技术员日志

WP7导航小技巧

2012-05-18T09:49:26+08:00

要求是从主页导航到页面B，再从页面B导航到页面C，但我不希望用户导航回页面B，而是直接导航回主页。

方法是在页面B中重写OnNavigatedFrom方法

protected override void OnNavigatedFrom(System.Windows.Navigation.NavigationEventArgs e)
{
    base.OnNavigatedFrom(e);
    PhoneApplicationFrame myFrame = Application.Current.RootVisual as PhoneApplicationFrame;
    if (myFrame != null)
    {
        try
        {
            myFrame.RemoveBackEntry();
        }
        catch (InvalidOperationException ex)
        {
            MessageBox.Show(ex.Message);
        }
    }
}

转自：http://blog.csdn.net/tcjiaan/article/details/7285062

WP7 PC安装应用工具－XapDeploymentTool

2012-05-04T10:58:48+08:00

转载一个顶呱呱很好用的WP7 PC安装应用工具，感谢Shankp的出品。

WP7图片旋转处理

2012-05-03T19:09:46+08:00

前面从网上看来一个方法，效率比较低，今天把它改进了一下。

复制内容到剪贴板程序代码

public enum ROTATE_ANGLE
{
    ROTATE_90 = 1,
    ROTATE_180,
    ROTATE_270
}

public static WriteableBitmap GetRotatedWriteableBitmap(WriteableBitmap image, ROTATE_ANGLE angle)
{
    WriteableBitmap rImg = null;

    if (angle == ROTATE_ANGLE.ROTATE_90)
    {
        rImg = new WriteableBitmap(image.PixelHeight, image.PixelWidth);
        for (int hy = 0; hy < image.PixelHeight; hy++)
        {
            for (int wx = 0; wx < image.PixelWidth; wx++)
            {
                rImg.Pixels[rImg.PixelWidth * wx + (rImg.PixelWidth - 1 - hy)]
                    = image.Pixels[image.PixelWidth * hy + wx];
            }
        }
    }
    else if (angle == ROTATE_ANGLE.ROTATE_180)
    {
        rImg = new WriteableBitmap(image.PixelWidth, image.PixelHeight);
        for (int hy = 0; hy < image.PixelHeight; hy++)
        {
            for (int wx = 0; wx < image.PixelWidth; wx++)
            {
                rImg.Pixels[rImg.PixelWidth * (rImg.PixelHeight-1-hy) + (rImg.PixelWidth - 1 - wx)]
                    = image.Pixels[image.PixelWidth * hy + wx];
            }
        }
    }
    else if (angle == ROTATE_ANGLE.ROTATE_270)
    {
        rImg = new WriteableBitmap(image.PixelHeight, image.PixelWidth);
        for (int hy = 0; hy < image.PixelHeight; hy++)
        {
            for (int wx = 0; wx < image.PixelWidth; wx++)
            {
                rImg.Pixels[rImg.PixelWidth * (rImg.PixelHeight-1-wx) + hy]
                    = image.Pixels[image.PixelWidth * hy + wx];
            }
        }
    }

    return rImg;
}

原来的方法：
http://www.cnsos.net/article.asp?id=316

Symbian 数据库字段类型

2012-04-30T10:46:29+08:00

SQL type	Symbian column type (in the DBMS C++ API)	Python type	Supported
BIT	EDbColBit	int	yes
TINYINT	EDbColInt8	int	yes
UNSIGNED TINYINT	EDbColUint8	int	yes
SMALLINT	EDbColInt16	int	yes
UNSIGNED SMALLINT	EDbColUint16	int	yes
INTEGER	EDbColInt32	int	yes
UNSIGNED INTEGER	EDbColUint32	int	yes
COUNTER	EDbColUint32 (with theTDbCol::EAutoIncrementattribute)	int	yes
BIGINT	EDbColInt64	long	yes
REAL	EDbColReal32	float	yes
FLOAT	EDbColReal64	float	yes
DOUBLE	EDbColReal64	float	yes
DOUBLE PRECISION	EDbColReal64	float	yes
DATE	EDbColDateTime	float (or long, withcol_rawtime()	yes
TIME	EDbColDateTime	float (or long, withcol_rawtime()	yes
TIMESTAMP	EDbColDateTime	float (or long, withcol_rawtime()	yes
CHAR(n)	EDbColText	Unicode	yes
VARCHAR(n)	EDbColText	Unicode	yes
LONG VARCHAR	EDbColLongText	Unicode	yes
BINARY(n)	EDbColBinary	str	read only
VARBINARY(n)	EDbColBinary	str	read only
LONG VARBINARY	EDbColLongBinary	n/a	no

