大家快来看呀，urldownloadtofile耍赖呀！！！！！！！

[wuoaimaomi]

我调用以下代码下载网页文件：
URLDownloadToFile 0&, "www.sohu.com", "c:\aaa.txt", 0&, 0&
可执行后，系统没任何表示，打开C盘，什么文件也没有，怎么URLDOWNLOADTOFILE这么无赖呀，怎么办呀，各位？？？

[fishion]

HRESULT URLDownloadToFile( LPUNKNOWN pCaller,
LPCTSTR szURL,
LPCTSTR szFileName,
DWORD dwReserved,
LPBINDSTATUSCALLBACK lpfnCB
);Parameters

pCaller
A pointer to the controlling IUnknown interface of the calling Microsoft ActiveX component, if the caller is an ActiveX component. If the calling application is not an ActiveX component, this value can be set to NULL. Otherwise, the caller is a Component Object Model (COM) object that is contained in another component, such as an ActiveX control in the context of an HTML page. This parameter represents the outermost IUnknown of the calling component. The function attempts the download in the context of the ActiveX client framework, and allows the caller container to receive callbacks on the progress of the download.
szURL
A pointer to a string value that contains the URL to download. Cannot be set to NULL. If the URL is invalid, INET_E_DOWNLOAD_FAILURE is returned.
szFileName
A pointer to a string value containing the name or full path of the file to create for the download. If szFileName includes a path, the target directory must already exist.
dwReserved
Reserved. Must be set to 0.
lpfnCB
A pointer to the IBindStatusCallback interface of the caller. By using OnProgress, a caller can receive download status. URLDownloadToFile calls the OnProgress and OnDataAvailable methods as data is received. The download operation can be canceled by returning E_ABORT from any callback. This parameter can be set to NULL if status is not required.

[fishion]

szFileName
A pointer to a string value containing the name or full path of the file to create for the download. If szFileName includes a path, the target directory must already exist.

这个是重点，说如果是一个全路径的，当前的文件要存在

[fishion]

看错了，是说路径要存在，而不是说文件要存在

[fishion]

UpdateData(true);
//m_SiteInfo为控件ID_EDIT_CONTENT读应的变量
m_SiteInfo="";
//将变量值传给对应控件

UpdateData(false);
//CDialog::OnOK();
CInternetSession mySession(NULL,0);
CHttpFile* myHttpFile=NULL;
m_SiteInfo="连接到站点"+m_SiteName+"\r\n";
UpdateData(false);

CString myData;
myHttpFile=(CHttpFile*)mySession.OpenURL(m_SiteName);
while(myHttpFile->ReadString(myData))
{
m_SiteInfo=m_SiteInfo+"\r\n";
m_SiteInfo+=myData;
}
myHttpFile->Close ;
mySession.Close ;
UpdateData(false);

只不过如果是下载网页代码的，一般是用我上面的方面

[noenoughmemory]

不懂，帮顶

[opens555]

不懂，帮顶