@但是:
按照上面方法直接取出来的路径是无法传输的,必须自己转化成NSData对象重新写入沙盒路径
// 将原始图片的URL转化为NSData数据,写入沙盒
- (void)imageWithUrl:(NSURL *)url withFileName:(NSString *)fileName
{
// 进这个方法的时候也应该加判断,如果已经转化了的就不要调用这个方法了
// 如何判断已经转化了,通过是否存在文件路径
ALAssetsLibrary *assetLibrary = [[ALAssetsLibrary alloc] init];
// 创建存放原始图的文件夹--->OriginalPhotoImages
NSFileManager * fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:KOriginalPhotoImagePath]) {
[fileManager createDirectoryAtPath:KOriginalPhotoImagePath withIntermediateDirectories:YES attributes:nil error:nil];
}
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
if (url) {
// 主要方法
[assetLibrary assetForURL:url resultBlock:^(ALAsset *asset) {
ALAssetRepresentation *rep = [asset defaultRepresentation];
Byte *buffer = (Byte*)malloc((unsigned long)rep.size);
NSUInteger buffered = [rep getBytes:buffer fromOffset:0.0 length:((unsigned long)rep.size) error:nil];
NSData *data = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:YES];
NSString * imagePath = [KOriginalPhotoImagePath stringByAppendingPathComponent:fileName];
[data writeToFile:imagePath atomically:YES];
} failureBlock:nil];
}
});
}
// 将原始视频的URL转化为NSData数据,写入沙盒
- (void)videoWithUrl:(NSURL *)url withFileName:(NSString *)fileName
{
// 解析一下,为什么视频不像图片一样一次性开辟本身大小的内存写入?
// 想想,如果1个视频有1G多,难道直接开辟1G多的空间大小来写?
ALAssetsLibrary *assetLibrary = [[ALAssetsLibrary alloc] init];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
if (url) {
[assetLibrary assetForURL:url resultBlock:^(ALAsset *asset) {
ALAssetRepresentation *rep = [asset defaultRepresentation];
NSString * videoPath = [KCachesPath stringByAppendingPathComponent:fileName];
char constconst *cvideoPath = [videoPath UTF8String];
FILEFILE *file = fopen(cvideoPath, "a+");
if (file) {
const int bufferSize = 11024 * 1024;
// 初始化一个1M的buffer
Byte *buffer = (Byte*)malloc(bufferSize);
NSUInteger read = 0, offset = 0, written = 0;
NSError* err = nil;
if (rep.size != 0)
{
do {
read = [rep getBytes:buffer fromOffset:offset length:bufferSize error:&err];
written = fwrite(buffer, sizeof(char), read, file);
offset += read;
} while (read != 0 && !err);//没到结尾，没出错，ok继续
}
// 释放缓冲区，关闭文件
free(buffer);
buffer = NULL;
fclose(file);
file = NULL;
}
} failureBlock:nil];
}
});
}
