1. Close VS
2. Start RegEdit.exe
3. Find the following registry entry:
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
   \CurrentVersion\Ext\PreApproved
4. Add a new entry and name it
   {D245F352-3F45-4516-B1E6-04608DA126CC}
5. Close RegEdit
6. Start VS
7. Try and create a Smart Device C++ project

This is a known Visual Studio bug, which is caused by IE7 at your system. The other possibilities for fixing it are to install Visual Studion SP1 or to remove IE7 from your computer.

The cause was really strange. In my project there are some files that are attached to my project as Content . They have the property value copy if newer.  Having changed this property to always copy has solved the problem. Oh ye. After several wasted hours I could finally continue my work.

I’ve got this exception using DirectX on a PDA, trying to load a texture by TextureLoader.FromStream(dev,…) The same affect was achieved using TextureLoader.FromFile(dev, “fileName.png”). The exception came not every time during the execution, but rather sporadically. The device was absolutely ok all the time.

The real reason for DriverInvalidCallException in my case was the lack of memory. Notwithsdanging there was still enough programm memory (more than 10mb), data memory was almost full (only 1mb free). After cleaning the data space, the exception dissapeared. Hope this posting could help you.

Looking in the internet for possible solutions, I didn’t find any helpful tips. But I came across a very nice API called SharpGPS. This is a GPS library for .NET 2.0 and .NET 2.0 Compact Framework. The current version is 0.5 alpha I liked the structural organization of the .NET Solution. The project comrises even some GUIs for testing the implemented features. This API can suite well for those developers who don’t want to invent bicycle once again and don’t want to waste their time with parsing NMEA protocol strings. For alpha 0.5 it’s a good result. I hope that in the future this API will contain some methods for increasing the quality of GPS precision and offer solutions for the problems I talked about at the beginning of the posting.

Solution. Check once again, wether all the static content like images, video, files etc. are still in you project directory!!! Usually if a class is missing Visual Studio immediately inform you. But with static content it turned out to be not so obvious. The project we work on now is very large and contains a large directory tree with numerous html pages and images. My colleague deleted an image from SVN by mistake, but it was still registered in the solution. It took a while till I found the picture that was the cause for an unpleasant Friday morning

The function InputBox looks like:

public static string InputBox (

	       string Prompt,

  	       [OptionalAttribute] string Title,

 	       [OptionalAttribute] string DefaultResponse,

	       [OptionalAttribute] int XPos,

               [OptionalAttribute] int YPos)

There is a possibility to seperate the line of Promp string. For this purpose just use carriage return character (Chr(13)), a line feed character (Chr(10)), or a carriage return/line feed combination (Chr(13) & Chr(10)).

How the InputBox works is demonstrated in the example bellow:

string promptString = "Please enter something here";

String titleString = "Input Required";

String defaultResponse = "something";

int xPosition = 80;

int yPosition = 80;

string inputString =

Microsoft.VisualBasic.Interaction.InputBox(

promptString,

titleString,

defaultResponse,

xPosition,

yPosition

);

if(inputString != "") {

MessageBox.Show("You entered: " + inputString);

} else {

MessageBox.Show("You entered nothing or you just closed InputBox");

}

Please pay attention, that if you just close the InputBox your inputString will be empty.