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问题描述：
在绘图时，经常要用到一些重复使用的块。我把这些经常要用到的图例做成了块，单独放在一个BlockLib.dwg文件中。想做一个类似于自带的insert对话框类似的应用程序，但是是从外部文件中打开块，并插入。我写了一下程序，但是不能预览块图标。请各位大侠帮忙看看，是哪里问题？
（PS：如果图块已经在文件中了，那是可以成功预览的。）
我的方法：
//新建一个临时的数据库，打开外部文件
AcDbDatabase *pExDb= new AcDbDatabase(Adesk::kFalse);
Acad::ErrorStatus es = pExDb->readDwgFile(_T("C:\\BlockLib.dwg"));
//利用块表迭代器查找块表记录
AcDbBlockTableIterator *pItr;
pBlockTable->newIterator (pItr);
pItr->getRecord(pRecord,AcDb::kForRead);
//利用wblock函数和inser函数添加块定义
AcDbDatabase* pOutputDb;
pExDb->wblock(pOutputDb,BlkRecordID);
AcDbObjectId blockId;
acdbHostApplicationServices()->workingDatabase()->insert
(blockId,pBlckName,pOutputDb);
代码（贴出对话框资源类class BlockViewdlg的代码)
//-----------------------------------------------------------------------------
//----- BlockViewdlg.h : Declaration of the BlockViewdlg
//-----------------------------------------------------------------------------
#pragma once
//-----------------------------------------------------------------------------
#include "acui.h"
#include "resource.h"
//-----------------------------------------------------------------------------
class BlockViewdlg : public CAcUiDialog {
DECLARE_DYNAMIC (BlockViewdlg)
public:
BlockViewdlg (CWnd *pParent =NULL, HINSTANCE hInstance =NULL) ;
enum { IDD = IDD_DIA_VIEWER} ;
protected:
virtual void DoDataExchange (CDataExchange *pDX) ;
afx_msg LRESULT OnAcadKeepFocus (WPARAM, LPARAM) ;
DECLARE_MESSAGE_MAP()
public:
CStatic m_bmofBlkref;
CAcUiPickButton m_close;
CAcUiPickButton m_butinsert;
CListBox m_listofblkID;
virtual BOOL OnInitDialog();
afx_msg void OnLbnSelchangeListBlockid();
afx_msg void OnBnClickedButtonInsert();
afx_msg void OnBnClickedButtonClose();
afx_msg void OnClose();
public:
CString m_strBlockID;
protected:
/*HBITMAP BlockIconToBMP(const AcDbObjectId& BlkID,HDC hdc,CString selRcdName);*/
HBITMAP BlockIconToBMP(const AcDbObjectId& BlkID, HDC hdc);
public:
AcArray m_preIcon;
} ;
//-----------------------------------------------------------------------------
//----- BlockViewdlg.cpp : Implementation of BlockViewdlg
//-----------------------------------------------------------------------------
#include "StdAfx.h"
#include "BlockViewdlg.h"
#include "dbsymtb.h"
#include "acutmem.h"
#include "resource.h"
//-----------------------------------------------------------------------------
IMPLEMENT_DYNAMIC (BlockViewdlg, CAcUiDialog)
BEGIN_MESSAGE_MAP(BlockViewdlg, CAcUiDialog)
ON_MESSAGE(WM_ACAD_KEEPFOCUS, OnAcadKeepFocus)
ON_LBN_SELCHANGE(IDC_LIST_BLOCKID, &BlockViewdlg::OnLbnSelchangeListBlockid)
ON_BN_CLICKED(IDC_BUTTON_INSERT, &BlockViewdlg::OnBnClickedButtonInsert)
ON_BN_CLICKED(IDC_BUTTON_CLOSE, &BlockViewdlg::OnBnClickedButtonClose)
ON_WM_CLOSE()
END_MESSAGE_MAP()
//-----------------------------------------------------------------------------
BlockViewdlg::BlockViewdlg (CWnd *pParent /*=NULL*/, HINSTANCE hInstance /*=NULL*/) : CAcUiDialog (BlockViewdlg::IDD, pParent, hInstance) {
}
//-----------------------------------------------------------------------------
void BlockViewdlg::DoDataExchange (CDataExchange *pDX) {
CAcUiDialog::DoDataExchange (pDX) ;
DDX_Control(pDX, IDC_BITMAP_VIEWER, m_bmofBlkref);
DDX_Control(pDX, IDC_BUTTON_CLOSE, m_close);
DDX_Control(pDX, IDC_BUTTON_INSERT, m_butinsert);
DDX_Control(pDX, IDC_LIST_BLOCKID, m_listofblkID);
}
//-----------------------------------------------------------------------------
//----- Needed for modeless dialogs to keep focus.
//----- Return FALSE to not keep the focus, return TRUE to keep the focus
LRESULT BlockViewdlg::OnAcadKeepFocus (WPARAM, LPARAM) {
return (TRUE) ;
}
BOOL BlockViewdlg::OnInitDialog()
{
CAcUiDialog::OnInitDialog();
// TODO: 在此添加额外的初始化;
/*AcDbDatabase extDatabase(Adesk::kFalse);
AcDbDatabase *pExDb= new AcDbDatabase(Adesk::kFalse);//0,false is OK.
