Making a cURL call in C

Question

I want to make the following curl call in my C  console application     curl -d  text This is a block of text        http   api repustate com v2 demokey score json   I tried to do like the question posted here  but I cannot fill the properties properly   I also tried to convert it to a regular HTTP request   http   api repustate com v2 demokey score json text  This 20is 20a 20block 20of 20text    Can I convert a cURL call to an HTTP request   If so  how   If not  how can I make the above cURL call from my C  console application properly

User · Accepted Answer

Well  you wouldn t call cURL directly  rather  you d use one of the following options    HttpWebRequest HttpWebResponse WebClient HttpClient  available from  NET 4 5 on    I d highly recommend using the HttpClient class  as it s engineered to be much better  from a usability standpoint  than the former two   In your case  you would do this   using System Net Http   var client   new HttpClient        Create the HttpContent for the form to be posted  var requestContent   new FormUrlEncodedContent new          new KeyValuePair lt string  string gt   text    This is a block of text            Get the response  HttpResponseMessage response   await client PostAsync       http   api repustate com v2 demokey score json       requestContent       Get the response content  HttpContent responseContent   response Content      Get the stream of the content  using  var reader   new StreamReader await responseContent ReadAsStreamAsync              Write the output      Console WriteLine await reader ReadToEndAsync         Also note that the HttpClient class has much better support for handling different response types  and better support for asynchronous operations  and the cancellation of them  over the previously mentioned options

User · Answer

Call cURL from your console app is not a good idea   But you can use TinyRestClient which make easier to build requests    var client   new TinyRestClient new HttpClient    https   api repustate com      client PostRequest  v2 demokey score json    AddQueryParameter  text        ExecuteAsync lt MyResponse gt

User · Answer

Well if you are new to C  with cmd-line exp  you can use online sites like  https   curl olsh me   or search curl to C  converter will returns site that could do that for you   or if you are using postman you can use Generate Code Snippet only problem with Postman code generator is the dependency on RestSharp library

User · Answer

Below is a working example code  Please note you need to add a reference to Newtonsoft Json Linq string url    quot https   yourAPIurl quot   WebRequest myReq   WebRequest Create url   string credentials    quot xxxxxxxxxxxxxxxxxxxxxxxx yyyyyyyyyyyyyyyyyyyyyyyyyyyyyy quot   CredentialCache mycache   new CredentialCache    myReq Headers  quot Authorization quot      quot Basic  quot    Convert ToBase64String Encoding ASCII GetBytes credentials    WebResponse wr   myReq GetResponse    Stream receiveStream   wr GetResponseStream    StreamReader reader   new StreamReader receiveStream  Encoding UTF8   string content   reader ReadToEnd    Console WriteLine content   var json    quot   quot    content    quot   quot      change this to array var objects   JArray Parse json      parse as array   foreach  JObject o in objects Children lt JObject gt           foreach  JProperty p in o Properties                  string name   p Name          string value   p Value ToString            Console Write name    quot    quot    value           Console ReadLine     Reference  TheDeveloperBlog com

