选择文件对话框

最新推荐文章于 2025-01-22 21:02:35 发布

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本文介绍如何在项目中使用C++实现自定义文件过滤器，以选择特定类型的图像文件，包括JPEG、PNG和GIF格式，并通过文件对话框进行交互。

经常在我们的项目中可能会用到选择文件对话框.
当然更会用到选择指定格式的文件

#include <maknfilefilter.h>

//定义一个属于自己的类,也就是文件过滤器
//代码演示了选择图像文件的对话框

class CMelodyFilter : public MAknFileFilter
{
   TBool Accept(const TDesC &aDriveAndPath, const TEntry &aEntry) const
   {
   if(aEntry.IsDir() || aEntry.iName.Right(4) == _L(".jpg") || aEntry.iName.Right(4) == _L(".png")
           || aEntry.iName.Right(4) == _L(".gif"))
       return ETrue;
   else
       return EFalse;
   }
};

//选择文件对话框
TBool CSaveImageAppUi::SelectFileL(TFileName& aFileName)
   {
   TFileName fileName;

    CAknMemorySelectionDialog* memSelectionDialog =
        CAknMemorySelectionDialog::NewL(ECFDDialogTypeSelect, EFalse);
    CAknMemorySelectionDialog::TMemory mem(CAknMemorySelectionDialog::EPhoneMemory);

    TInt ret = memSelectionDialog->ExecuteL(mem);
    CleanupStack::PopAndDestroy(memSelectionDialog);
    if (!ret)
        {
        return EFalse;
        }

    CAknFileSelectionDialog* fileSelectionDialog = NULL;
    if (mem == CAknMemorySelectionDialog::EMemoryCard)
        {
        fileSelectionDialog = CAknFileSelectionDialog::NewL(
                ECFDDialogTypeSelect, R_FILE_SELECTION_DIALOG_E);
        }
    else
        {
        fileSelectionDialog= CAknFileSelectionDialog::NewL(
                ECFDDialogTypeSelect, R_FILE_SELECTION_DIALOG_C);
        }

    CMelodyFilter* filter = new(ELeave) CMelodyFilter;

    fileSelectionDialog->SetDefaultFolderL(_L("Image\\"));
    fileSelectionDialog->AddFilterL(filter);
    TBool err = fileSelectionDialog->ExecuteL(fileName);
    aFileName.Copy(fileName);
    delete fileSelectionDialog;

    return err;
    }

//资源文件
#include <commondialogs.hrh> //FILESELECTIONDIALOG
#include <commondialogs.rh>

RESOURCE FILESELECTIONDIALOG r_file_selection_dialog_c
{
title = <0x9009><0x62e9><0x6587><0x4EF6>;
root_path = "C:\\";
}

RESOURCE FILESELECTIONDIALOG r_file_selection_dialog_e
{
title = <0x9009><0x62e9><0x6587><0x4EF6>;
root_path = "E:\\";
}