如何解压缩包含一个文件的大型zip文件并使用swift以字节为单位获取进度？ [英] How to unzip a big zip file containing one file and get the progress in bytes with swift?
问题描述
我尝试解压缩只包含一个项目（超过100MB）的大型zip文件，并希望在解压缩过程中显示进度。
I try to unzip a big zip file containing only one item (more than 100MB) and like to show the progress during unzipping.
我找到了进度的解决方案可以根据解压缩的文件数量确定，但在我的情况下，我只有一个大文件。所以我想它必须由解压缩的字节数决定？
I found solutions where the progress can be determined based on the amount of files unzipped but in my case I have only one big file inside. So I guess it must be determined by the amount of bytes unzipped?
实际上我使用SSZipArchive并使用以下代码，该代码工作正常：
Actually I am using SSZipArchive with the following code which works fine:
var myZipFile:NSString="/Users/user/Library/Developer/CoreSimulator/Devices/mydevice/ziptest/testzip.zip";
var DestPath:NSString="/Users/user/Library/Developer/CoreSimulator/Devices/mydevice/ziptest/";
let unZipped = SSZipArchive.unzipFileAtPath(myZipFile as! String, toDestination: DestPath as! String);
我找不到解决方案。
有没有人提供样品的提示，样品或链接？
Does anyone have a hint, sample or link to a sample ?
更新：
以下代码看起来像是可以的预期，但只有一个文件被解压缩时，处理程序将只被调用一次（在解压缩结束时）：
UPDATE: Following code looks like it would work as intended, but the handler will be called only once (at the end of unzipping) when the only one file is unzipped:
func unzipFile(sZipFile: String, toDest: String){
SSZipArchive.unzipFileAtPath(sZipFile, toDestination: toDest, progressHandler: {
(entry, zipInfo, readByte, totalByte) -> Void in
println("readByte : \(readByte)") // <- This will be only called once, at the end of unzipping. My 500MB Zipfile holds only one file.
println("totalByte : \(totalByte)")
//Asynchrone task
dispatch_async(dispatch_get_main_queue()) {
println("readByte : \(readByte)")
println("totalByte : \(totalByte)")
//Change progress value
}
}, completionHandler: { (path, success, error) -> Void in
if success {
//SUCCESSFUL!!
} else {
println(error)
}
})
}
更新2：
正如SSArchive中分析的Martin R一样可能。
有没有其他方法来解压缩文件并显示基于进度的kbytes？
As "Martin R" analysed in SSArchive, its not possible. Is there any other way to unzip a file and show the progress based kbytes?
更新3：
在解决方案被roop解释后，我更改了SSZipArchive.m，如下所示。可能其他人也可以使用它：
I changed the SSZipArchive.m after the solution was explained by "roop" as follows. Probably someone else can use this too:
FILE *fp = fopen((const char*)[fullPath UTF8String], "wb");
while (fp) {
int readBytes = unzReadCurrentFile(zip, buffer, 4096);
if (readBytes > 0) {
fwrite(buffer, readBytes, 1, fp );
totalbytesread=totalbytesread+4096;
// Added by me
if (progressHandler)
{
progressHandler(strPath, fileInfo, currentFileNumber, totalbytesread);
}
// End added by me
} else {
break;
}
}
推荐答案
到实现你想要的，你将不得不修改SSZipArchive的内部代码。
To achieve what you want, you will have to modify SSZipArchive's internal code.
SSZipArchive 使用minizip提供压缩功能。你可以在这里看到minizip解压缩API： unzip.h 。
SSZipArchive uses minizip to provide the zipping functionality. You can see the minizip unzipping API here: unzip.h.
在SSZipArchive.m中，您可以从 fileInfo 变量。
In SSZipArchive.m, you can get the uncompressed size of the file being unzipped from the fileInfo variable.
您可以看到正在阅读解压缩的内容这里：
You can see that the unzipped contents are being read here:
FILE *fp = fopen((const char*)[fullPath UTF8String], "wb");
while (fp) {
int readBytes = unzReadCurrentFile(zip, buffer, 4096);
if (readBytes > 0) {
fwrite(buffer, readBytes, 1, fp );
} else {
break;
}
}
您需要 readBytes 和未压缩的文件大小，用于计算单个文件的进度。您可以向SSZipArchive添加新委托，以将这些数据发送回调用代码。
You will need the readBytes and the uncompressed file size to compute the progress for a single file. You can add a new delegate to SSZipArchive to send these data back to the calling code.
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