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Fix VS_Snippets_Winforms Application #524

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Merged
merged 3 commits into from
Dec 18, 2018
Merged

Fix VS_Snippets_Winforms Application #524

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6ce345b
Format the code
lindexi Dec 18, 2018
7bc4f0e
Change the fields.
lindexi Dec 18, 2018
21ef140
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lindexi Dec 18, 2018
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185 changes: 108 additions & 77 deletions snippets/csharp/VS_Snippets_Winforms/Application/CS/source.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,48 +9,57 @@
namespace MyApplication
{
// A simple form that represents a window in our application
public class AppForm2 : System.Windows.Forms.Form {
public AppForm2(){
this.Size = new System.Drawing.Size(300,300);
public class AppForm2 : System.Windows.Forms.Form
{
public AppForm2()
{
this.Size = new System.Drawing.Size(300, 300);
this.Text = "AppForm2";
}
}

// A simple form that represents a window in our application
public class AppForm1 : System.Windows.Forms.Form {
public AppForm1(){
this.Size = new System.Drawing.Size(300,300);
public class AppForm1 : System.Windows.Forms.Form
{
public AppForm1()
{
this.Size = new System.Drawing.Size(300, 300);
this.Text = "AppForm1";
}
}

//<Snippet2>
// The class that handles the creation of the application windows
class MyApplicationContext : ApplicationContext {

private int formCount;
private AppForm1 form1;
private AppForm2 form2;
class MyApplicationContext : ApplicationContext
{

private Rectangle form1Position;
private Rectangle form2Position;
private int _formCount;
private AppForm1 _form1;
private AppForm2 _form2;

private FileStream userData;
private Rectangle _form1Position;
private Rectangle _form2Position;

private FileStream _userData;

//<Snippet5>
private MyApplicationContext() {
formCount = 0;
private MyApplicationContext()
{
_formCount = 0;

// Handle the ApplicationExit event to know when the application is exiting.
Application.ApplicationExit += new EventHandler(this.OnApplicationExit);

try {
try
{
// Create a file that the application will store user specific data in.
userData = new FileStream(Application.UserAppDataPath + "\\appdata.txt", FileMode.OpenOrCreate);
_userData = new FileStream(Application.UserAppDataPath + "\\appdata.txt", FileMode.OpenOrCreate);

} catch(IOException e) {
}
catch (IOException e)
{
// Inform the user that an error occurred.
MessageBox.Show("An error occurred while attempting to show the application." +
MessageBox.Show("An error occurred while attempting to show the application." +
"The error is:" + e.ToString());

// Exit the current thread instead of showing the windows.
Expand All @@ -59,142 +68,164 @@ private MyApplicationContext() {

// Create both application forms and handle the Closed event
// to know when both forms are closed.
form1 = new AppForm1();
form1.Closed += new EventHandler(OnFormClosed);
form1.Closing += new CancelEventHandler(OnFormClosing);
formCount++;
_form1 = new AppForm1();
_form1.Closed += new EventHandler(OnFormClosed);
_form1.Closing += new CancelEventHandler(OnFormClosing);
_formCount++;

form2 = new AppForm2();
form2.Closed += new EventHandler(OnFormClosed);
form2.Closing += new CancelEventHandler(OnFormClosing);
formCount++;
_form2 = new AppForm2();
_form2.Closed += new EventHandler(OnFormClosed);
_form2.Closing += new CancelEventHandler(OnFormClosing);
_formCount++;

// Get the form positions based upon the user specific data.
if (ReadFormDataFromFile()) {
if (ReadFormDataFromFile())
{
// If the data was read from the file, set the form
// positions manually.
form1.StartPosition = FormStartPosition.Manual;
form2.StartPosition = FormStartPosition.Manual;
form1.Bounds = form1Position;
form2.Bounds = form2Position;
_form1.StartPosition = FormStartPosition.Manual;
_form2.StartPosition = FormStartPosition.Manual;

