我正在使用Expo的图像选择器,我得到了这个输出:
Object { "cancelled": false,"height": 468,"uri": "file:///data/user/0/host.exp.exponent/cache/ExperienceData/%2540jbaek7023%252Fstylee/ImagePicker/9a12f0a3-9260-416c-98a6-51911c91ddf4.jpg","width": 468,}
我可以渲染我的图像,但我才意识到URL是手机的本地URI.
我正在使用Redux-Thunk和Axios发送HTTP POST请求:
export const sendPost = ( imageUri,title,content ) => async dispatch => { let response = await axios.post(`${ROOT_URL}/rest-auth/registration/`,{ image,<<<<- I can't put image uri here :( it's LOCAL path title,content }) if(response.data) { dispatch({ type: POST_CREATE_SUCCESS,payload: response.data.token }) } else { dispatch({ type: POST_CREATE_FAIL }) } }
更新我更改了请求调用
let headers = { 'Authorization': `JWT ${token}`}; if(hType==1) { headers = { 'Authorization': `JWT ${token}`}; } else if (hType==2) { headers = { 'Authorization': `Bearer ${token}`}; } let imageData = new FormData(); imageData.append('file',{ uri: image }); let response = await axios.post(`${ROOT_URL}/clothes/create/`,{ image: imageData,text,bigType,onlyMe ... },{headers});
!抱歉复杂但图像变量名称;图像是图像的uri.我不想更改原始变量名的名称
在服务器上,它正在打印
'image': {'_parts': [['file',{'uri': 'file:///data/user/0/host.exp.exponent /cache/ExperienceData/%2540jbaek7023%252Fstylee/ ImagePicker/78f7526a-1dfa-4fc9-b4d7-2362964ab10d.jpg'}]]}
我发现gzip压缩是一种发送图像数据的方法.有帮助吗?
解决方法
另一种选择是将图像转换为base64并发送字符串.缩小通常是base64字符串的大小通常比图像本身大.
像这样的东西:
function readImage(url,callback) { var request = new XMLHttpRequest(); request.onload = function() { var file = new FileReader(); file.onloadend = function() { callback(file.result); } file.readAsDataURL(request.response); }; request.open('GET',url); request.responseType = 'blob'; request.send(); }