我正在制作图片上传网站。
用户可以通过相机拍照并上传。
我正在使用iPhone 5S进行测试
但是,从iPhone上显示的照片在PC上以错误的方向显示,并且在移动设备中显示正确的方向。
在我的电脑中:
正确的方向(iPhone中的方向显示)
在我的上传过程中,我对图片一无所知,我使用Express
和multer
:
var storage = multer.diskStorage({
destination: function(req, file, cb) {
cb(null, 'public/uploads');
},
filename: function(req, file, cb) {
var name = file.originalname;
var dot = name.lastIndexOf('.');
cb(null, name.slice(0, dot) + '-' + new Date().getTime() + name.slice(dot));
}
});
var upload = multer({
storage: storage,
fileFilter: function(req, file, cb) {
if (/\.(png|jpg)$/.test(file.originalname)) {
cb(null, true);
} else {
cb(null, false);
}
}
});
var fileUpload = upload.single('file');
router.post('/ajaxupload', function(req, res) {
fileUpload(req, res, function(err) {
if (err) {
res.json({
success: false,
message: 'upload failed'
});
return;
}
console.log(req.file);
res.json({
success: true,
filename: req.file.path.replace(/public/, '')
});
});
});
答案 0 :(得分:0)
调用图像方向更改的方法
- (UIImage *)changeOrientation:(UIImage *)image {
if (image.imageOrientation == UIImageOrientationUp) return image;
CGAffineTransform transform = CGAffineTransformIdentity;
switch (image.imageOrientation) {
case UIImageOrientationDown:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, image.size.width, image.size.height);
transform = CGAffineTransformRotate(transform, M_PI);
break;
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
transform = CGAffineTransformTranslate(transform, image.size.width, 0);
transform = CGAffineTransformRotate(transform, M_PI_2);
break;
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, 0, image.size.height);
transform = CGAffineTransformRotate(transform, -M_PI_2);
break;
case UIImageOrientationUp:
case UIImageOrientationUpMirrored:
break;
}
switch (image.imageOrientation) {
case UIImageOrientationUpMirrored:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, image.size.width, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;
case UIImageOrientationLeftMirrored:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, image.size.height, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;
case UIImageOrientationUp:
case UIImageOrientationDown:
case UIImageOrientationLeft:
case UIImageOrientationRight:
break;
}
CGContextRef ctx = CGBitmapContextCreate(NULL, image.size.width, image.size.height,
CGImageGetBitsPerComponent(image.CGImage), 0,
CGImageGetColorSpace(image.CGImage),
CGImageGetBitmapInfo(image.CGImage));
CGContextConcatCTM(ctx, transform);
switch (image.imageOrientation) {
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
CGContextDrawImage(ctx, CGRectMake(0,0,image.size.height,image.size.width), image.CGImage);
break;
default:
CGContextDrawImage(ctx, CGRectMake(0,0,image.size.width,image.size.height), image.CGImage);
break;
}
CGImageRef cgimg = CGBitmapContextCreateImage(ctx);
UIImage *img = [UIImage imageWithCGImage:cgimg];
CGContextRelease(ctx);
CGImageRelease(cgimg);
return img;
}