RNImageToBase64本地模塊崩潰的URL

Question

我試圖將React本地資產轉換爲Base64圖像。

在NativeModules中實現了一個React Native庫，但它在執行getBase64String(url, callback)時崩潰了本機iOS應用程序。發送到RNImageToBase64

例URL（通過react-native-camera生成）：

/var/mobile/Containers/Data/Application/8BE6DA73-73A6-4E9A-BDF9-431726243667/Documents/F76931EE-E8F6-431F-8FFF-D481DDA8CC6B.jpg

失敗的行：

libsystem_kernel.dylib`__abort_with_payload: 
    0x180640d6c <+0>: movz x16, #0x209 
    0x180640d70 <+4>: svc #0x80 
-> 0x180640d74 <+8>: b.lo 0x180640d8c    ; <+32> 
    0x180640d78 <+12>: stp x29, x30, [sp, #-16]! 
    0x180640d7c <+16>: mov x29, sp 
    0x180640d80 <+20>: bl  0x1806257b4    ; cerror_nocancel 
    0x180640d84 <+24>: mov sp, x29 
    0x180640d88 <+28>: ldp x29, x30, [sp], #16 
    0x180640d8c <+32>: ret  

index.ios.js行：

[library assetForURL:url resultBlock:^(ALAsset *asset) { 

在Xcode誤差那叫納提veModules：

NativeModules.RNImageToBase64.getBase64String(uri, (err, base64) => { 
}); 

RNImageToBase64.m的崩潰本地模塊：

#import "RNImageToBase64.h" 
#import <AssetsLibrary/AssetsLibrary.h> 
#import <UIKit/UIKit.h> 

@implementation RNImageToBase64 

RCT_EXPORT_MODULE(); 

RCT_EXPORT_METHOD(getBase64String:(NSString *)input callback:(RCTResponseSenderBlock)callback) 
{ 
    NSURL *url = [[NSURL alloc] initWithString:input]; 
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]; 
    [library assetForURL:url resultBlock:^(ALAsset *asset) { 
    ALAssetRepresentation *rep = [asset defaultRepresentation]; 
    CGImageRef imageRef = [rep fullScreenImage]; 
    NSData *imageData = UIImagePNGRepresentation([UIImage imageWithCGImage:imageRef]); 
    NSString *base64Encoded = [imageData base64EncodedStringWithOptions:0]; 
    callback(@[[NSNull null], base64Encoded]); 
    } failureBlock:^(NSError *error) { 
    NSLog(@"that didn't work %@", error); 
    callback(@[error]); 
    }]; 
} 

@end 

Answer 1

的問題是，它試圖訪問的資產庫的圖像。

我的解決方案由RNImageToBase64模塊的一點修改版本組成，該模塊與磁盤上的文件路徑一起工作。

#import "RNImageToBase64.h" 
#import <AssetsLibrary/AssetsLibrary.h> 
#import <UIKit/UIKit.h> 
#import <ImageIO/ImageIO.h> 

@implementation RNImageToBase64 

RCT_EXPORT_MODULE(); 

RCT_EXPORT_METHOD(getBase64String:(NSString *)input callback:(RCTResponseSenderBlock)callback) 
{ 
    CGImageRef image = MyCreateCGImageFromFile(input); 
    NSData *imageData = UIImagePNGRepresentation([UIImage imageWithCGImage:image]); 
    NSString *base64Encoded = [imageData base64EncodedStringWithOptions:0]; 
    callback(@[[NSNull null], base64Encoded]); 
} 

CGImageRef MyCreateCGImageFromFile (NSString* path) 
{ 
    // Get the URL for the pathname passed to the function. 
    NSURL *url = [NSURL fileURLWithPath:path]; 
    CGImageRef  myImage = NULL; 
    CGImageSourceRef myImageSource; 
    CFDictionaryRef myOptions = NULL; 
    CFStringRef  myKeys[2]; 
    CFTypeRef   myValues[2]; 

    // Set up options if you want them. The options here are for 
    // caching the image in a decoded form and for using floating-point 
    // values if the image format supports them. 
    myKeys[0] = kCGImageSourceShouldCache; 
    myValues[0] = (CFTypeRef)kCFBooleanTrue; 
    myKeys[1] = kCGImageSourceShouldAllowFloat; 
    myValues[1] = (CFTypeRef)kCFBooleanTrue; 
    // Create the dictionary 
    myOptions = CFDictionaryCreate(NULL, (const void **) myKeys, 
            (const void **) myValues, 2, 
            &kCFTypeDictionaryKeyCallBacks, 
            & kCFTypeDictionaryValueCallBacks); 
    // Create an image source from the URL. 
    myImageSource = CGImageSourceCreateWithURL((CFURLRef)url, myOptions); 
    CFRelease(myOptions); 
    // Make sure the image source exists before continuing 
    if (myImageSource == NULL){ 
     fprintf(stderr, "Image source is NULL."); 
     return NULL; 
    } 
    // Create an image from the first item in the image source. 
    myImage = CGImageSourceCreateImageAtIndex(myImageSource, 
               0, 
               NULL); 

    CFRelease(myImageSource); 
    // Make sure the image exists before continuing 
    if (myImage == NULL){ 
     fprintf(stderr, "Image not created from image source."); 
     return NULL; 
    } 

    return myImage; 
} 

@end