User · Answer

Late response but this is what I ended up doing  If you want to run your curl commands very similarly as you run them on linux and you have windows 10 or latter do this       public static string ExecuteCurl string curlCommand  int timeoutInSeconds 60                if  string IsNullOrEmpty curlCommand               return              curlCommand   curlCommand Trim                remove the curl keworkd         if  curlCommand StartsWith  curl                          curlCommand   curlCommand Substring  curl  Length  Trim                          this code only works on windows 10 or higher                        curlCommand   curlCommand Replace  --compressed                        windows 10 should contain this file             var fullPath   System IO Path Combine Environment SystemDirectory   curl exe                 if  System IO File Exists fullPath     false                                if  Debugger IsAttached    Debugger Break                      throw new Exception  Windows 10 or higher is required to run this application                                  on windows   are not supported  For example  curl  http   ublux com  does not work and it needs to be replaced to curl  http   ublux com              List lt string gt  parameters   new List lt string gt                      separate parameters to escape quotes             try                               Queue lt char gt  q   new Queue lt char gt                      foreach  var c in curlCommand ToCharArray                                          q Enqueue c                                      StringBuilder currentParameter   new StringBuilder                     void insertParameter                                         var temp   currentParameter ToString   Trim                        if  string IsNullOrEmpty temp     false                                                parameters Add temp                                              currentParameter Clear                                       while  true                                        if  q Count    0                                                insertParameter                            break                                             char x   q Dequeue                         if  x                                                        insertParameter                                add until we find last                           while  true                                                        x   q Dequeue                                    if next 2 characetrs are                                 if  x          amp  amp  q Count  gt  0  amp  amp  q Peek                                                                          currentParameter Append                                        q Dequeue                                    continue                                                             if  x                                                                        insertParameter                                    break                                                             currentParameter Append x                                                                       else if  x                                                       insertParameter                                add until we find last                           while  true                                                        x   q Dequeue                                    if next 2 characetrs are                                if  x          amp  amp  q Count  gt  0  amp  amp  q Peek                                                                         currentParameter Append                                       q Dequeue                                    continue                                                             if  x                                                                       insertParameter                                    break                                                             currentParameter Append x                                                                       else                                               currentParameter Append x                                                                     catch                               if  Debugger IsAttached    Debugger Break                      throw new Exception  Invalid curl command                               StringBuilder finalCommand   new StringBuilder                 foreach  var p in parameters                                if  p StartsWith  -                                          finalCommand Append p                       finalCommand Append                           continue                                     var temp   p                   if  temp Contains                                              temp   temp Replace                                                  if  temp Contains                                             temp   temp Replace                                                 finalCommand Append      temp                       finalCommand Append                                   using  var proc   new Process                               StartInfo   new ProcessStartInfo                                       FileName    curl exe                       Arguments   finalCommand ToString                        UseShellExecute   false                      RedirectStandardOutput   true                      RedirectStandardError   true                      CreateNoWindow   true                      WorkingDirectory   Environment SystemDirectory                                                                proc Start                     proc WaitForExit timeoutInSeconds 1000                    return proc StandardOutput ReadToEnd                                    The reason why the code is a little bit long is because windows will give you an error if you execute a single quote  In other words  the command curl  https   google com  will work on linux and it will not work on windows  Thanks to that method I created you can use single quotes and run your curl commands exactly as you run them on linux  This code also checks for escaping characters such as    and       For example use this code as   var output   ExecuteCurl   curl  https   google com  -H  Accept  application json  text javascript       q 0 01      If you where to run that same string agains C  Windows System32 curl exe it will not work because for some reason windows does not like single quotes

User · Answer

I know this is a very old question but I post this solution in case it helps somebody  I recently met this problem and google led me here  The answer here helps me to understand the problem but there are still issues due to my parameter combination  What eventually solves my problem is curl to C  converter  It is a very powerful tool and supports most of the parameters for Curl  The code it generates is almost immediately runnable

User · Answer

Or in restSharp   var client   new RestClient  https   example com  urlparam true    var request   new RestRequest Method POST   request AddHeader  content-type    application x-www-form-urlencoded    request AddHeader  cache-control    no-cache    request AddHeader  header1    headerval    request AddParameter  application x-www-form-urlencoded    bodykey bodyval   ParameterType RequestBody   IRestResponse response   client Execute request

User · Answer

Don t forget to add System Net Http  specially if you receive this error   Severity  Code    Description Project File    Line    Suppression State Error CS0246  The type or namespace name  HttpClient  could not be found  are you missing a using directive or an assembly reference     1 default aspx  D  Projetos Testes FacebookAPI FB-CustomAudience default aspx cs    56  Active  In this case you shoud   Add System Net Http from Nuget  Tools   NuGet Package Manager   Manager NuGet Packages for Solution  Search for System Net Http Add in the top of your page the follow code  using System Net Http

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