在R中的异常处理中分配值 [英] Assigning a value in exception handling in R

问题描述

 while(bo!=10){
  x = tryCatch(getURLContent(Site, verbose = F, curl = handle),
            error = function(e) {
               cat("ERROR1: ", e$message, "\n")
               Sys.sleep(1)
               print("reconntecting...")
               bo <- bo+1
               print(bo)
               })
  print(bo)
  if(bo==0) bo=10 
}

我想尝试在连接失败后每秒重新连接一次。但是bo值的新分配无效。我怎样才能做到这一点？或者，如果您知道如何使用RCurl选项重新连接（我确实没有找到任何东西），那就太神奇了。

I wanted to try reconnecting each second after the connection failed. But the new assignment of the bo value is not effective. How can i do that? Or if you know how to reconnect using RCurl options (I really didn't find a thing) it would be amazing.

感谢所有帮助

推荐答案

问题是分配的 b0 范围。但是，我发现 try 比 tryCatch 更友好。这应该起作用：

The problem is the b0 scope of the assignment. However, I find try a little more friendly than tryCatch. This should work:

while(bo!=10){
    x = try(getURLContent(Site, verbose = F, curl = handle),silent=TRUE)
    if (class(x)=="try-error") {
           cat("ERROR1: ", x, "\n")
           Sys.sleep(1)
           print("reconnecting...")
           bo <- bo+1
           print(bo)
     } else {
           break
     } 
}

以上尝试10次连接到现场。如果任何一次成功，它将退出。

The above attempts 10 times to connect to the site. If any of this time succeeds, it exits.

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