使用ASIHTTPRequest或圖像調整大小的內存問題

Question

我不知道在哪裏，但我有內存問題上傳圖像到我的服務器。大約10次左右成功上傳後，我得到了1級的內存警告，然後下一次退出時由於DateFormatters或基本上內存不足。這是我的代碼。它使用ASIHTTPDataRequest和一個圖像大小調整功能。我不能告訴如果它的請求沒有被釋放，或者如果它的圖像大小調整功能不釋放圖像。圖像是以正常的高分辨率從手機拍攝的巨大照片，然後調整爲打印尺寸並上傳。在某處，我錯過了某處的內存管理，它讓我瘋狂！

我在使用以下代碼將大約10次或更多上傳到我的服務器後收到內存警告。有沒有特定於ASI的內存管理，我沒有使用？

嗨我正在使用你的軟件，但我遇到了巨大的內存問題。我收到了內存警告，我不確定如何在不中斷上傳的情況下清除它們。 我想知道你是否可以看看這個代碼示例，也許告訴我我做錯了什麼導致內存問題？

我在使用以下代碼將大約10次或更多上傳到我的服務器後收到內存警告。有沒有特定於ASI的內存管理，我沒有使用？

嗨我正在使用你的軟件，但我遇到了巨大的內存問題。我收到了內存警告，我不確定如何在不中斷上傳的情況下清除它們。 我想知道你是否可以看看這個代碼示例，也許告訴我我做錯了什麼導致內存問題？

我在使用以下代碼將大約10次或更多上傳到我的服務器後收到內存警告。有沒有特定於ASI的內存管理，我沒有使用？

嗨我正在使用你的軟件，但即時通訊運行到巨大的內存問題。我收到了內存警告，我不確定如何在不中斷上傳的情況下清除它們。 我想知道你是否可以看看這個代碼示例，也許告訴我我做錯了什麼導致內存問題？

-(void)uploadPhoto:(UploadObject*)upObject{ 
UIImage *image=[UIImage imageWithContentsOfFile:[upObject.imageObj.imageList objectAtIndex:0]]; 
if([upObject.imageObj.imgType isEqualToString:@"SINGLE"]){ 
    image=[self image:image ByScalingAndCroppingForSize:CGSizeMake(1800, 1200)]; 
}else if([upObject.imageObj.imgType isEqualToString:@"STANDARD8X10"]){ 
    image=[self image:image ByScalingAndCroppingForSize:CGSizeMake(3000, 2400)]; 
}else if([upObject.imageObj.imgType isEqualToString:@"MOUSE"]){ 
    image=[self image:image ByScalingAndCroppingForSize:CGSizeMake(2850, 2400)]; 
}else{ 
    image=[self image:image ByScalingAndCroppingForSize:CGSizeMake(1800, 1200)]; 
} 
NSFileManager *fileManager = [NSFileManager defaultManager]; 
[fileManager setDelegate:self]; 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; 
NSData *data = [NSData dataWithData:UIImageJPEGRepresentation(image, 100.0f)];//1.0f = 100% quality 
[data writeToFile:[upObject.imageObj.imageList objectAtIndex:0] atomically:YES]; 
__block ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:[NSURL URLWithString:@"http://api.postalpix.com/order/new"]]; 
[request setPostValue:upObject.imageObj.pixID forKey:@"uid"]; 
[request setPostValue:upObject.orderID forKey:@"orderid"]; 
[request setPostValue:upObject.cost forKey:@"total"]; 
[request setPostValue:@"NONE" forKey:@"coupon"]; 
[request setPostValue:[NSString stringWithFormat:@"%d",upObject.total] forKey:@"images"]; 
[request setPostValue:upObject.block forKey:@"block"]; 
[request setPostValue:currentCoupon forKey:@"coupon"]; 
[request setPostValue:[NSString stringWithFormat:@"%d",[upObject.imageObj.copies intValue]] forKey:@"quantity"]; 
[request setTimeOutSeconds:20]; 
request.showAccurateProgress = YES; 
[request setUploadProgressDelegate:self]; 
[request setDelegate:self]; 
[request setFile:[upObject.imageObj.imageList objectAtIndex:0] forKey:@"upfile"]; 
if ([upObject.imageObj.imgType isEqualToString:@"SINGLE"]) 
{ 
    [request setPostValue:@"29375" forKey:@"sku"]; 
    [request setPostValue:@"4x6 Print" forKey:@"description"]; 

