小编gen*_*han的帖子

我正在尝试实现一个Flask后端端点,其中可以上传两个图像,一个背景和一个前景(前景具有透明背景),它将前景粘贴在背景上.我有以下Python代码,我已经测试了本地文件和工作:

background_name = request.args.get("background")
overlay_name = request.args.get("overlay")
output_name = request.args.get("output")

background_data = request.files["background"].read()
overlay_data = request.files["overlay"].read()

background = Image.open(BytesIO(background_data))
overlay = Image.open(BytesIO(overlay_data))

background = background.convert("RGBA")
overlay = overlay.convert("RGBA")

overlay = resize_image(overlay, background.size)
background.paste(overlay, (0, 0, background.size[0], background.size[1],), overlay)
background.save(output_name, "PNG")

但是,当我尝试通过Alamofire和以下代码上传相同的图像时:

Alamofire.upload(multipartFormData: { formData in
        formData.append(bgData, withName: "background", fileName: "background.jpg", mimeType: "image/jpeg")
        formData.append(fgData, withName: "foreground", fileName: "foreground.png", mimeType: "image/png")
    }, to: "http://localhost:8080/image_overlay?background=background%2Ejpg&overlay=overlay%2Epng&output=result%2Epng", encodingCompletion: { result in
        switch result {
        case .success(let upload, _, _):
            upload.validate().responseJSON(completionHandler: { response in
                switch response.result …

我正在尝试实现node.js服务器来监听我的firebase数据库中的更改.这是我初始化服务器的代码:

var admin = require('firebase-admin');
var serviceAccount = require('./SERVICE-ACCOUNT.json');

admin.initializeApp({
  credential: admin.credential.cert(serviceAccount),
  databaseURL: "https://APP-NAME.firebaseio.com"
});

var db = admin.database();
admin.database.enableLogging(true);
var convRef = db.ref('conversations');
convRef.once('value', function(snapshot) {
  console.log("VALUE: " + snapshot.val());
}, function(error) {
  console.log("ERROR: " + error.code);
});

启用调试后,我收到错误:

p:0: Listen called for /conversations default  
p:0: Making a connection attempt  
p:0: Auth token refreshed  
getToken() completed. Creating connection. 
c:0:0: Connection created  
c:0:0:0 Websocket connecting to wss://APP-NAME.firebaseio.com/.ws?v=5  
c:0:0:0 Websocket connected.  
c:0:0: Reset packet received.  New host: s-usc1c-nss-123.firebaseio.com  
c:0:0: Shutting down …

我正在开发一个从 Web API 获取数据的应用程序。大多数时候，它运行得很完美；但是，有时我会收到错误：

malloc: *** error for object 0x7fc2b061de30: double free

*** 在malloc_error_break中设置断点进行调试

我设置了一个 malloc_error_break 断点，当应用程序崩溃时会显示该断点，并突出显示第一行：

0x112375760 <+0>:  pushq  %rbp
0x112375761 <+1>:  movq   %rsp, %rbp
0x112375764 <+4>:  nop    
0x112375765 <+5>:  nopl   (%rax)
0x112375769 <+9>:  popq   %rbp
0x11237576a <+10>: retq   

我不知道这意味着什么。我已经搜索了堆栈交换几个小时，但找不到任何帮助。有一次，错误显示为：

pointer being freed was not allocated

请不要评判我，但我不知道指针是什么，释放某些东西或分配对象意味着什么。如果有人想给我一个快速速成课程和/或启发我我的错误可能是什么，那就太好了。

编辑：我相信错误可能来自 UIImageView 扩展下载图像：

extension UIImageView {
func downloadedFrom(targetURL: NSURL, onCompletion: (UIImage?, NSError?) -> Void) {
    print("downloading image")
    SpotifyAPIManager.sharedInstance.auth.client.get(targetURL.absoluteString, success: { (data, response) in
        print("successfully downloaded image")
        guard (response as NSHTTPURLResponse).statusCode == 200 …

我正在尝试衡量在页面上花费的时间.我试图将开启和关闭时间存储在控制器的实例变量中; 但是,它们要么不初始化要么为零.这是我的代码:

def table
    @numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
    if @time_opened.nil?
        @time_opened = 1
        @open_time = 0.0
        @close_time = 0.0
    else
        @time_opened += 1
    end

    if @open_time > 0.0
        @close_time = Time.now
    end

    @visit = Visit.new({number: @number, time_spent: @close_time - @open_time})
    @visit.save
end

def show
    url = request.url
    @number = url[url.rindex('/')+1..-1]
    @title = @number

    @open_time = Time.now
end

每次显示我想要测量的页面时,都会调用显示.当我检查访问数据时,number为nil,time_spent为0.0.