Thread: sprintf and tons of warnings with types - how to remove

Every time I use sprintf, I get this warning:

warning C4057: 'function' : 'char *' differs in indirection to slightly different base types from 'unsigned char [2048]'

I have the warning level set to the maximum, 4. Here's an example that causes this to get triggered:

Code:

// at the top
unsigned char TextString[2048]; // a basic string with plenty of room

... // in a function
sprintf(TextString, "This warning clutters things up, making error locations hard to find.");

I can't set the string upon the variable declaration because the string actually depends on many parameters. The output I'm getting is what I'm expecting though at least (or I won't be able to see any of the numbers, menus, etc. I have). If I recall about 6 months ago, I wasn't getting this warning at all with this same setup. Did some update to VC++ cause this to start happening?

I do need unsigned char or my text drawing function (this function provides word wrap) won't work due to the use of special characters (those after 0x7F such as the infinity symbol). I'm using a bitmap font of my own creation so I can essentially have anything after the 0x7F.

I know that you can have characters higher than 0x7F in a signed char. The reason I can't is because arrays cannot go negative. I have an array that contains the list of start positions and widths for each of the characters in the bitmap font (based on ASCII order until 0x7F) - anything above 0x7F will reference a negative array position causing the drawing to not work. Referencing 0x68, for example will have a reference to "CharWidth[104]" but referencing 0x90 would instead cause it to reference "CharWidth[-112]".

The use of pragma to disable it might help, though I have yet to try the typecasting route. There are several hundred cases of this so disabling that warning it might be more efficient. Thanks though.

Originally Posted by ulillillia

anything above 0x7F will reference a negative array position causing the drawing to not work. Referencing 0x68, for example will have a reference to "CharWidth[104]" but referencing 0x90 would instead cause it to reference "CharWidth[-112]".

The use of pragma to disable it might help, though I have yet to try the typecasting route. There are several hundred cases of this so disabling that warning it might be more efficient. Thanks though.

So why don't you fix the one drawing function to cast to unsigned, instead of the "several hundred cases" that don't need it?


Quzah.