send messages to another number using whatsappAPI in C#

Question

I want to send a message from my number to another number on whatsApp using whatsApp API in C#. for this I installed WhatsAppi for .NET in visual studio 2013.

Here is the code i am using.

string from = "919586896325";
string to = "919856745896";
string msg = "hello";

WhatsApp wa = new WhatsApp(from, "357168069647463", "abc", false, false);

wa.OnConnectSuccess += () =>
{
    System.Diagnostics.Debug.WriteLine("connected to whatsapp");
    wa.OnLoginSuccess += (phoneNumber, data) =>
    {
         wa.SendMessage(to, msg);
         System.Diagnostics.Debug.WriteLine("Message Sent");
    };

    wa.OnLoginFailed += (data) =>
    {
         System.Diagnostics.Debug.WriteLine(data);
    };

    wa.Login();
};


wa.OnConnectFailed += (ex) =>
{
    System.Diagnostics.Debug.WriteLine("could not connect = {0}", ex);
};

wa.Connect();

when i run this code following output comes.

    connected to whatsapp
A first chance exception of type 'System.FormatException' occurred in mscorlib.dll
'iisexpress.exe' (CLR v4.0.30319: /LM/W3SVC/3/ROOT-1-130858337690371973): Loaded 'C:\Windows\assembly\GAC_MSIL\Microsoft.VisualStudio.Debugger.Runtime\12.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.Debugger.Runtime.dll'. 
could not connect = System.FormatException: Invalid length for a Base-64 char array or string.
   at System.Convert.FromBase64_Decode(Char* startInputPtr, Int32 inputLength, Byte* startDestPtr, Int32 destLength)
   at System.Convert.FromBase64CharPtr(Char* inputPtr, Int32 inputLength)
   at System.Convert.FromBase64String(String s)
   at WhatsAppApi.WhatsAppBase.encryptPassword()
   at WhatsAppApi.WhatsSendBase.addAuthResponse()
   at WhatsAppApi.WhatsSendBase.Login(Byte[] nextChallenge)
   at MessageDiversification.services.MessageDivertService.<>c__DisplayClass5.<SendMessage>b__0() in c:\Users\vitana\Documents\Visual Studio 2013\Projects\MessageDiversification\MessageDiversification\services\MessageDivertService.asmx.cs:line 48
   at WhatsAppApi.WhatsEventBase.fireOnConnectSuccess()
   at WhatsAppApi.WhatsAppBase.Connect()

Can somebody tell how to solve the problem ?

Vlad Bezden · Accepted Answer · 2015-09-04T15:44:45.533

2

You need to encode your password to Base64.

public static string Base64Encode(string text)
{
    return System.Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(text));
}

then call

WhatsApp wa = new WhatsApp(from, Base64Encode("357168069647463"), "abc", false, false);

edited Sep 04 '15 at 15:44

answered Sep 04 '15 at 15:38

Vlad Bezden

83,883
25
248
179

Yeah i did that , i got my encoded password now it says non-authorized – Prakhar Sep 04 '15 at 17:05
I'm glad it worked out. So we resolved that issue. non-authorized is another issue. – Vlad Bezden Sep 04 '15 at 18:20

score 0 · Answer 2 · answered Sep 04 '15 at 15:24

Invalid length for a Base-64 char array or string.

Indicates that you should have used a base-64 encoded string somewhere. Judging from https://github.com/andregsilv/WhatsAppApi/blob/master/WhatsTest/Program.cs (line 29), the password seems to be base64-encoded. Be sure to follow the same pattern as e.g. in C# How to send messages with whatsapi.net?

score 0 · Answer 3 · answered Sep 04 '15 at 15:31

0

the php version that the.net version is derived from has ceased due to legal reasons. there is no real whatsapp api if you google it

answered Sep 04 '15 at 15:31

marcusdev

11
3

send messages to another number using whatsappAPI in C#

3 Answers3