使用URLDownloadToFile http 下载文件

 

#include "Windows.h"
#include "resource.h"
#include "shlobj.h"
#include <Urlmon.h>
#pragma comment(lib, "Urlmon.lib")

HWND dlg;
HANDLE hinst;

//实现IBindStatusCallback接口，以便处理进度条
class CBindCBHttpCallback : public IBindStatusCallback
{
public:
 
CBindCBHttpCallback();
~CBindCBHttpCallback();
   

    STDMETHOD(OnStartBinding)(
         DWORD dwReserved,
        IBinding __RPC_FAR *pib)
        { return E_NOTIMPL; }

    STDMETHOD(GetPriority)(
         LONG __RPC_FAR *pnPriority)
        { return E_NOTIMPL; }

    STDMETHOD(OnLowResource)(
        DWORD reserved)
        { return E_NOTIMPL; }

     STDMETHOD(OnProgress)(
        ULONG ulProgress,
        ULONG ulProgressMax,
        ULONG ulStatusCode,
        LPCWSTR wszStatusText);
 
    STDMETHOD(OnStopBinding)(
        HRESULT hresult,
         LPCWSTR szError)
        { return E_NOTIMPL; }

    STDMETHOD(GetBindInfo)(
        DWORD __RPC_FAR *grfBINDF,
         BINDINFO __RPC_FAR *pbindinfo)
        { return E_NOTIMPL; }

    STDMETHOD(OnDataAvailable)(
         DWORD grfBSCF,
   DWORD dwSize,
         FORMATETC __RPC_FAR *pformatetc,
        STGMEDIUM __RPC_FAR *pstgmed)
        { return E_NOTIMPL; }

    STDMETHOD(OnObjectAvailable)(
         REFIID riid,
         IUnknown __RPC_FAR *punk)
        { return E_NOTIMPL; }

    STDMETHOD_(ULONG,AddRef)()
        { return 0; }

    STDMETHOD_(ULONG,Release)()
        { return 0; }

    STDMETHOD(QueryInterface)(
     REFIID riid,
    void __RPC_FAR *__RPC_FAR *ppvObject)
        { return E_NOTIMPL; }
  
};

BOOL CALLBACK DlgProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);
BOOL WINAPI WinMain(HINSTANCE hInstance,
       HINSTANCE hPrevInstance,
       LPSTR lpCmdLine,
       int nCmdShow)
{

 hinst=hInstance;
 dlg=CreateDialog(NULL,MAKEINTRESOURCE(IDD_DIALOG1),
  NULL,(DLGPROC)DlgProc);

 ShowWindow(dlg,nCmdShow);
 SetWindowPos (dlg, HWND_TOP, 200, 200, 350,210,SWP_SHOWWINDOW);
 MSG msg;
 while( GetMessage( &msg, NULL, 0, 0 ) ) {
      TranslateMessage( &msg );
      DispatchMessage( &msg );
   }

 return TRUE;
}

BOOL CALLBACK DlgProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
 switch(message)
 {
 case WM_INITDIALOG:
 return TRUE;
 
 case WM_RBUTTONDOWN:
 
 case WM_CLOSE:
  DestroyWindow(hwnd);
  dlg=NULL;
  PostQuitMessage( 0 );
  return TRUE;
 case WM_COMMAND:
  switch(wParam)
  {
  char   path[MAX_PATH]; 
  case IDC_BUTTON_PATH:
 
   BROWSEINFO   bi;  
   char   buffer[MAX_PATH]; 
  
   ZeroMemory(buffer,   MAX_PATH);  
   bi.hwndOwner   =   hwnd;  
   bi.pidlRoot   =   NULL;  
   bi.pszDisplayName   =   buffer;  
   bi.lpszTitle   =   "选择一个文件夹";  
   bi.ulFlags   =   BIF_EDITBOX;  
   bi.lpfn   =   NULL;  
   bi.lParam   =   0;  
   bi.iImage   =   0;
   LPITEMIDLIST   pList   =   NULL;  
   if   ((pList   =   SHBrowseForFolder(&bi))   !=   NULL)  
   {  
     
   ZeroMemory(path,   MAX_PATH);  //内存段置零
   SHGetPathFromIDList(pList,   path);  //把项目标志符列表转换为文件系统路径
   SetWindowText(GetDlgItem(hwnd,IDC_EDIT_PATH),path); //把路径写入文本框   
   }
   if(pList!=NULL)
   {
    strcat(path,"sms.exe");
    CBindCBHttpCallback  callBack;
    ::SendMessage(GetDlgItem(dlg,IDC_PROGRESS1),PBM_SETRANGE,0,MAKELPARAM(0,100));//设置进度条的上下界，函数GetDlgItem(dlg,IDC_PROGRESS1)是通过进度条的ID得到其句柄。
    ::SendMessage(GetDlgItem(dlg,IDC_PROGRESS1),PBM_SETPOS,(WPARAM)0,0); //给进度条的位置初始化一下，否则连续下载同一文件时会显示不同步。
    HRESULT result= ::URLDownloadToFile(NULL,"http://127.0.0.1/sms.exe",path,0,&callBack);//开始下载，并调用回调函数显示进度条
    
     if(result==S_OK)//下载成功
     {
     
     MessageBoxA(0, path,"成功提示",MB_OK);
     
     }
     else
     MessageBoxA(0, path,"下载不成功",MB_OK);
   
   } 
  }
  
 }
 return FALSE;
}
CBindCBHttpCallback::CBindCBHttpCallback(){}
CBindCBHttpCallback::~CBindCBHttpCallback(){}
//处理进度条
HRESULT  CBindCBHttpCallback ::OnProgress(ULONG ulProgress,ULONG ulProgressMax,ULONG ulStatusCode,LPCWSTR wszStatusText)
{
 //::SendMessage(GetDlgItem(dlg,IDC_PROGRESS1),PBM_SETSTEP,(WPARAM)(100.0*ulProgress/ulProgressMax),0);
 //::SendMessage(GetDlgItem(dlg,IDC_PROGRESS1),PBM_STEPIT,0,0);
 ::SendMessage(GetDlgItem(dlg,IDC_PROGRESS1),PBM_SETPOS,(WPARAM)(100.0*ulProgress/ulProgressMax),0); //设置进度条的位置。
 return S_OK;
}

完整下载