ObjectARX_符号表---->图层

LAYER命令：图层特性管理器：查看图层

锁定图层： layiso ；解锁图层：layuniso

建立图层记录：

void ZffCHAP4NewLayer()
{
// 提示用户输入新建图层的名称
char layerName[100];
if (acedGetString(Adesk::kFalse, "\n输入新图层的名称：",layerName) != RTNORM)
   return;

// 得到当前图形的层表
AcDbLayerTable *pLayerTbl = NULL;
acdbHostApplicationServices()->workingDatabase()->getLayerTable(pLayerTbl, AcDb::kForWrite);

// 是否已经包含指定的层表记录
if (pLayerTbl->has(layerName))
{
pLayerTbl->close();
return;
}

// 建立新的层表记录
AcDbLayerTableRecord *pLayerTblRcd = new AcDbLayerTableRecord();
pLayerTblRcd->setName(layerName);

// 设置颜色,层的其余属性（线型等）都用缺省值
AcCmColor color; 
color.setColorIndex(1); 
pLayerTblRcd->setColor(color); 

// 将新建的层表记录添加到层表中
AcDbObjectId layerTblRcdId;
pLayerTbl->add(layerTblRcdId, pLayerTblRcd);
acdbHostApplicationServices()->workingDatabase()->setClayer(layerTblRcdId);
pLayerTblRcd->close();
pLayerTbl->close();
}

修改指定图层的颜色

void ZffCHAP4LayerColor()
{
// 提示用户输入要修改的图层名称
char layerName[100];
if (acedGetString(Adesk::kFalse, "\n输入图层的名称：",layerName) != RTNORM)
  return;

// 得到当前图形的层表
AcDbLayerTable *pLayerTbl = NULL;
acdbHostApplicationServices()->workingDatabase()->getLayerTable(pLayerTbl, AcDb::kForRead);

// 判断是否包含指定名称的层表记录
if (!pLayerTbl->has(layerName))
{
pLayerTbl->close();
return;
}

// 得到指定层表记录的指针
AcDbLayerTableRecord *pLayerTblRcd = NULL;
pLayerTbl->getAt(layerName, pLayerTblRcd, AcDb::kForWrite);

// 弹出“颜色”对话框
AcCmColor oldColor = pLayerTblRcd->color();
int nCurColor = oldColor.colorIndex(); // 图层修改前的颜色
int nNewColor = oldColor.colorIndex();  // 用户选择的颜色
if (acedSetColorDialog(nNewColor, Adesk::kFalse, nCurColor))
{
AcCmColor color;
color.setColorIndex(nNewColor);
pLayerTblRcd->setColor(color);
} 
pLayerTblRcd->close();
pLayerTbl->close();
}

删除指定的图层

void ZffCHAP4DelLayer()
{
// 提示用户输入要修改的图层名称
char layerName[100];
if (acedGetString(Adesk::kFalse, "\n输入图层的名称：",layerName) != RTNORM)
return;

// 得到当前图形的层表
AcDbLayerTable *pLayerTbl = NULL;
acdbHostApplicationServices()->workingDatabase()->getLayerTable(pLayerTbl, AcDb::kForRead);

// 判断是否包含指定名称的层表记录
if (!pLayerTbl->has(layerName))
{
pLayerTbl->close();
return;
}

// 得到指定层表记录的指针
AcDbLayerTableRecord *pLayerTblRcd = NULL;
pLayerTbl->getAt(layerName, pLayerTblRcd, AcDb::kForWrite);
pLayerTblRcd->erase();  // 为其设置“删除”标记
pLayerTblRcd->close();
pLayerTbl->close();
}

全部图层及其特性导出到文本文件

void ZffCHAP4ExportLayer()
{
// 建立所要导出的文本文件
CStdioFile f;
CFileException e;
char *pFileName = "C:\\layers.txt";
if (!f.Open(pFileName, CFile::modeCreate | CFile::modeWrite, &e))
{
acutPrintf("\n建立导出文件失败！");
return;
}

// 得到层表指针
AcDbLayerTable *pLayerTbl = NULL;
acdbHostApplicationServices()->workingDatabase()->getLayerTable(pLayerTbl, AcDb::kForRead);

// 使用遍历器访问每一条层表记录
AcDbLayerTableIterator *pItr = NULL;
AcDbLayerTableRecord *pLayerTblRcd = NULL;
pLayerTbl->newIterator(pItr);
for (pItr->start(); !pItr->done(); pItr->step())
{
pItr->getRecord(pLayerTblRcd, AcDb::kForRead);

