gistfile1.m

#import "MCFileWriterUtil.h"

@implementation MCFileWriterUtil


RCT_EXPORT_MODULE()


// Expose our method signature to JavaScript :: Persist data
RCT_EXPORT_METHOD(writeFile:(NSString *)fileName
                    withContents:(NSString *)contents
                    errorCallback:(RCTResponseSenderBlock)failureCallback
                    callback:(RCTResponseSenderBlock)successCallback) {
    
    NSLog(@"%@ %@", NSStringFromClass([self class]), NSStringFromSelector(_cmd));

    if ([fileName length] < 1) {
        // Craft a failure message
        NSDictionary *resultsDict = @{
            @"success" : @NO,
            @"errMsg"  : @"No file name."
        };
        
        // Execute the JavaScript failure callback handler
        failureCallback(@[resultsDict]);
        
        return; // Halt execution of this function
    }
    
    // Create an array of directory Paths, to allow us to get the documents directory 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    
    // The documents directory is the first item
    NSString *documentsDirectory = [paths objectAtIndex:0];

    // Create a string that prepends the documents directory path to a text file name
    // using NSString's stringWithFormat method.
    fileName = [NSString stringWithFormat:@"%@/%@", documentsDirectory, fileName];
    NSLog(@"Writing to %@", fileName);
    
    // Initialize an NSError variable
    NSError *writeError;
    
    // Here we save contents to disk by executing the writeToFile method of 
    // the contents String, which is the second argument to this function.
    [contents writeToFile : fileName
                  atomically : NO
                  encoding   : NSStringEncodingConversionAllowLossy
                  error      : &writeError];


    // Error Condition handling
    if (writeError) {
        // Craft a failure message
        NSDictionary *resultsDict = @{
            @"success" : @NO,
            @"errMsg"  : [writeError localizedDescription]
        };
        
        // Execute the JavaScript failure callback handler
        failureCallback(@[resultsDict]);
    }
    // Success handling
    else {
    
        // Craft a success return message
        NSDictionary *resultsDict = @{
            @"success" : @YES
        };
        
        // Call the JavaScript sucess handler
        successCallback(@[resultsDict]);
    }
}

            


// // Expose our method signature to JavaScript :: Load data from disk and return the String.
RCT_EXPORT_METHOD(readFile:(NSString *)fileName
                    errorCallback:(RCTResponseSenderBlock)failureCallback
                    callback:(RCTResponseSenderBlock)successCallback) {

    NSLog(@"%@ %@", NSStringFromClass([self class]), NSStringFromSelector(_cmd));

    if ([fileName length] < 1) {
        // Craft a failure message
        NSDictionary *resultsDict = @{
            @"success" : @NO,
            @"errMsg"  : @"No file name."
        };
        
        // Execute the JavaScript failure callback handler
        failureCallback(@[resultsDict]);
        
        return; // Halt execution of this function
    }
    
    // Create an array of directory Paths, to allow us to get the documents directory 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    
    // The documents directory is the first item
    NSString *documentsDirectory = [paths objectAtIndex:0];

    // Create a string that prepends the documents directory path to a text file name
    // using NSString's stringWithFormat method.
    fileName = [NSString stringWithFormat:@"%@/%@", documentsDirectory, fileName];
    NSLog(@"Writing to %@", fileName);
    
    // Initialize an NSError variable
    NSError *readError;
    
    // Allocate a string and initialize it with the contents of the file via
    // the initWithContentsOfFile instance method.
    NSString *fileContents = [[NSString alloc]
                               initWithContentsOfFile : fileName
                               usedEncoding           : nil
                               error                  : &readError
                             ];

    // Error Condition handling
    if (readError) {
        // Craft a failure message
        NSDictionary *resultsDict = @{
            @"success" : @NO,
            @"errMsg"  : [readError localizedDescription]
        };
        
        // Execute the JavaScript failure callback handler
        failureCallback(@[resultsDict]);
    }
    // Success handling
    else {
        // Craft a success return message
        NSDictionary *resultsDict = @{
            @"success"  : @YES,
            @"contents" : fileContents
        };
        
        // Call the JavaScript sucess handler
        successCallback(@[resultsDict]);
    }
}

@end