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• Context Menu Shell Extension not working under Windows 7 64-bit

  - by Smejda

  I created very simple Context Menu using Shell Extension in C#. It works fine under Windows XP 32 bit but under Windows 7 64 bits menu items not appearing. I tried to build Setup output to x64 but no effect. Simple Source contains ContextMenu and Setup project is under http://bit.ly/9nGd41 Looks like Wow6432 should be handled by Setup project, same for registration and adding to Global Assembly Cache I would be appreciate for help / suggestions with this issue.

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• How to force user to user Administrator account in WinForms

  - by Smejda

  I have simple WinForms application where modifying Windows Registry. The problem is that in Vista / Windows 7 I need to force user to switch to administrator. I do not want to force user to Run as Administrator form start of the application. I want him to do it when there is necessity to write to registry. Best case scenario would be to reach exacly the same message which appear in lot's of Setups, when user need to 'switch' to Administrator so there is no necessity to Run as Administrator form beginning. How I can achieve this in .Net ?

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• How to make ARGB transparency using bitwise operators.

  - by Smejda

  I need to make transparency, having 2 pixels: pixel1: {A, R, G, B} - foreground pixel pixel2: {A, R, G, B} - background pixel A,R,G,B are Byte values each color is represented by byte value now I'm calculating transparency as: newR = pixel2_R * alpha / 255 + pixel1_R * (255 - alpha) / 255 newG = pixel2_G * alpha / 255 + pixel1_G * (255 - alpha) / 255 newB = pixel2_B * alpha / 255 + pixel1_B * (255 - alpha) / 255 but it is too slow I need to do it with bitwise operators (AND,OR,XOR, NEGATION, BIT MOVE)

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