Windows programming bitmaps

A device-independent bitmap is an external format, which allows bitmaps to be moved from one device to another. Device-dependent bitmaps are designed and optimised for use with a specific device device-dependent and hence are unsuitable for use in an environment for which they were not created. A typical example would be a bitmap created for video memory which is optimised for displaying screen output.

Device-independent bitmaps are typically created using an image editor. To load a bitmap for use in an application use the LoadImage function. This supersedes the LoadBitmap function. The prototype for this function is.

Where hInst — is a handle to the module of either a DLL or executable. UINT — The type of image to be loaded. If the function succeeds, the return value is the handle of the newly loaded image.

If the function fails, the return value is NULL. In order to display a bitmap, first two device contexts must be declared: one will hold the current device context while the other will create a second copy device context that will be used to store the bitmap until it is ready to be drawn in the window.

The sequence of events is as follows —. Where hdc is a handle to an existing DC. If you code your program efficiently. If you decided to change to another graphics system, you can do it easily without having much coding. There are several types of graphics system. Turbo C BGI driver. This driver can only display colour in x pixel mode and 16 colour in x mode. These modes are originated from the VGA display adapter. The minimum resolution is from x to maximum of x pixels.

These library routines have all the graphics system capabilities. Write Your Own! Why don't write your own graphics system. Have full controls to your monitor. This link has all you will need to write your own graphic system. Click here. There are many others system that you can use. You can search them in the SimTelnet or Garbo. Go to links page. The idType is set to 1. IdCount refers to number of icons in the icon file.

This is because some icon file have more than one icons stored in the file, this type of file consist of icons sized 16x16, 32x32 and so on. Next is the IconsDirectoryEntry, it tell the characteristic of the individual icons stored in the icon file.

The mask is in Monochrome format, i. Introduction to Bitmap Programming This tutorial explains what is Bitmap, and how to access them.

If you can understand the concept you can use any programming language to display bitmap. Bits and Bytes Consider a binary string. The representation is as follow. What is Bitmap? How do I access them? A bitmap. Therefore you should have knowledge of accessing binary formats file. B G R Unused [] 84 84 0 [] 84 0 [] 84 84 0 [] 84 0 [] 84 0 [] 0 [] 0 0 0 0 [] 0 0 0 [] 0 0 0 [] 0 0 [A] 0 0 0 [B] 0 0 [C] 0 0 [D] 0 [E] 84 84 84 0 [F] 84 84 0. Graphics System Our graphics must consist of Palette system - A routine that defines the colour palettes on the graphics system.

Pixel routine - A routine that put the pixel you read on the screen. Algorithm for displaying Bitmap The algorithm for displaying the bitmap file.

Specify which bitmap file to load Check the bitmap whether it is a valid bitmap. Use DeleteObject to release it after you have de-selected it from the compatible DC. Other than that, I think it should work. Thanks for your help. I will try your suggestions and see how it works out. One of the things I don't understand is the call return false but none of the message boxes get printed out.

Can you explain why? The if in line 17 is missing the braces, meaning only the MessageBox call is inside the if , then line 19 is inconditionally executed every time. You already follow the best practice of putting the value to the left when comparing inside if 's. Here's another good practice: Always add braces to your statements, even if you know for sure it is a one-liner.

Last edited on Feb 23, at pm UTC. Thanks buddy. Just notice that. Always good to have another pair of eyes looking at it. I fixed the braces but still no Message box printout in the call.