// 输出图层的信息
CString strLayerInfo; // 图层名称
char *layerName = NULL;
pLayerTblRcd->getName(layerName);
strLayerInfo = layerName;
free(layerName);

strLayerInfo += ",";  // 分隔符
CString strColor; // 图层颜色
AcCmColor color = pLayerTblRcd->color();
strColor.Format("%d", color.colorIndex());
strLayerInfo += strColor;

strLayerInfo += ",";
CString strLinetype; // 图层线型
AcDbLinetypeTableRecord *pLinetypeTblRcd = NULL;
acdbOpenObject(pLinetypeTblRcd,pLayerTblRcd->linetypeObjectId(),AcDb::kForRead);
char *linetypeName = NULL;
pLinetypeTblRcd->getName(linetypeName);
pLinetypeTblRcd->close();
strLinetype = linetypeName;
free(linetypeName);
strLayerInfo += strLinetype;

strLayerInfo += ",";
CString strLineWeight;  // 图层的线宽
AcDb::LineWeight lineWeight = pLayerTblRcd->lineWeight();
strLineWeight.Format("%d", lineWeight);
strLayerInfo += strLineWeight;

// 将图层特性写入到文件中
f.WriteString(strLayerInfo);
f.WriteString("\n");
pLayerTblRcd->close();
}
delete pItr;
pLayerTbl->close();
}

根据文本文件导入全部图层及其特性

//读取一行文本以后，须要根据分隔符（ “，” ）来解析出图层的名称、颜色、线型和线宽
BOOL GetFieldText(CString strLineText, CStringArray &fields)
{ 
if (strLineText.Find(",", 0) == -1) // 若是找不到英文逗号，函
数退出
{
return FALSE;
} 
int nLeftPos = 0, nRightPos = 0; // 查找分隔符的起始位置
while ((nRightPos = strLineText.Find(",", nRightPos)) != -1)
{
fields.Add(strLineText.Mid(nLeftPos, nRightPos - nLeftPos));
nLeftPos = nRightPos + 1;
nRightPos++; 
}
// 最后一个列的数据
fields.Add(strLineText.Mid(nLeftPos));
return TRUE;
}

void ZffCHAP4ImportLayer()
{
// 打开所要导入的文本文件
CStdioFile f;
CFileException e;
char *pFileName = "C:\\layers.txt";
if (!f.Open(pFileName, CFile::modeRead, &e))
{
acutPrintf("\n打开导入文件失败！");
return;
}

// 得到层表指针
AcDbLayerTable *pLayerTbl = NULL;
AcDbLayerTableRecord *pLayerTblRcd = NULL;
acdbHostApplicationServices()->workingDatabase()->getLayerTable(pLayerTbl, AcDb::kForWrite);

// 读取文件中的每一行数据
CString strLineText;  // 一行文字
while (f.ReadString(strLineText))
{
// 跳过空行
if (strLineText.IsEmpty())
   continue;

// 解析出图层名称、颜色、线型和线宽
CStringArray layerInfos;
if (!GetFieldText(strLineText, layerInfos))
   continue;

// 建立新的层表记录，或者打开存在的块表记录
AcDbLayerTableRecord *pLayerTblRcd = NULL;
AcDbObjectId layerTblRcdId;
if (pLayerTbl->has(layerInfos.GetAt(0)))
{
pLayerTbl->getAt(layerInfos.GetAt(0), layerTblRcdId);
}
else
{
pLayerTblRcd = new AcDbLayerTableRecord();
pLayerTblRcd->setName(layerInfos.GetAt(0));
pLayerTbl->add(layerTblRcdId, pLayerTblRcd);
pLayerTblRcd->close();
}
acdbOpenObject(pLayerTblRcd, layerTblRcdId,AcDb::kForWrite);

// 设置层表记录的颜色
AcCmColor color;
Adesk::UInt16 colorIndex = atoi(layerInfos.GetAt(1));
color.setColorIndex(colorIndex);
pLayerTblRcd->setColor(color);

// 设置线型
AcDbLinetypeTable *pLinetypeTbl = NULL;
AcDbObjectId linetypeId;
acdbHostApplicationServices()->workingDatabase()->getLinetypeTable(pLinetypeTbl,AcDb::kForRead);
if (pLinetypeTbl->has(layerInfos.GetAt(2)))
{
pLinetypeTbl->getAt(layerInfos.GetAt(2), linetypeId);
}
else
{
pLinetypeTbl->getAt("Continous", linetypeId);
}
pLayerTblRcd->setLinetypeObjectId(linetypeId);
pLinetypeTbl->close();

// 设置线宽
AcDb::LineWeight lineWeight =(AcDb::LineWeight)atol(layerInfos.GetAt(3)); 
pLayerTblRcd->setLineWeight(lineWeight);
pLayerTblRcd->close();
}
pLayerTbl->close();
}