//需要增加文件已经打开的异常处理;
Acad::ErrorStatus es = pExDb->readDwgFile(_T("C:\\BlockLib.dwg"));
if (es !=Acad::eOk)
{
delete pExDb;
MessageBox(_T("找不到块图库！"), _T("ERROR"), MB_OK);
this->SendMessage(WM_CLOSE);
return FALSE;
}
//else
//{
// //添加查找文件的程序;2014-7-12
//}
AcDbBlockTable *pBlockTable;
AcDbBlockTableRecord *pRecord;
pExDb->getBlockTable(pBlockTable,AcDb::kForRead);
AcDbBlockTableIterator *pItr;
pBlockTable->newIterator (pItr);
for (pItr->start();!pItr->done();pItr->step())
{
pItr->getRecord(pRecord,AcDb::kForRead);
ACHAR* pBlckName;
pRecord->getName(pBlckName);
CString strName(pBlckName);
if (strName.Compare(ACDB_MODEL_SPACE)!=0&&
strName.Compare(ACDB_PAPER_SPACE)!=0&&
strName.Compare(_T("*Paper_Space0"))!=0)
{
/*acedCommand(RTSTR,"BLOCKICON",RTSTR,pBlckName,RTNONE);*/
m_listofblkID.AddString(strName);
AcDbObjectId BlkRecordID;
pBlockTable->getAt(pBlckName,BlkRecordID);
AcDbDatabase* pOutputDb;
pExDb->wblock(pOutputDb,BlkRecordID);
AcDbObjectId blockId;
acdbHostApplicationServices()->workingDatabase()->insert
(blockId,pBlckName,pOutputDb);
AcDbBlockTableRecord *pBlkTblRcd=NULL;
//AcArray icon; //UInt8:8位无符号整数;
/*PreviewIcon icon;*/
Acad::ErrorStatus es = acdbOpenObject(pBlkTblRcd,blockId,AcDb::kForRead);
if (acedCommand(RTSTR,"_BLOCKICON",RTSTR,strName,0)!=RTNORM)
{
AfxMessageBox(_T("无法打开！"));
/*::SendMessage(WM_CLOSE);*/
return FALSE;
}
if(!pBlkTblRcd->hasPreviewIcon())
{
/*acedCommand(RTSTR,"BLOCKICON",RTSTR,selRcdName,RTNONE);*/
pBlkTblRcd->close();
return FALSE;
}
}
acutDelString(pBlckName);
pRecord->close();
}
delete pItr;
pBlockTable->close();
delete pExDb;
return TRUE; // return TRUE unless you set the focus to a control
// 异常: OCX 属性页应返回 FALSE
}
void BlockViewdlg::OnLbnSelchangeListBlockid()
{
// TODO: 在此添加控件通知处理程序代码
// 图形预览;
CPaintDC dc(this);
int icursel = m_listofblkID.GetCurSel();
m_listofblkID.GetText(icursel,m_strBlockID);
AcDbBlockTable *pBlockTable;
acdbHostApplicationServices()->workingDatabase()
->getBlockTable(pBlockTable,AcDb::kForRead);
AcDbObjectId blkId;
pBlockTable->getAt(m_strBlockID,blkId);
HBITMAP hBitmap=BlockIconToBMP(blkId,dc.GetSafeHdc());
/*AcDbBlockTableRecord *pBlkRec;
pBlockTable->getAt(m_strBlockID,pBlkRec);
HBITMAP hBitmap=BlockIconToBMP(pBlkRec,dc.GetSafeHdc()); */
m_bmofBlkref.SetBitmap(hBitmap);
pBlockTable->close();
}
void BlockViewdlg::OnBnClickedButtonInsert()
{
// TODO: 在此添加控件通知处理程序代码
}
void BlockViewdlg::OnBnClickedButtonClose()
{
// TODO: 在此添加控件通知处理程序代码
}
void BlockViewdlg::OnClose()
{
// TODO: 在此添加消息处理程序代码和/或调用默认值;
CAcUiDialog::OnClose();
}
//获得指定的块表记录的预览图像，输入参数：块表记录的ID，设备描述表句柄;
//HBITMAP BlockIconToBMP(const AcDbObjectId& BlkID,HDC hdc,CString selRcdName)
//{
// AcDbBlockTableRecord *pBlkTblRcd=NULL;
// AcArray icon;
// Acad::ErrorStatus es = acdbOpenObject(pBlkTblRcd,BlkID,AcDb::kForRead);
// if (Acad::eOk != es)
// {
// AfxMessageBox(_T("无法打开！"));
// /*::SendMessage(WM_CLOSE);*/
// return FALSE;
// }
// if(!pBlkTblRcd->hasPreviewIcon())
// {
// acedCommand(RTSTR,"BLOCKICON",RTSTR,selRcdName,0);
// }
// pBlkTblRcd->getPreviewIcon(icon);
// pBlkTblRcd->close();
// BITMAPINFOHEADER * ih = (BITMAPINFOHEADER*)(icon.asArrayPtr()); //位图信息头;
// /*memcpy(&ih,icon.asArrayPtr(),sizeof(ih));*/
// size_t memsize=sizeof(BITMAPINFOHEADER)+((1 icon; //UInt8:8位无符号整数;
/*PreviewIcon icon;*/
Acad::ErrorStatus es = acdbOpenObject(pBlkTblRcd,BlkID,AcDb::kForRead);
if (Acad::eOk != es)
{
AfxMessageBox(_T("无法打开！"));
/*::SendMessage(WM_CLOSE);*/
return FALSE;
}
if(!pBlkTblRcd->hasPreviewIcon())
{
/*acedCommand(RTSTR,"BLOCKICON",RTSTR,selRcdName,RTNONE);*/
pBlkTblRcd->close();
return FALSE;
}
es = pBlkTblRcd->getPreviewIcon(icon);
if (Acad::eOk != es)
{
AfxMessageBox(_T("无法打开！"));
/*::SendMessage(WM_CLOSE);*/
return FALSE;
}
pBlkTblRcd->close();
BITMAPINFOHEADER ih ; //位图信息头;
memcpy(&ih,icon.asArrayPtr(),sizeof(ih));
size_t memsize=sizeof(BITMAPINFOHEADER)+((1
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