Qt导出Excel的简单实现

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

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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