WP7代码执行的时间

2012-04-25T16:42:06+08:00

了解你的代码消耗的时间，这里的结果times的单位是毫秒。

复制内容到剪贴板程序代码

long startTime = DateTime.Now.Ticks;
//你的代码
long endTime = DateTime.Now.Ticks;
long times = (endTime - startTime)/10000;

WP7用HttpWebRequest下载文件

2012-04-19T15:23:40+08:00

复制内容到剪贴板程序代码

private string imageUrl = "http://www.baidu.com/img/baidu_sylogo1.gif";

private void button1_Click(object sender, RoutedEventArgs e)
{
    System.Uri uri = new Uri(imageUrl);
    HttpWebRequest httpRequest = WebRequest.Create(uri) as HttpWebRequest;
    httpRequest.BeginGetResponse(DownloadFileCallback, httpRequest);
}

private void DownloadFileCallback(IAsyncResult result)
{
    try
    {
        HttpWebRequest request = (HttpWebRequest)(result.AsyncState);
        HttpWebResponse response = request.EndGetResponse(result) as HttpWebResponse;
        Stream responseStream = response.GetResponseStream();
        BinaryReader streamReader = new BinaryReader(responseStream);
        IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication();
        IsolatedStorageFileStream fs = myIsolatedStorage.OpenFile(System.IO.Path.GetFileName(imageUrl),
                                                            FileMode.Create, FileAccess.ReadWrite);
        long downloadSize = 0;
        byte[] readBuffer = new byte[1024];
        int iReadBytes = 0;

        do
        {
            // 接收数据
            iReadBytes = streamReader.Read(readBuffer, 0, readBuffer.Length);

            if (iReadBytes > 0)
            {
                fs.Write(readBuffer, 0, iReadBytes);
                downloadSize += iReadBytes;
            }
        } while (downloadSize < response.ContentLength);
        fs.Flush();
        fs.Close();
    }
    catch (SystemException ex)
    {
        Debug.WriteLine(ex.Message);
    }
}

WP7判断两个字符串是否相同

2012-04-19T14:14:45+08:00

复制内容到剪贴板程序代码

if(string1.Equals(string2)  == true)
    //string1和string2相同
else
    //string1和string2不同

Symbian复制、移动、删除目录及子目录

2012-04-18T10:34:25+08:00

复制内容到剪贴板程序代码

TInt RmDir(TDes16& aDirName)
{
    TBuf<128> tDirName;
    tDirName.Copy(aDirName);
    if( tDirName.Right(1).Compare(_L("\\")) != 0 )
        tDirName.Append(_L("\\"));

    RFs fsSession;
    fsSession.Connect();
    CFileMan* fileManager = CFileMan::NewL(fsSession);
    TInt result = fileManager->RmDir(tDirName);
    delete fileManager;
    fsSession.Close();
    return result;
}

复制内容到剪贴板程序代码

TInt Copy(const TDesC &anOld, const TDesC &aNew)
{
    RFs fsSession;
    fsSession.Connect();
    CFileMan* fileManager = CFileMan::NewL(fsSession);
    TInt result = fileManager->Copy(anOld, aNew, CFileMan::ERecurse);
    delete fileManager;
    fsSession.Close();
    return result;
}

复制内容到剪贴板程序代码

TInt Move(const TDesC &anOld, const TDesC &aNew)
{
    RFs fsSession;
    fsSession.Connect();
    CFileMan* fileManager = CFileMan::NewL(fsSession);
    TInt result = fileManager->Move(anOld, aNew, CFileMan::ERecurse);
    delete fileManager;
    fsSession.Close();
    return result;
}

WP7定时器的使用

2012-04-16T09:56:04+08:00

复制内容到剪贴板程序代码

DispatcherTimer timer = new DispatcherTimer();
timer.Interval = TimeSpan.FromSeconds(1);
timer.Tick += timer_Tick;
timer.Start();

其中timer_Tick是定时器的回调函数

WP7读取并显示图片

2012-04-11T15:31:35+08:00

从应用资源读取图片并显示：

复制内容到剪贴板程序代码

StreamResourceInfo streamResourceInfo = Application.GetResourceStream(new Uri("TestImage.jpg", UriKind.Relative));
BitmapImage bmp = new BitmapImage();
bmp.SetSource(streamResourceInfo.Stream);
image1.Source = bmp;

从应用独立存储读取图片并显示：

复制内容到剪贴板程序代码

using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
{
    using (Stream imgStream = myIsolatedStorage.OpenFile("TestImage.jpg", FileMode.Open))
    {
        BitmapImage bmp = new BitmapImage();
        bmp.SetSource(imgStream);
        image1.Source = bmp;
    }
}