pfox_64

ok i need to know how to monitor a pixel. i want to create a program that lets u select a pixel then monitor it for change. after it changes it will play a sound. i have only worked on basic forms and the like. I just need some help on how to use the mouse to select a pixel.

Volte

Do you mean a pixel anywhere on the screen, or just on one of your own forms? You can use the GetPixel API to get the color of a pixel, and if you want to get the color of a pixel anywhere on the screen use the GetDC API with an hWnd parameter of 0 to get the hDC of the whole screen.

pfox_64

i need to be able to select the pixel to be monitored with the mouse. So i could monitor a pixel anywhere on the screen

Volte

The simplest way to do this is most likely to make it so rather than clicking on a specific pixel, the user has to push a specific key to select the pixel on which the mouse is hovering. The reason for this is that it's difficult to make your app process a click outside the main app window, so the program would lose focus and not be able to process the click.

Alternatively, you could "fake" it using a screenshot of the whole screen (This module includes a function that lets to take a screenshot of an hDC and return a Picture object called hDCToPicture. You could show that picture on a fullscreen form that allows you to click on it, return the pixel color, hide the form and continue normally. If it's done right it should look fairly transparent (other than any on-screen animation).