使用Indy TidHttp组件通过sendgrid发送电子邮件文件附件 [英] Using the Indy TidHttp component to send email file attachments through sendgrid

问题描述

我正在使用Indy TIdHTTP 组件，并且能够使用以下功能通过sendgrid API成功发送电子邮件。您可以在此处找到。

现在我的任务是包括文件附件。在API文档中，它指出：文件内容必须是多部分HTTP POST的一部分

我试图修改函数以包括 TIdMultipartFormDataStream 失败。

我应该如何修改代码以支持文件附件？

 过程SendGridEmailProc; 
 var 
 IdHTTP1：TIdHTTP； 
 IdSSLIOHandlerSocket1：TIdSSLIOHandlerSocketOpenSSL; 
 mString：字符串; 
 mParams：TStringList; 
 i：整数； 
开始
尝试
 mParams：= TStringList.Create; 
 IdHTTP1：= TIdHTTP.create（nil）; 
 IdSSLIOHandlerSocket1：= TIdSSLIOHandlerSocketOpenSSL.create（nil）; 
与IdSSLIOHandlerSocket1开始
 SSLOptions.Method：= sslvSSLv3; 
 SSLOptions.Mode：= sslmUnassigned; 
 SSLOptions.VerifyMode：= []; 
 SSLOptions.VerifyDepth：= 2; 
结尾； 
与IdHTTP1一起开始
 IOHandler：= IdSSLIOHandlerSocket1; 
结尾； 
 
 
 mParams.Add（’api_user = xxxxx’）; 
 mParams.Add（’api_key = xxxxx’）; 
 mParams.Add（’to = xxxxxx’）; 
 mParams.Add（’from = xxxxx’）; 
 
 mParams.Add（’subject = test：’+ datetimetostr（now））; 
 
 mParams.Add（’text = this is a test’）; 
 
 IdHTTP1.Post（’https://sendgrid.com/api/mail.send.xml’，mParams）； 
 
 
最终
个mParams。 
 idhttp1.free; 
 IdSSLIOHandlerSocket1.Free; 
结尾； 
结尾； 
  

解决方案

尝试以这种方式进行操作（请注意，未经测试）：

 使用
 IdException，IdHTTP，IdSSLOpenSSL，IdMultipartFormData； 
 
过程SendGridEmailProc; 
 var 
 HTTPClient：TIdHTTP; 
参数：TIdMultiPartFormDataStream; 
 SSLHandler：TIdSSLIOHandlerSocketOpenSSL; 
开始
 HTTPClient：= TIdHTTP.Create（nil）; 
试试
 SSLHandler：= TIdSSLIOHandlerSocketOpenSSL.Create（nil）; 
试试
 SSLHandler.SSLOptions.Method：= sslvSSLv3; 
 SSLHandler.SSLOptions.Mode：= sslmUnassigned; 
 SSLHandler.SSLOptions.VerifyMode：= []; 
 SSLHandler.SSLOptions.VerifyDepth：= 2; 
 HTTPClient.IOHandler：= SSLHandler; 
 
参数：= TIdMultiPartFormDataStream.Create; 
试试
 Parameters.AddFormField（'api_user'，'xxxxx'）; 
 Parameters.AddFormField（'api_key'，'xxxxx'）; 
 Parameters.AddFormField（'to'，'xxxxxx'）; 
 Parameters.AddFormField（'from'，'xxxxx'）; 
 Parameters.AddFormField（'subject'，'test：'+ DateTimeToStr（Now））; 
 Parameters.AddFormField（'text'，'this is a test'）; 
 
 //注意，您需要为文件使用相同的文件名[] 
 //标识符，并且应显式指定
 //类型的内容满足帮助
 Parameters.AddFile（'files [file.jpg]'，'c：\file.jpg'，
'application / octet-stream'）中显示的HTTP转储的文件字段; 
 
试试
 HTTPClient.Post（’https://sendgrid.com/api/mail.send.xml’，
参数）； 
，但E：EIdException上的
除外$ do $$ ShowMessage（E.ClassName +’：’+ E.Message）; 
结尾； 
最终
 Parameters.Free; 
结尾； 
最后
 SSLHandler.Free; 
结尾； 
最终
 HTTPClient.free; 
结尾； 
结尾； 
  

I am using the Indy TIdHTTP component and am successfully able to send emails via the sendgrid API using the following function. The sendgrid api documentation can be found here.

