BYTE* tmp = new BYTE[len]疏失，求指点

BYTE* tmp = new BYTE[len]出错，求指点!
本帖最后由 VisualEleven 于 2012-12-05 14:04:53 编辑

DWORD m_dwFileSize; //要下载的图片大小

HGLOBAL m_hGlobal;  //图片保存内存地址

BOOL GetImage(CString imgUrl); //将指定网址的图片保存到m_hGlobal所指内存，同时返回图片大小


BOOL CReadUrlImgDlg::GetImage(CString imgUrl)

{

	BOOL bFlag = TRUE;


    try

    {

		HINTERNET hInternet = NULL;


		hInternet = InternetOpen(_T("session"),INTERNET_OPEN_TYPE_PRECONFIG,NULL,NULL,0);

		if (!hInternet)

		{

			bFlag = FALSE;

			return bFlag;

		}


		HINTERNET hUrl;

		CHAR szHead[] = _T("Accept: */*\r\nAccept-Language: zh-cn\r\n"

			"Accept-Encoding: gzip, deflate\r\nUser-Agent: Mozilla/4.0 "

			"(compatible; MSIE 6.0; Windows NT 5.0; MyIE2; .NET CLR 1.1.4322)");

		hUrl = InternetOpenUrl(hInternet, imgUrl, szHead, lstrlenA(szHead), 

			INTERNET_FLAG_DONT_CACHE | INTERNET_FLAG_PRAGMA_NOCACHE | \

			INTERNET_FLAG_RELOAD,0);

		if (!hUrl)

		{

			bFlag = FALSE;

			//InternetCloseHandle(hInternet);

			return bFlag;

		}


		DWORD length = 1024 * 10;

		DWORD readLength = 0;

		BYTE* pBuffer = NULL;

		BYTE* p = NULL;

        //下载图片

        pBuffer = new BYTE[length];

        memset(pBuffer, 0, length);

        p = pBuffer;

        BOOL read = FALSE;


        do

        {

            read=InternetReadFile(hUrl, p, /*16384*/10240, &readLength);

			if(!read)

			{

				bFlag = FALSE;

				return bFlag;

			}


            if(readLength==0)

                break;


			if ((p-pBuffer+readLength)>=length)  //如果图片大小超过10K

            {

				DWORD len = 2 * length;

                BYTE* tmp = new BYTE[len]; //一运行到这里就出错，求解

                memset(tmp,0,len);

                memcpy(tmp, pBuffer, length);

                int offset=p-pBuffer;

                //delete[] pBuffer;


                pBuffer=tmp;

				delete[] tmp;

				tmp = NULL;

                p=pBuffer+offset;

                length=len;

            }