確實堅持嘗試編寫代碼來解壓縮iPhone上的文件或目錄。以下是一些用于嘗試解壓縮簡單文本文件的示例代碼。它將文件解壓縮，但已損壞。(void)loadView { NSString *DOCUMENTS_FOLDER = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; NSString *path = [DOCUMENTS_FOLDER stringByAppendingPathComponent:@"sample.zip"]; NSString *unzipeddest = [DOCUMENTS_FOLDER stringByAppendingPathComponent:@"test.txt"]; gzFile file = gzopen([path UTF8String], "rb"); FILE *dest = fopen([unzipeddest UTF8String], "w"); unsigned char buffer[CHUNK]; int uncompressedLength = gzread(file, buffer, CHUNK); if(fwrite(buffer, 1, uncompressedLength, dest) != uncompressedLength || ferror(dest)) { NSLog(@"error writing data"); } else{ } fclose(dest); gzclose(file); }
3 回答
慕蓋茨4494581
TA貢獻1850條經(jīng)驗 獲得超11個贊
我想要一個簡單的解決方案，但在這里找不到我喜歡的解決方案，因此我修改了一個庫以實現(xiàn)自己想要的功能。您可能會發(fā)現(xiàn)SSZipArchive有用。（它也可以順便創(chuàng)建zip文件。）
用法：
NSString *path = @"path_to_your_zip_file";
NSString *destination = @"path_to_the_folder_where_you_want_it_unzipped";
[SSZipArchive unzipFileAtPath:path toDestination:destination];
子衿沉夜
TA貢獻1828條經(jīng)驗 獲得超3個贊
對于gzip，這段代碼對我來說效果很好：
數(shù)據(jù)庫是這樣準備的：gzip foo.db
關(guān)鍵是遍歷gzread（）。上面的示例僅讀取前CHUNK字節(jié)。
#import <zlib.h>
#define CHUNK 16384
NSLog(@"testing unzip of database");
start = [NSDate date];
NSString *zippedDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"foo.db.gz"];
NSString *unzippedDBPath = [documentsDirectory stringByAppendingPathComponent:@"foo2.db"];
gzFile file = gzopen([zippedDBPath UTF8String], "rb");
FILE *dest = fopen([unzippedDBPath UTF8String], "w");
unsigned char buffer[CHUNK];
int uncompressedLength;
while (uncompressedLength = gzread(file, buffer, CHUNK) ) {
// got data out of our file
if(fwrite(buffer, 1, uncompressedLength, dest) != uncompressedLength || ferror(dest)) {
NSLog(@"error writing data");
}
}
fclose(dest);
gzclose(file);
NSLog(@"Finished unzipping database");
順便說一句，我可以在77秒內(nèi)將33MB解壓縮到130MB，或者每秒壓縮約1.7MB。
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