Qt导出Excel的简单实现

转自于:http://blog.csdn.net/lazydreamhunter/article/details/8571021

   QAxObject对COM对象进行了封装,QAxObject派生自QAxBase,而后者提供了一组API通过IUnknown(不清楚IUnknown的同学可以去看看COM对象模型)指针直接访问COM对象,我们这里讲的excel也是一个COM对象,因此我们可以通过QAxObject来操作它,为了便于理解,我们首先了解一下excel的对象的主要层次结构:

                                                  Qt导出Excel的简单实现_第1张图片


    上图是excel对象的层次结构,1个excel就有1个Application对象,1个Application对象由多个Workbook对象组成,这些Workbook对象由Workbooks对象统一管理,Workbook对象下可以包含若干个Worksheet,这些Worksheet对象也有一个WorkSheets对象来统一管理,接下来是Range对象,这个对象就对应Worksheet里的表格单元了,好了大家应该清楚了Excel的对象的主要层次结构了吧,下面我们来看看QAxObject是怎么来导出excel的:

1.新建一个excel

QAxObject *pApplication = NULL;
QAxObject *pWorkBooks = NULL;
QAxObject *pWorkBook = NULL;
QAxObject *pSheets = NULL;
QAxObject *pSheet = NULL;
void newExcel(const QString &fileName)
{
 pApplication = new QAxObject();
 pApplication->setControl("Excel.Application");//连接Excel控件
 pApplication->dynamicCall("SetVisible(bool)", false);//false不显示窗体
 pApplication->setProperty("DisplayAlerts", false);//不显示任何警告信息。
 pWorkBooks = pApplication->querySubObject("Workbooks");
 QFile file(fileName);
 if (file.exists())
 {
 pWorkBook = pWorkBooks->querySubObject("Open(const QString &)", fileName);
 }
 else
 {
 pWorkBooks->dynamicCall("Add");
 pWorkBook = pApplication->querySubObject("ActiveWorkBook");
 }
 pSheets = pWorkBook->querySubObject("Sheets");
 pSheet = pSheets->querySubObject("Item(int)", 1);
}

2.增加1个Worksheet

void appendSheet(const QString &sheetName)
{
 QAxObject *pLastSheet = pSheets->querySubObject("Item(int)", cnt);
 pSheets->querySubObject("Add(QVariant)", pLastSheet->asVariant());
 pSheet = pSheets->querySubObject("Item(int)", cnt);
 pLastSheet->dynamicCall("Move(QVariant)", pSheet->asVariant());
 pSheet->setProperty("Name", sheetName);
}

3.向Excel单元格中写入数据

void setCellValue(int row, int column, const QString &value)
{
 QAxObject *pRange = pSheet->querySubObject("Cells(int,int)", row, column);
 range->dynamicCall("Value", value);
}

4.保存Excel

void saveExcel(constQString &fileName)

{
 pWorkBook->dynamicCall("SaveAs(const QString &)",
 QDir::toNativeSeparators(fileName));
}

5.释放Excel

void  freeExcel()

{
 if (pApplication != NULL)
 {
 pApplication->dynamicCall("Quit()");
 delete pApplication;
 pApplication = NULL;
 }
}


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