IPicture Problems
Author
When I run my program I get a fatal error (and naturally, it crashes). It compiles just fine. When I debug I find that the program has its problem at the
glBindTexture(GL_TEXTURE_2D, texid);
segment at the end. The error I get is "First-chance exception in Nexus.exe: 0xC0000005: Access Violation."
I don''t know why this isn''t working; I have an image in the images folder of my program called test.bmp.
This is the code I use to call the Ipicture functions:
GLuint *test;
BuildTexture("Images/test.bmp", *test);
As mentioned before, it compiles with no errors but crashes in the BuildTexture(); function. Any help?
GLuint *test;
BuildTexture("Images/test.bmp", *test);
You are deferencing an unitialised pointer.
I presume the fn() definition is
void BuildTexture(char *image, int *id);
If this is the case, you need to pass in the address of the integer like so
int IdThatWillBeSetByFunction;
BuildTexture("Images/test.bmp", &IdThatWillBeSetByFunction);
------------ Your example says --------
Create a pointer called "test" which "points to" a value of "unkown". And give that to the function
Hope this helps a little.. for a better understanding see the CFaq by Steve Summit.. Its explained very well in there.
BuildTexture("Images/test.bmp", *test);
You are deferencing an unitialised pointer.
I presume the fn() definition is
void BuildTexture(char *image, int *id);
If this is the case, you need to pass in the address of the integer like so
int IdThatWillBeSetByFunction;
BuildTexture("Images/test.bmp", &IdThatWillBeSetByFunction);
------------ Your example says --------
Create a pointer called "test" which "points to" a value of "unkown". And give that to the function
Hope this helps a little.. for a better understanding see the CFaq by Steve Summit.. Its explained very well in there.
Author
Oh...lol.
That helps, thanks, but the function is
int BuildTexture(char *szPathName, GLuint &texid).
I fixed it...I just declare GLuint test;, then I simply pass it off as test. No & or * operators
. *hits self on head*
Thanks again.
That helps, thanks, but the function is
int BuildTexture(char *szPathName, GLuint &texid).
I fixed it...I just declare GLuint test;, then I simply pass it off as test. No & or * operators
. *hits self on head*Thanks again.
int BuildTexture(char *szPathName, GLuint &texid)
If that is the definition it must be C++, C doesnt support the reference declaration.
Note that,
int BuildTexture(char *szPathName, GLuint &texid) -- reference
and
int BuildTexture(char *szPathName, GLuint *texid) -- pointer
are *very* similar.
Both internally pass a pointer to the variable texid, but the reference declaration - automatically dereferences the variable in the funtion body thus eliminating the need for dereferences in the code.
eg
Both work the same - albeit some subtle semantics. I suggest you read up on references and pointers and make sure you thoroughly understand them.
If that is the definition it must be C++, C doesnt support the reference declaration.
Note that,
int BuildTexture(char *szPathName, GLuint &texid) -- reference
and
int BuildTexture(char *szPathName, GLuint *texid) -- pointer
are *very* similar.
Both internally pass a pointer to the variable texid, but the reference declaration - automatically dereferences the variable in the funtion body thus eliminating the need for dereferences in the code.
eg
int x(int &y) int x(int &*y){ { y = 10; *y = 10;} }int x(int *y) int x(int **y){ { *y = 10; **y = 10;} }Both work the same - albeit some subtle semantics. I suggest you read up on references and pointers and make sure you thoroughly understand them.
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