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| 关键词： nbsp NMSMTP Form include char TForm fastcall PostMessageA Unit Fromaddress |
Delphi和C++ Builder都给我们提供了丰富的Internet组件，我们可以利用其编写许多使用的网络代码，以下是我利用C++ Builder 5编写的一个发送邮件Dll的代码： Unit1.CPP#include #include #include ”Unit2.h”#pragma hdrstop//---------------------------------------------------------------------------#pragma argsusedBOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fwdreason, LPVOID lpvReserved){ return 1;}//---------------------------------------------------------------------------extern ”C” int _stdcall SendMail(char *subject,char *content,char *Toaddress,char *Fromaddress,char *SMTPserver,char *Userid);//---------------------------------------------------------------------------int _export _stdcall SendMail(char *subject,char *content,char *Toaddress,char *Fromaddress,char *SMTPserver,char *Userid){ // 1 send a mail success // -1 connect SMTP Server error // -2 send a mail error Form2 = new TForm2(Application); Form2->NMSMTP1->Host = SMTPserver; Form2->NMSMTP1->UserID = Userid; try { Form2->NMSMTP1->Connect(); if (!Form2->NMSMTP1->Connected) {return Form2->errorcode;} //connection error else { Form2->NMSMTP1->PostMessageA->ToAddress->Add(Toaddress); Form2->NMSMTP1->PostMessageA->FromAddress = Fromaddress; Form2->NMSMTP1->PostMessageA->Subject = subject; Form2->NMSMTP1->PostMessageA->Body->Add(content); try { Form2->NMSMTP1->SendMail(); Form2->NMSMTP1->Disconnect(); return 0; } catch(...) { Form2->NMSMTP1->Disconnect(); return -3; } } } catch(...) { return -1; }}由于TNMSMTP类不能单独创建实例，所以我们建立一个Form,Form2来安放NMSMTP1控件，所以有Unit2.cppUnit2.CPP//---------------------------------------------------------------------------#include #pragma hdrstop#include ”Unit2.h”//---------------------------------------------------------------------------#pragma package(smart_init)#pragma resource ”*.dfm”TForm2 *Form2;//---------------------------------------------------------------------------__fastcall TForm2::TForm2(TComponent* Owner) : TForm(Owner){}//---------------------------------------------------------------------------void __fastcall TForm2::NMSMTP1ConnectionFailed(TObject *Sender){ errorcode = -1;}//---------------------------------------------------------------------------void __fastcall TForm2::NMSMTP1AuthenticationFailed(bool &Handled){ errorcode = -2; }//---------------------------------------------------------------------------Unit2.h//---------------------------------------------------------------------------#ifndef Unit2H#define Unit2H//---------------------------------------------------------------------------#include #include #include #include #include #include //---------------------------------------------------------------------------class TForm2 : public TForm{__published: // IDE-managed Components TNMSMTP *NMSMTP1; void __fastcall NMSMTP1ConnectionFailed(TObject *Sender); void __fastcall NMSMTP1AuthenticationFailed(bool &Handled);private: // User declarationspublic: // User declarations int errorcode; __fastcall TForm2(TComponent* Owner);};//---------------------------------------------------------------------------extern PACKAGE TForm2 *Form2;//---------------------------------------------------------------------------#endif 以上Dll只能利用不做认证的SMTP服务器进行Email的发送，对于需要认证的SMTP服务则不能使用，不过可以使用MAPI或者参照SMTP协议编写Socket来实现。 |
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