通过 idhttp 带进度条上传演示一下,下载和上传原理差不多,说明一下下面例子中的的idhttp 是动态创建的 


第一步:添加一个StatusBar或者gauge 进度条,这2个都可以。我用的是 statusbar ,因为这个好看,属性保持默认就可。

第二步:获取上传进度需要填写idhttp中的onwork,onworkbegin,onworkend,由于idhttp是动态创建的所以需要覆盖一下。

在主窗体类中添加如下几个公有函数(函数名可随意),记住一定要是一个类的方法,否则报错。





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​[delphi] view plaincopyprint?​


​procedure​​ ​​idhttp_onwork(ASender: TObject; AWorkMode: TWorkMode; ​


​AWorkCount: ​​​​Int64​​​​); ​


​procedure​​ ​​idhttp_beginwork(ASender: TObject; AWorkMode: TWorkMode; ​


​AWorkCountMax: ​​​​Int64​​​​); ​


​procedure​​ ​​idhttp_endwork(ASender: TObject; AWorkMode: TWorkMode);​



  之后编写函数的实现:





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​[delphi] view plaincopyprint?​


​procedure​​ ​​TFormMain​​​​.​​​​idhttp_onwork(ASender: TObject; AWorkMode: TWorkMode; ​


​AWorkCount: ​​​​Int64​​​​); ​


​begin​​ 


​ProgressBar1​​​​.​​​​Position:=AWorkCount ; ​


​end​​​​; ​


​procedure​​ ​​TFormMain​​​​.​​​​idhttp_beginwork(ASender: TObject; AWorkMode: TWorkMode; ​


​AWorkCountMax: ​​​​Int64​​​​); ​


​begin​​ 


​ProgressBar1​​​​.​​​​Max:=AWorkCountMax; ​


​ProgressBar1​​​​.​​​​Min := ​​​​0​​​​; ​


​ProgressBar1​​​​.​​​​Position:=​​​​0​​​​; ​


 


​end​​​​; ​


​procedure​​ ​​TFormMain​​​​.​​​​idhttp_endwork(ASender: TObject; AWorkMode: TWorkMode); ​


​begin​​ 


​//ProgressBar1.Position:=ProgressBar1.Max; ​


​ProgressBar1​​​​.​​​​Position:=​​​​0​​​​; ​



  第三步:在动态创建idhttp的时候 ,像这样写





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​idhttp1 := TIdHTTP​​​​.​​​​Create(); ​


​idhttp1​​​​.​​​​OnWork := FormMain​​​​.​​​​idhttp_onwork; ​


​idhttp1​​​​.​​​​OnWorkBegin := FormMain​​​​.​​​​idhttp_beginwork; ​


​idhttp1​​​​.​​​​OnWorkEnd := FormMain​​​​.​​​​idhttp_endwork; ​



  好了这样就可以了,不过如果上传或下载速度太快的话就无法看到进度条在动