Error on iOS with RNFS.read function

[keithdmoore]

When attempting to read a file with RNFS.read like this:

const chunk = await RNFS.read(uri, CHUNK_SIZE, position, 'base64')

I get this error:
[Error: RNFSManager.read(): Error while converting JavaScript argument 1 to Objective C type NSInteger. Objective C type NSInteger is unsupported.]

"react-native-fs": "^2.20.0",
"react-native": "0.76.5",

[keithdmoore]

This issue is with the length and position parameters in RNFSManager.m read method:

Should be:
RCT_EXPORT_METHOD(read:(NSString *)filepath
length: (NSInteger)length
position: (NSInteger)position
resolver:(RCTPromiseResolveBlock)resolve
rejecter:(RCTPromiseRejectBlock)reject)

instead of:
RCT_EXPORT_METHOD(read:(NSString *)filepath
length: (NSInteger *)length
position: (NSInteger *)position
resolver:(RCTPromiseResolveBlock)resolve
rejecter:(RCTPromiseRejectBlock)reject)

Here is a patch file in case others run into this issue:

react-native-fs+2.20.0.patch

[AtilMohAmine]

I am facing the same issue
The patch worked

[dgreasi]

Same issue for me on iOS:

"react-native": "^0.78.2",
"react-native-fs": "2.20.0",

The patch worked