_form1.Bounds = _form1Position;
_form2.Bounds = _form2Position;
}

// Show both forms.
form1.Show();
form2.Show();
_form1.Show();
_form2.Show();
}

private void OnApplicationExit(object sender, EventArgs e) {
private void OnApplicationExit(object sender, EventArgs e)
{
// When the application is exiting, write the application data to the
// user file and close it.
WriteFormDataToFile();

try {
try
{
// Ignore any errors that might occur while closing the file handle.
userData.Close();
} catch {}
_userData.Close();
}
catch { }
}
//</Snippet5>

private void OnFormClosing(object sender, CancelEventArgs e) {
private void OnFormClosing(object sender, CancelEventArgs e)
{
// When a form is closing, remember the form position so it
// can be saved in the user data file.
if (sender is AppForm1)
form1Position = ((Form)sender).Bounds;
if (sender is AppForm1)
_form1Position = ((Form)sender).Bounds;
else if (sender is AppForm2)
form2Position = ((Form)sender).Bounds;
_form2Position = ((Form)sender).Bounds;
}

//<Snippet3>
private void OnFormClosed(object sender, EventArgs e) {
private void OnFormClosed(object sender, EventArgs e)
{
// When a form is closed, decrement the count of open forms.

// When the count gets to 0, exit the app by calling
// ExitThread().
formCount--;
if (formCount == 0) {
_formCount--;
if (_formCount == 0)
{
ExitThread();
}
}
//</Snippet3>

private bool WriteFormDataToFile(){
private bool WriteFormDataToFile()
{
// Write the form positions to the file.
UTF8Encoding encoding = new UTF8Encoding();

RectangleConverter rectConv = new RectangleConverter();
String form1pos = rectConv.ConvertToString(form1Position);
String form2pos = rectConv.ConvertToString(form2Position);
string form1pos = rectConv.ConvertToString(_form1Position);
string form2pos = rectConv.ConvertToString(_form2Position);

byte[] dataToWrite = encoding.GetBytes("~" + form1pos + "~" + form2pos);

try {
try
{
// Set the write position to the start of the file and write
userData.Seek(0,SeekOrigin.Begin);
userData.Write(dataToWrite, 0, dataToWrite.Length);
userData.Flush();
_userData.Seek(0, SeekOrigin.Begin);
_userData.Write(dataToWrite, 0, dataToWrite.Length);
_userData.Flush();

userData.SetLength(dataToWrite.Length);
_userData.SetLength(dataToWrite.Length);
return true;

} catch {
}
catch
{
// An error occurred while attempting to write, return false.
return false;
}

}

private bool ReadFormDataFromFile(){
private bool ReadFormDataFromFile()
{
// Read the form positions from the file.
UTF8Encoding encoding = new UTF8Encoding();
String data;
string data;

if (userData.Length != 0) {
byte[] dataToRead = new Byte[userData.Length];
if (_userData.Length != 0)
{
byte[] dataToRead = new byte[_userData.Length];

try {
try
{
// Set the read position to the start of the file and read.
userData.Seek(0, SeekOrigin.Begin);
userData.Read(dataToRead, 0, dataToRead.Length);
_userData.Seek(0, SeekOrigin.Begin);
_userData.Read(dataToRead, 0, dataToRead.Length);

} catch (IOException e) {
String errorInfo = e.ToString();
}
catch (IOException e)
{
string errorInfo = e.ToString();
// An error occurred while attempt to read, return false.
return false;
}

// Parse out the data to get the window rectangles
data = encoding.GetString(dataToRead);

try {
try
{
// Convert the string data to rectangles
RectangleConverter rectConv = new RectangleConverter();
String form1pos = data.Substring(1,data.IndexOf("~",1)-1);
string form1pos = data.Substring(1, data.IndexOf("~", 1) - 1);

form1Position = (Rectangle)rectConv.ConvertFromString(form1pos);
_form1Position = (Rectangle)rectConv.ConvertFromString(form1pos);

String form2pos = data.Substring(data.IndexOf("~",1)+1);
form2Position = (Rectangle)rectConv.ConvertFromString(form2pos);
string form2pos = data.Substring(data.IndexOf("~", 1) + 1);
_form2Position = (Rectangle)rectConv.ConvertFromString(form2pos);

return true;

} catch {
}
catch
{
// Error occurred while attempting to convert the rectangle data.
// Return false to use default values.
return false;
}

} else {
}
else
{
// No data in the file, return false to use default values.
return false;
}
}
}

//<Snippet4>
[STAThread]
static void Main(string[] args) {

static void Main(string[] args)
{

// Create the MyApplicationContext, that derives from ApplicationContext,
// that manages when the application should exit.

Expand All @@ -209,4 +240,4 @@ static void Main(string[] args) {
}
//</Snippet2>
}
//</Snippet1>
//</Snippet1>