for copy to finish before batch file runs?

javascript

windows

cmd

batch-file