Memory Allocation in ANSI C
Author
I am writeing a game app ment to run on a UNIX server so I have to use ANSI C.
Everytime malloc expects a constant expressions.
Anyone know a command that doesn''t?
malloc should be able to take a non-constant argument. How exactly are you using malloc, and what error are you getting?
I''m quite certain either the error is on the line before it, or you''re using an improper syntax while calling the variable. Please post the offending line of code (plus say about 5 lines before & 5 lines after). We can''t tell what''s wrong from the information you''ve given us.
Author
nope,
here is the REALY screwy call I have to make.
Remind me to hurt compuserve very much for their wonderful GIF format..
here is the REALY screwy call I have to make.
global[nGifNumber]->entry = (struct COLORTABLE *)malloc( sizeof(struct RGBTRIPLET[gdata[nGifNumber].nGCTSize]) );// Here are the errors I get.error C2057: expected constant expressionwarning C4047: ''='' : ''struct RGBTRIPLET *[1]'' differs in levels of indirection from ''struct COLORTABLE *''error C2106: ''='' : left operand must be l-value Remind me to hurt compuserve very much for their wonderful GIF format..
It''s sizeof that''s generating the error, not malloc. You really need to simplify this line of code.
I''m a mite confused at what you''re calculating the sizeof()...but I think that you''ve got a structure defined called RGBTRIPLET - have you typedef''ed it something like this ?
If you have I think what you should do is:
If when you typedef''ed the RGBTRIPLET (it''s not a standard typedef is it ?) you should have the name at the end, if you haven''t, then IMO you aught to do it as I illustrated at the top of this post
typedef struct { BYTE r, g, b;} RGBTRIPLET; If you have I think what you should do is:
global[nGifNumber]->entry = (struct COLORTABLE *)malloc( ( sizeof(RGBTRIPLET) * gdata[nGifNumber].nGCTSize ); If when you typedef''ed the RGBTRIPLET (it''s not a standard typedef is it ?) you should have the name at the end, if you haven''t, then IMO you aught to do it as I illustrated at the top of this post
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