NSIS的下载代码

Name app
OutFile app.exe

!include "mui2.nsh"
!insertmacro MUI_LANGUAGE "SimpChinese"

!define MUI_PAGE_CUSTOMFUNCTION_SHOW MyInstFiles
!insertmacro MUI_PAGE_COMPONENTS
!insertmacro MUI_PAGE_INSTFILES

Function MyInstFiles
 GetDlgItem $0 $HWNDPARENT 1 ;下一步（安装）按钮

 System::Call 'Urlmon.DLL::URLDownloadToFileA(i0, t"http://www.yhxs3344.net/template/wxd_jdbbs/wxd_img/logo.png", t"nsis.png", i0,i0)i.s'
 Pop $r0
 ${If} $r0 = 0
 EnableWindow $0 1
 ${Else}
 EnableWindow $0 0
 ${Endif}
FunctionEnd

Section
SectionEnd