Now I am tasked with including file attachments. In the API documentation it states: The file contents must be part of the multipart HTTP POST

I have attempted to modify my function to include the TIdMultipartFormDataStream with no success.

How should I modify the code to support file attachments?

procedure SendGridEmailProc;
var
  IdHTTP1: TIdHTTP;
  IdSSLIOHandlerSocket1: TIdSSLIOHandlerSocketOpenSSL;
  mString: string;
  mParams: TStringList;
  i: Integer;
begin
  try
    mParams := TStringList.Create;
    IdHTTP1 := TIdHTTP.create(nil);
    IdSSLIOHandlerSocket1 := TIdSSLIOHandlerSocketOpenSSL.create(nil);
    with IdSSLIOHandlerSocket1 do begin
      SSLOptions.Method := sslvSSLv3;
      SSLOptions.Mode :=  sslmUnassigned;
      SSLOptions.VerifyMode := [];
      SSLOptions.VerifyDepth := 2;
    end;
    with IdHTTP1 do begin
      IOHandler := IdSSLIOHandlerSocket1;
    end;


    mParams.Add('api_user=xxxxx');
    mParams.Add('api_key=xxxxx');
    mParams.Add('to=xxxxxx');
    mParams.Add('from=xxxxx');

    mParams.Add('subject=test:'+datetimetostr(now));

    mParams.Add('text=this is a test');

    IdHTTP1.Post('https://sendgrid.com/api/mail.send.xml',mParams);


  finally
    mParams.Free;
    idhttp1.free;
    IdSSLIOHandlerSocket1.Free;
  end;
end;

解决方案

Try to do it this way (note, that it's untested):

uses
  IdException, IdHTTP, IdSSLOpenSSL, IdMultipartFormData;

procedure SendGridEmailProc;
var
  HTTPClient: TIdHTTP;
  Parameters: TIdMultiPartFormDataStream;
  SSLHandler: TIdSSLIOHandlerSocketOpenSSL;
begin
  HTTPClient := TIdHTTP.Create(nil);
  try
    SSLHandler := TIdSSLIOHandlerSocketOpenSSL.Create(nil);
    try
      SSLHandler.SSLOptions.Method := sslvSSLv3;
      SSLHandler.SSLOptions.Mode := sslmUnassigned;
      SSLHandler.SSLOptions.VerifyMode := [];
      SSLHandler.SSLOptions.VerifyDepth := 2;
      HTTPClient.IOHandler := SSLHandler;

      Parameters := TIdMultiPartFormDataStream.Create;
      try
        Parameters.AddFormField('api_user', 'xxxxx');
        Parameters.AddFormField('api_key', 'xxxxx');
        Parameters.AddFormField('to', 'xxxxxx');
        Parameters.AddFormField('from', 'xxxxx');
        Parameters.AddFormField('subject', 'test:' + DateTimeToStr(Now));
        Parameters.AddFormField('text', 'this is a test');

        // note, that you need to use the same file name for the files[]
        // identifier and that you should explicitly specify the content 
        // type for a file field to meet the HTTP dump shown in the help
        Parameters.AddFile('files[file.jpg]', 'c:\file.jpg', 
          'application/octet-stream');

        try
          HTTPClient.Post('https://sendgrid.com/api/mail.send.xml', 
            Parameters);
        except
          on E: EIdException do
            ShowMessage(E.ClassName + ': ' + E.Message);
        end;
      finally
        Parameters.Free;
      end;
    finally
      SSLHandler.Free;
    end;
  finally
    HTTPClient.free;
  end;
end;

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