}else if ([upObject.imageObj.imgType isEqualToString:@"MOUSE"]) 
{ 
    [request setPostValue:@"28925" forKey:@"sku"]; 
    [request setPostValue:@"Photo Mouse Pad" forKey:@"description"]; 
}else if ([upObject.imageObj.imgType isEqualToString:@"STANDARD8X10"]) 
{ 
    [request setPostValue:@"29376" forKey:@"sku"]; 
    [request setPostValue:@"8x10 Print" forKey:@"description"]; 
} 
request.shouldContinueWhenAppEntersBackground=YES; 
[request setCompletionBlock:^{ 
    NSDictionary *jo=[[request responseString] JSONValue]; 
    NSFileManager *fileManager = [NSFileManager defaultManager]; 
    [fileManager removeItemAtPath:[currentUp.imageObj.imageList objectAtIndex:0] error:NULL]; 
    [self removeFinishedUpload:currentUp.block]; 
    currentUp=[self getNextUploadObject]; 
    if(currentUp){ 
    [self uploadPhoto:currentUp]; 
    }else{ 
    currentUploadCount=0; 
    [[NSNotificationCenter defaultCenter] postNotificationName:@"UPDATEMOREBADGE" object:nil]; 
    isUploading=NO; 
    [[NSNotificationCenter defaultCenter] postNotificationName:@"HIDE_PROGRESS" object:nil]; 
    } 
}]; 
[request setFailedBlock:^{ 
    NSError *error = [request error]; 
    [self restartUpload]; 
}]; 
[request startAsynchronous]; 
} 


- (UIImage*)image:(UIImage *)image ByScalingAndCroppingForSize:(CGSize)targetSize 
{ 
UIImage *sourceImage = image; 
UIImage *newImage = nil;   
CGSize imageSize = sourceImage.size; 
CGFloat width = imageSize.width; 
CGFloat height = imageSize.height; 
CGFloat targetWidth = targetSize.width; 
CGFloat targetHeight = targetSize.height; 
CGFloat scaleFactor = 0.0; 
CGFloat scaledWidth = targetWidth; 
CGFloat scaledHeight = targetHeight; 
CGPoint thumbnailPoint = CGPointMake(0.0,0.0); 

if (CGSizeEqualToSize(imageSize, targetSize) == NO) 
{ 
     CGFloat widthFactor = targetWidth/width; 
     CGFloat heightFactor = targetHeight/height; 

     if (widthFactor > heightFactor) 
    scaleFactor = widthFactor; // scale to fit height 
     else 
    scaleFactor = heightFactor; // scale to fit width 
     scaledWidth = width * scaleFactor; 
     scaledHeight = height * scaleFactor; 

     // center the image 
     if (widthFactor > heightFactor) 
    { 
    thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5; 
    } 
     else 
    if (widthFactor < heightFactor) 
    { 
    thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5; 
    } 
}  

UIGraphicsBeginImageContext(targetSize); // this will crop 

CGRect thumbnailRect = CGRectZero; 
thumbnailRect.origin = thumbnailPoint; 
thumbnailRect.size.width = scaledWidth; 
thumbnailRect.size.height = scaledHeight; 

[sourceImage drawInRect:thumbnailRect]; 

newImage = UIGraphicsGetImageFromCurrentImageContext(); 
if(newImage == nil) 
     UIGraphicsEndImageContext(); 
return newImage; 
} 

Answer 1

我覺得行

if(newImage == nil) 
    UIGraphicsEndImageContext(); 

是不正確的。必須在沒有條件的情況下調用UIGraphicsEndImageContext()。