我正在开发一个iOS应用程序,我使用node.js进行服务器端脚本编写.我在iOS应用程序上将图像上传到服务器时遇到问题.如果我从网页表单上传图片,它工作正常.但是,如果从应用程序端上传它不起作用.
//test file
h3 Pic Upload
form(action='/pic_upload',method='post',enctype='multipart/form-data')
| user_pic:
input(type='file',name='user_pic')
input(type='submit')
//app.js
var userlogin =require('./routes/userlogin');
app.post('/pic_upload',userlogin.picUpload);
//userlogin.js
//picUpload function
exports.picUpload = function(req,res) {
console.log(req.files); // showing undefined,when called from IOS app
// pic upload script...
});
我尝试从应用程序端发送图像作为数据或文件参数,但它不起作用.如何从app端发送文件参数,以便我可以轻松地将图像上传到服务器？请建议一种解决问题的方法.
解决方法
此代码适用于我的应用.试试这个.
NSData *imgData = UIImageJPEGRepresentation(newImg,0.2);
NSString *str = @"displayImage";
NSString *urlString = @"http://some.url.com/post";
// create request
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
[request setHTTPShouldHandleCookies:NO];
[request setTimeoutInterval:30];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"POST"];
NSString *boundary = [NSString stringWithFormat:@"---------------------------14737809831464368775746641449"];
// set Content-Type in HTTP header
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
[request setValue:contentType forHTTPHeaderField: @"Content-Type"];
// post body
NSMutableData *body = [NSMutableData data];
// add params (all params are strings)
[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"currentEventID\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[@"52344457901000006" dataUsingEncoding:NSUTF8StringEncoding]];
// add image data
if (imgData) {
[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// [body appendData:[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"displayImage\"; filename=\"image.jpg\"\r\n"]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"image.jpg\"\r\n",str] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:imgData];
[body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
}
[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// setting the body of the post to the reqeust
[request setHTTPBody:body];
// set URL
[request setURL:[NSURL URLWithString:urlString]];
NSString *bodyStr = [[NSString alloc]initWithData:body encoding:NSUTF8StringEncoding];
NSLog(@" %@",bodyStr);
NSURLConnection *lot_Connection=[[NSURLConnection alloc]initWithRequest:request delegate:self];
if(lot_Connection)
{
webdata = [[NSMutableData alloc] init];
}
