Programmer Point

Getting Properties of an Image

Language: VC++.NET

Author: Aamir Mustafa

Introduction:

This simple article will show how to get image properties. In this article I will load a photo and then its property will be shown. it will display all the properties of an image like name, image type, image size, its resolution.

How to show property:

Create an empty project and add following controls on the form.

Control	Properties
Form	Name=Form1 Text= Properties Width=554 Height=224
Button	Name= btnLoad Text= Load Photo
ListView	Name= lstProperties Width=329 Height=149 Scrollable=False Font Style=Bold Font Size=8 ForeColor=Coral
PictureBox	Name= pic Width=117 Height=149 BorderStyle=FixedSingle SizeMode=StretchImage

After doing that go to view code and add following code below in public area of class Form1.

public:

Bitmap ^bitmapImage;

String ^imageFile;

After that add following just below the above code

Here we are initializing the List View so when first our program runs so we can see two columns, one for Property and second for Property value. Both columns will be added when we first launch our program. Both columns have equal width. Type of View will be detail so we can show properties in detail like a table and we will set Grid Lines to true so that we can show grid lines. We will write following code in Form1 constructor.

Form1(void)

{

InitializeComponent();

lstProperties->View=View::Details;

lstProperties->Columns->Add("Property",Convert::ToInt32(lstProperties->Width*50/100));

lstProperties->Columns->Add("Value",Convert::ToInt32(lstProperties->Width*50/100));

lstProperties->GridLines=true;

}

Now write a function called GetProperties which gets the properties of an image and shows them in list view.

private:

void GetProperties()

{

lstProperties->Items->Clear();

lstProperties->Items->Add(gcnew ListViewItem(gcnew array { "Name", System::IO::Path::GetFileNameWithoutExtension(imageFile) }));

lstProperties->Items->Add(gcnew ListViewItem(gcnew array {"Width",bitmapImage->Width.ToString()+" Pixels"}));

lstProperties->Items->Add(gcnew ListViewItem(gcnew array {"Height",bitmapImage->Height.ToString()+" Pixels"}));

lstProperties->Items->Add(gcnew ListViewItem(gcnew array {"Vertical Resolution",bitmapImage->VerticalResolution.ToString()+" Pixels/Inch"}));

lstProperties->Items->Add(gcnew ListViewItem(gcnew array {"Horizontal Resolution",bitmapImage->HorizontalResolution.ToString()+" Pixels/Inch"}));

lstProperties->Items->Add(gcnew ListViewItem(gcnew array {"Pixel Format",bitmapImage->PixelFormat.ToString()}));

lstProperties->Items->Add(gcnew ListViewItem(gcnew array {"Pallete Flags",bitmapImage->Palette->Flags.ToString()}));

}

After that add following code to the load button’s click event. This opens a dialog to load picture from the local disk.

private: System::Void btnLoad_Click(System::Object^ sender, System::EventArgs^ e)

{

FileDialog ^fileDialog = gcnew OpenFileDialog();

fileDialog->Filter = "JPG (*.jpg)|*.jpg| Bitmap (*.bmp)|*.bmp|GIF (*.gif)|*.gif|JPEG (*.jpeg)|*.jpeg|PNG (*.png)|*.png|TIFF (*.tif)|*.tif|All Files (*.*)|*.*";

fileDialog->ShowDialog(this);

pic->SizeMode = PictureBoxSizeMode::StretchImage;

imageFile = fileDialog->FileName;

if (imageFile == System::String::Empty)

return;

pic->Image = Image::FromFile(imageFile);

bitmapImage = gcnew Bitmap(imageFile);

GetProperties();

}