argument type mismatch ??

COL_WHITE is by convention probably defined as an embedded color code:

PHP Code:

{FFFFFF} // white 


Embedded color codes can only be used in the middle of strings, hence them being embedded:

PHP Code:

""COL_WHITE"This is white\n"COL_GREEN"While this is green." 


Colors as function arguments must be in their hexadecimal form:

PHP Code:

0xFFFFFFFF //white 


In your case, you should define the color with its hexadecimal value:

PHP Code:

#define COLOR_WHITE 0xFFFFFFFF 


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argument type mismatch ??