程序莫名其妙的崩溃，加断点刚进入函数就崩溃，断点不往下走，读取图片数据到程序并保存到一个HBITMAP 中

HPR_INT32 CCarManageDlg::DrawPic2UIForm(IUIFormObj* pUIForm,string& strPicName)
{//程序崩溃的地方
 HPR_INT32 iReval=HPR_ERROR;
 char* buff=NULL;
 do
 {
  if (NULL == pUIForm||strPicName=="")
  {
   CLIENT_ERROR("DrawPic2UIForm into paras is wrong ");
   break;
  }
   //buff= g_MemPool.MemAlloc(PICTURE_SIZE);

char buff[10*1024*1024]={0};//出现崩溃的地方，这里申请的内存太大，线程的堆栈没有这么大的内存所以会在函数刚进入的地方就崩溃，断点都不会往下走；
  if (buff ==NULL)
  {
   CLIENT_ERROR(" g_MemPool.MemAlloc fialed ");
   break;
  }
  HPR_UINT32 iLen=0;
  if (ReadFlagPicData(strPicName,buff,iLen)!=HPR_OK)
  {
   CLIENT_ERROR("ReadFlagPicData failed %s ",strPicName.c_str());
   break;
  }
  char* pData =buff; //(char*)strPicContext.c_str();
  int dataLen =iLen;
  CImage img;
  IStream* pIStream;
  HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, dataLen);
  if (!hGlobal)
  {
   CLIENT_ERROR("GlobalAlloc failed  %s ",strPicName.c_str());
   break;
  }
  void* pBuf = GlobalLock(hGlobal);
  memcpy(pBuf, (void*)pData, dataLen);
  GlobalUnlock(hGlobal);
  HRESULT hr = CreateStreamOnHGlobal(hGlobal,TRUE,&pIStream);
  if(S_OK == img.Load(pIStream))
  {
   HBITMAP hBmp = img.Detach();
   if (hBmp != NULL)
   {
    pUIForm->SetBackBitmap((OLE_HANDLE)hBmp);
    ::DeleteObject(hBmp);
   }
  }
  if (pIStream)
  {
   pIStream->Release();
  }
  GlobalFree(hGlobal);
  iReval=HPR_OK;
 } while (0);
 if (iReval!=HPR_OK)
 {
  if (pUIForm)
  {
   pUIForm->SetDrawColor(TRUE);
  }
 }
 if (buff!=NULL)
 {
  g_MemPool.MemRstore(buff);
 }
 return iReval;
}
HPR_INT32 CCarManageDlg::ReadFlagPicData(string strPicName,char* buff,HPR_UINT32& iLen)
{
 HPR_INT32 iReval=HPR_ERROR;
 do
 {
  if (strPicName=="")
  {
   break;
  }
  HPR_HANDLE DirFlag=HPR_OpenDir("countryflag");
  if (DirFlag==NULL)
  {
   CLIENT_ERROR("open dir countryflag failed");
   break;
  }
  HPR_FILEFIND_INFO FileInfo;
  HPR_Snprintf(FileInfo.sFileName,HPR_MAX_PATH,"%s",strPicName.c_str());
  if (HPR_FindFileInDir(DirFlag,&FileInfo)==HPR_ERROR)
  {
   CLIENT_ERROR("HPR_FindFileInDir %s faild ",strPicName.c_str());
   break;
  }
  strPicName="./countryflag/"+strPicName;
  strPicName=strPicName+".png";
  HPR_HANDLE hFile=HPR_OpenFile(strPicName.c_str(),HPR_READ,HPR_WREAD);
  if (hFile==HPR_INVALID_FILE)
  {
   CLIENT_ERROR("HPR_OpenFile %s faild ",strPicName.c_str());
   break;
  }
  if (HPR_ReadFile(hFile,buff,PICTURE_SIZE,&iLen)==HPR_ERROR||iLen==0)
  {
   CLIENT_ERROR("HPR_ReadFile %s faild len %d",strPicName.c_str(),iLen);
   break;
  }
  iReval=HPR_OK;
 } while (0);
 return iReval;
}