前言：
1、公司delphi7开发的传统软件还活得好好的，但是大家都知道delphi早已经日落西山了，现在成了后进、追随者。细细算了已经6、7不用了。新的delphixe7呢，没有时间成本去适应和研究。
由于大量使用了第3方的组件和控件，想升级估计是吃力不讨好的事情...
2、保留原有代码，开发新功能可调用远程主机（云主机）的REST ful风格的api,使用Json交换数据。这样就赶上了新潮流，复活了。
由于网上搜索了很多次，发现符合需求的文章很少，这里记录下来，授人以鱼吧。
以下是关键代码：
（1）msxml,SuperObject（第3方,delphi7不自带）, EncdDecd 的引用
（2）XMLHttpRequest的使用：
//提交会员开卡信息procedure TFormMakeCard.btnOKClick(Sender: TObject); var url: string; resultJson,paramsJson: ISuperObject;begin if (CheckInput) then begin HttpReq := CoXMLHTTPRequest.Create; //两种提交请求的方式：Get和Post,Get是通过URL地址传递参数如果是中文需要转码，需要添加时间戳 Post不需要添加时间戳 //get url := 'http://localhost:5269/api/webmemberapi/NewMemberRegister?timestamp='+inttostr(Windows.GetTickCount); url := 'http://localhost:5269/api/webmemberapi/NewMemberRegister?'; HttpReq.open('Post', url, False, EmptyParam, EmptyParam); //http post HttpReq.setRequestHeader('Accept', 'application/json'); HttpReq.setRequestHeader('Content-Type', 'application/json'); //请求主体 try paramsJson:= GetMemberEntity(); Memo1.Lines.Clear; memo1.Text := paramsJson.AsString(); HttpReq.send(paramsJson.AsString()); resultJson:=SO(HttpReq.responseText); if (resultJson<>nil) then begin showmessage(resultJson.S['Message']); //发卡成功，如果有照片或者签名则执行上传 if (resultJson.B['Success']=true) then begin if (mbPhoto) then begin url := 'http://localhost:5269/api/webmemberapi/UploadMemberImage?'; HttpReq.open('Post', url, False, EmptyParam, EmptyParam); //http post HttpReq.setRequestHeader('Accept', 'application/json'); HttpReq.setRequestHeader('Content-Type', 'application/json'); paramsJson:=SO(); paramsJson.S['ImageFileContent']:= BitmapToString(ImageMemberPhoto.Picture.Bitmap); paramsJson.S['ImageCategory']:='头像'; paramsJson.S['MemberCardNo']:=self.edtCardNo.Text; HttpReq.send(paramsJson.AsString()); resultJson:=SO(HttpReq.responseText); end; if (mbSign) then begin url := 'http://localhost:5269/api/webmemberapi/UploadMemberImage?'; HttpReq.open('Post', url, False, EmptyParam, EmptyParam); //http post HttpReq.setRequestHeader('Accept', 'application/json'); HttpReq.setRequestHeader('Content-Type', 'application/json'); paramsJson:=SO(); paramsJson.S['ImageFileContent']:= BitmapToString(ImageMemberSign.Picture.Bitmap);; paramsJson.S['ImageCategory']:='签名'; paramsJson.S['MemberCardNo']:=self.edtCardNo.Text; HttpReq.send(paramsJson.AsString()); resultJson:=SO(HttpReq.responseText); end; end; end; except on Ex:Exception do showmessage(Ex.Message); end; end;end;
//XMLHttpRequest实例化
HttpReq := CoXMLHTTPRequest.Create;
//两种提交请求的方式：Get和Post,Get是通过URL地址传递参数如果是中文需要转码，需要添加时间戳 Post不需要添加时间戳
//get url := 'http://localhost:5269/api/webmemberapi/NewMemberRegister?timestamp='+inttostr(Windows.GetTickCount);
url := 'http://localhost:5269/api/webmemberapi/NewMemberRegister?';
// Post或者Get
HttpReq.open('Post', url, False, EmptyParam, EmptyParam);
//http post **这是关键代码**RequestHeader的设置'application/json',服务器端才能识别为Json
HttpReq.setRequestHeader('Accept', 'application/json');
HttpReq.setRequestHeader('Content-Type', 'application/json');
//这是请求的主体
HttpReq.send(paramsJson.AsString());
//把服务器返回的Json字符串反序列化成一个SuperObject对象。
resultJson:=SO(HttpReq.responseText);
using System;using System.Collections.Generic;using System.Linq;using System.Web;namespace Com.Aidpoint.MemberApi.Models{ /// <summary> /// Action返回值实体 /// </summary> public class ApiActionResult { public bool Success { get; set; } public string Message { get; set; } public object Result { get; set; } }}
if (resultJson<>nil) then
begin
showmessage(resultJson.S['Message']);
//发卡成功，如果有照片或者签名则执行上传
if (resultJson.B['Success']=true) then ...
