在SOAP接口调用的Http header中增加字段的方法

在 Delphi 中添加 SOAP Header 就不用说了，请参考 Delphi 自带示例，位于 Demos/WebServices/SOAPHeaders 目录下。添加 Http header 字段示例如下。

示例 WSDL 文件描述如下：

SampleServiceSoap = class(IInvokable)
['{08323867-2307-4569-8405-4E575CC3C453}']
procedure SampleProcedure1;
procedure SampleProcedure2;
end;

function GetSampleServiceSoap(UseWSDL: Boolean; Addr: string; HTTPRIO: THTTPRIO): SampleSoap;
const
defWSDL = 'http://127.0.0.1/SampleService.asmx?WSDL';
defURL = 'http://127.0.0.1/SampleService.asmx';
defSvc = 'SampleService';
defPrt = 'SampleServiceSoap';
var
RIO: THTTPRIO;
begin
Result := nil;
if (Addr = '') then
begin
if UseWSDL then
Addr := defWSDL
else
Addr := defURL;
end;
if HTTPRIO = nil then
RIO := THTTPRIO.Create(nil)
else
RIO := HTTPRIO;
try
Result := (RIO as SampleServiceSoap);
if UseWSDL then
begin
RIO.WSDLLocation := Addr;
RIO.Service := defSvc;
RIO.Port := defPrt;
end else
RIO.URL := Addr;
finally
if (Result = nil) and (HTTPRIO = nil) then
RIO.Free;
end;
end;

增加 Http header 示例如下：

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, SOAPHTTPTrans, SOAPHTTPClient, ActiveX;

type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
procedure BeforePost(const HTTPReqResp: THTTPReqResp; Data: Pointer);
public

end;

var
Form1: TForm1;

implementation

{$R *.dfm}

// 在发送请求之前在 http header 中添加 CustomHeader 字段
// Data 是指向 HINTERNET 类型的指针
procedure TForm1.BeforePost(const HTTPReqResp: THTTPReqResp;
Data: Pointer);
const
csCustomHeader = 'CustomHeader:XXXXXXXX'
begin
HttpAddRequestHeaders(Data, PChar(csCustomHeader), Length(csCustomHeader),
HTTP_ADDREQ_FLAG_ADD);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
Soap: SampleServiceSoap;
RIO: THTTPRIO;
begin
CoInitialize(nil);
RIO := THTTPRIO.Create(nil);
try
RIO.HTTPWebNode.OnBeforePost := BeforePost;
Soap := GetSampleServiceSoap(False, 'http://127.0.0.1/SampleService.asmx', RIO);
if Assigned(Soap) then
Soap.SampleProcedure1;
finally
RIO.Free;
CoUninitialize;
end;
end;

end.