UE4笔记-系统对话框相关功能记录和使用方法(打开/保存文件对话框系统对话框等等...)

FString UCommonBPLibrary::OpenFileDialog()
{
    void* ParentWindowPtr = FSlateApplication::Get().GetActiveTopLevelWindow()->GetNativeWindow()->GetOSWindowHandle();
    IDesktopPlatform* DesktopPlatform = FDesktopPlatformModuleEx::Get();

    FJsonSerializableArray OutFileNames;

    if (DesktopPlatform)
    {

        EFileDialogFlags::Type SelectionFlag = EFileDialogFlags::None; 
        //A value of 0 represents single file selection while a value of 1 represents multiple file selection
        DesktopPlatform->OpenFileDialog( ParentWindowPtr, 
                                         TEXT( "选取一张图片" ), 
                                         TEXT( "/" ), 
                                         TEXT( "" ), 
                                         TEXT( "(Image Files)|*.BMP;*.JPG;*.PNG;*.JPEG;)" ), 
                                         SelectionFlag ,
                                         OutFileNames );

    }


    if (OutFileNames.Num() > 0)
    {
        return FString (OutFileNames[0]);
    }
    else 
    {
        return TEXT("");
    }  
}

TArray<FString> UCommonBPLibrary::OpenFileDialogMultiple()
{
    TArray<FString> ret_arr;

    void* ParentWindowPtr = FSlateApplication::Get().GetActiveTopLevelWindow()->GetNativeWindow()->GetOSWindowHandle();
    IDesktopPlatform* DesktopPlatform = FDesktopPlatformModuleEx::Get();

    FJsonSerializableArray OutFileNames;

    if (DesktopPlatform)
    {
        EFileDialogFlags::Type SelectionFlag = EFileDialogFlags::Multiple;
        //A value of 0 represents single file selection while a value of 1 represents multiple file selection
        DesktopPlatform->OpenFileDialog(ParentWindowPtr,
            TEXT("选取图片"),
            TEXT("/"),
            TEXT(""),
            TEXT("(Image Files)|*.BMP;*.JPG;*.PNG;*.JPEG;)"),
            SelectionFlag,
            OutFileNames);
    }

    for (int i = 0; i < OutFileNames.Num(); i++) 
    {
        ret_arr.Add(FString(OutFileNames[i]));
    }

    return ret_arr;
}