end
(3)Josn包含base64编码的图片:
//位图文件转Base64字符串function TFormMakeCard.BitmapToString(img:TBitmap):string;var ms:TMemoryStream; ss:TStringStream; s:string;begin ms := TMemoryStream.Create; img.SaveToStream(ms); ss := TStringStream.Create(''); ms.Position:=0; EncodeStream(ms,ss);//将内存流编码为base64字符流 s:=ss.DataString; ms.Free; ss.Free; result:=s;end;url := 'http://localhost:5269/api/webmemberapi/UploadMemberImage?'; HttpReq.open('Post', url, False, EmptyParam, EmptyParam); //http post HttpReq.setRequestHeader('Accept', 'application/json'); HttpReq.setRequestHeader('Content-Type', 'application/json'); paramsJson:=SO(); paramsJson.S['ImageFileContent']:= BitmapToString(ImageMemberPhoto.Picture.Bitmap); paramsJson.S['ImageCategory']:='头像'; paramsJson.S['MemberCardNo']:=self.edtCardNo.Text; HttpReq.send(paramsJson.AsString()); resultJson:=SO(HttpReq.responseText);
(4)服务器端的web api
public ApiActionResult NewMemberRegister([FromBody]MemberDTO memberDTO) { //初始化返回值 var result = new ApiActionResult() { Success = false, Result = null, Message = "操作失败。" }; if (memberDTO != null) { try { using (MemberEntities db = new MemberEntities()) { var dbEntity = CheckMemberExists(memberDTO, db); if (dbEntity==null) { //插入会员表 var entity = DTO2Entity.ConvertToEntityObject<会员表>(memberDTO) as 会员表; db.AddTo会员表(entity); //生成储值流水--w:误收,d:积分兑换礼品,f:发新卡,c:储值,q:取款,j:积分消费记录 var detailRec = new 会员储值流水表(); detailRec.会员卡号 = memberDTO.卡号; detailRec.储值标志 = "f"; detailRec.充值金额 = memberDTO.开卡额.Value; detailRec.新卡 = "Y"; db.AddTo会员储值流水表(detailRec); try { db.SaveChanges(); result.Success = true; result.Result = entity; result.Message = string.Format("操作成功。新发会员卡[{0}],开卡金额:{1}。", entity.自编号, entity.开卡额); } catch (Exception ex) { var exx = ex.InnerException == null ? ex : ex.InnerException; throw new Exception(exx.Message); } } else { result.Success = false; result.Result = null; result.Message = string.Format("卡号[{0}]已经存在。发卡门店[{1}],持卡人:{2}。",dbEntity.自编号,dbEntity.发行分店编号,dbEntity.姓名); } } } catch (Exception ex) { var exx = ex.InnerException == null ? ex : ex.InnerException; result.Success = false; result.Result = exx; result.Message = string.Format("操作异常,异常消息：{0}。", exx.Message); } } return result; }
联系客服
