New App and Utility

Dotted circle can be used for showing circular progress. Here is the code to draw a dotted/dashed circle using C# in windows form application: using System ; using System.Collections.Generic ; using System.ComponentModel ; using System.Data ; using System.Drawing ; using System.Linq ; using System.Text ; using System.Windows.Forms ; using System.Drawing.Drawing2D ; using System.Threading ; namespace WindowsFormsApplication1 { public partial class Form1 : Form { public Form1 () { InitializeComponent(); } int angle = 0 ; int Startangle = 0 ; private void Form1_Load ( object sender, EventArgs e) { } private void panel1_Paint ( object sender, PaintEventArgs e) { //draw a dashed cricle using(Graphics g = panel1.CreateGraphics()) { System.Drawing.Rectangle rectangle = new System.Drawi...

In windows form combo box control sometimes while adidng items dynamically we have items whose width is greater than width of combox box control. In this case for making UI more user friendly we can show tooltip over such item. Here is the sample C# code to display such tooltip:  Add a Tooltip control on the form.  Add following code : this . combo_box1 . DropDownStyle = System . Windows . Forms . ComboBoxStyle . DropDownList; this . combo_box1 . DrawMode = DrawMode . OwnerDrawFixed; this . combo_box1 . DrawItem += new DrawItemEventHandler(combo_box1_DrawItem); this . combo_box1 . DropDownClosed += new EventHandler(combo_box1_DropDownClosed); this . combo_box1 . MouseLeave += new EventHandler(combo_box1_Leave); void combo_box1_DrawItem( object sender, DrawItemEventArgs e) { if (e . Index < 0 ) { return ; } string text = combo_box1 . GetItemText(combo_box1 . Items[...

Code to Resize Image (with Sample Application) In this post I am sharing the code to resize an image using C#.NET. Also sharing the code to preview and save resized image in multiple formats (jpeg, bmp, png, gif, tiff). Code to Resize Image for given width and height public static Bitmap ResizeImage(Image image, int width, int height) { var destRect = new Rectangle(0, 0, width, height); var destImage = new Bitmap(width, height); destImage.SetResolution(image.HorizontalResolution, image.VerticalResolution); using ( var graphics = Graphics.FromImage(destImage)) { graphics.CompositingMode = CompositingMode.SourceCopy; graphics.CompositingQuality = CompositingQuality.HighQuality; graphics.InterpolationMode = InterpolationMode.HighQualityBicubic; graphics.SmoothingMode = SmoothingMode.HighQuality; ...

Sometimes in case of Windows form application where we have multiple windows opened and we need to find on which window user has clicked. One method to find this is to capture the mouse click message.  Here is the sample code to close form if mouse click happen outside the form.    public   partial   class   frmTest  :   Form     {           class   Window CaptureChanged   :   NativeWindow         {               public   CaptureChanged   OnCaptureChanged ;               protected   override   void   WndProc ( ref   Message   m )             {             ...

Sometimes due to design requirement we need to create a border less form or a custom border around the form.  In case of default border the movement of form on mouse down is handled internally we do not need to write any code for this. But if we create a custom border or a border-less form then in that case we need to write a custom code to handle form movement using mouse. Here is the C# code to handle form movement on mouse down.  using System.Runtime.InteropServices; const int HT_CAPTION = 0x2; const int WM_NCLBUTTONDOWN = 0xA1; [DllImportAttribute("user32.dll")] public static extern int SendMessage(IntPtr hWnd,int Msg, int wParam, int lParam); [DllImportAttribute("user32.dll")] public static extern bool ReleaseCapture(); private void Form1_MouseDown(object sender, MouseEventArgs e) {   if (e.Button == MouseButtons.Left)   {     ReleaseCapture();     SendMessage(Handle, WM_NCLBUTTONDO...

Sometimes the photos captured from cameras are saved in a raw format. The RAW files are not ready for editing with any bitmap editor. By default GDI+ in windows application do not support RAW file formats. So while reading a RAW image file in .NET we can get exceptions like "Out of memory". Here we will discuss method to read RAW image file in C# application. Using DCRaw dcraw is an open-source computer program which is able to read numerous raw image formats, typically produced by high-end digital cameras. dcraw converts these images into the standard PPM and TIFF image formats. Here is the sample in C# to extarct image from RAW file using DCRaw executable string PathToDcRawExecutable = "C:\\DcRaw\\dcraw-ms.exe"; var _sourceImage = (Bitmap)Image.FromStream(GetImageFromRaw("c:\\testimage.ORF", PathToDcRawExecutable)); public Stream GetImageFromRaw(string inputFile, string dcRawExe) {     var startInfo = new ProcessStartInfo(dcRawExe)     { ...

Any CPU Type configuration in .NET project using C++ DLL Sometimes application is memory hungry like application for image processing etc. In this case we need a 64-bit OS where application can use higher amount of memory. Also we want that our application should remain compatible with 32-bit OS. To satisfy both these condition with single exe we can use Any CPU configuration to build our project. Here are the steps to set Any CPU configuration open in Visual Studio - 1. Go to Build -> Configuration Manager 2. From Active solution platform click <New...> 3. From New Solution Platform select Any CPU 4. Click OK Build the project. The exe created will be compatible on both OS (64-bit and 32-bit). In case if we have a C++ dll used by the code and loaded at run-time as interop service. Since C++ project do not have Any CPU configuration, so in this case we build this C++ DLL in both configuration (64-bit and 32-bit) and then load DLL according to the type of system...

Pass byte array from C# to C++                           If you want to pass a byte array to native DLL as parameter, you can use the Intptr to do this, please check the demo below. /C++ API code: TestDLL_API void TestArrayPara (BYTE * pArray, int nSize) { for ( int i= 0 ; i<nSize; i++) printf( "%d\n" , pArray[i]); } //C# code: class TestClass { [DllImport(@"TestDll.dll")] public static extern void TestArrayPara (IntPtr pArray, int nSize); public static void Test () { byte [] array = new byte [ 16 ]; for ( int i = 0 ; i < 16 ; i++) { array[i] = ( byte )(i + 97 ); } int size = Marshal.SizeOf(array[ 0 ]) * array.Length; IntPtr pnt = Marshal.AllocHGlobal(size); try { // Copy the array to unmanaged memory. ...

Flip Image Using the Image.RotateFlip method, we can rotate the image by 90/180/270-degrees or flip the image horizontally or vertically. The parameter of RotateFlip is System.Drawing.RotateFlipType, which specifies the type of rotation and flip to apply to the image. Code Snippet: //Specifies a 180-degree rotation without flipping pictureBox1.Image.RotateFlip(RotateFlipType.Rotate180FlipNone); //Specifies no rotation followed by a horizontal flip pictureBox1.Image.RotateFlip(RotateFlipType.RotateNoneFlipX); //Specifies a 90-degree rotation followed by a horizontal and vertical flip pictureBox1.Image.RotateFlip(RotateFlipType.Rotate90FlipXY); Join Two Images Bitmap bitmap = new Bitmap(image1.Width + image2.Width, Math.Max(image1.Height, image2.Height));     using (Graphics g = Graphics.FromImage(bitmap))     {         g.DrawImage(image1, 0, 0);         g.DrawImage(image2, ...