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7年前关闭。
我正在使用NSPropertyListSerialization通过Dropbox Sync API同步NSDictionary。写入文件可以正常工作，它会显示在Dropbox中，但尝试读取该文件会导致EXC_BAD_ACCESS崩溃。
这是我写到保管箱的方法:
//Create the dictionary, add the necessary stuff then do this.
NSData *data = [NSPropertyListSerialization dataWithPropertyList:syncPlistDictionary
format:NSPropertyListXMLFormat_v1_0
options:0
error:NULL];
DBError *error = nil;
[syncFile writeData:data error:&error];
if (error) {
NSLog(@"Dropbox Error writing to file: %@", error);
}
[syncFile close];
这可以正常工作，并且永远不会记录该错误。
但是，当我稍后尝试阅读时，它崩溃了。
这是我读取文件的方式:(data参数来自dropbox文件。dropboxSDK在获取此文件时也不会给出错误。)
+ (NSDictionary *)dictionaryWithContentsOfData:(NSData *)data
{
NSData *myData = [data copy];
if ([myData length]==0) {
return [[[NSDictionary alloc] init] autorelease];
}
if (!myData) {
return nil;
}
// uses toll-free bridging for data into CFDataRef and CFPropertyList into NSDictionary
NSError *error = nil;
NSDictionary *dictionary = [NSPropertyListSerialization propertyListWithData:myData
options:0
format:NSPropertyListXMLFormat_v1_0
error:&error];
if (error) {
NSLog(@"NSDictionary Helper Error: %@", error); //This never gets logged because it crashes before getting here.
}
//[myData release]; //I commented this out thinking I was probably releasing it to fast but it made no difference.
return dictionary;
}
我知道了:
+ (NSDictionary *)dictionaryWithContentsOfData:(NSData *)data
{
NSData *myData = [data copy];
if ([myData length]==0) {
return [[[NSDictionary alloc] init] autorelease];
}
if (!myData) {
return nil;
}
// uses toll-free bridging for data into CFDataRef and CFPropertyList into NSDictionary
NSError *error = nil;
NSPropertyListFormat plistFormat;
NSDictionary *dictionary = [NSPropertyListSerialization propertyListWithData:myData
options:0
format:&plistFormat
error:&error];
if (error) {
NSLog(@"NSDictionary Helper Error: %@", error);
}
[myData release];
return dictionary;
}
我要做的就是:用
NSPropertyListFormat plistFormat;和
format:&plistFormat代替
format:NSPropertyListXMLFormat_v1_0