C/C++ Programming Help Thread

Have you done work with pointers and know how they work?

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Zitat von yaustar

Have you done work with pointers and know how they work?

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This is my first time working with them.
And I understand how they work, just not compleatly enough to notice bugs...yet.

How do you initialize an array SEPARATELY from its declaration? I want all elements to be intialized in one statement, not going through the indices one by one. Is there another way besides using a typedef struct?

'Found' the bug. That code is outside function scope. Eg

Code:

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Image * img;
img->width = 100;
//etc
int main()
{

}

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This is illegal syntax. You can create and declare, define and initialise variables outside function scope but you can't do anything more with them outside function scope.
-= Double Post =-

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Zitat von MrChaos

This is my first time working with them.
And I understand how they work, just not compleatly enough to notice bugs...yet.

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No you don't otherwise you would have noticed why it would crash immediately.

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Zitat von Archaemic

That wouldn't fix it. That's definitely a pointer to an object, and not an object in and of itself. Hence you'd use ->

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I understand that. I was just throwing it out there.

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Zitat von JustChris

How do you initialize an array SEPARATELY from its declaration? I want all elements to be intialized in one statement, not going through the indices one by one. Is there another way besides using a typedef struct?

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Code:

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int anArray1[4] = { 0 }; // All values in the array are 0
int anArray2[4] = { 1, 2, 4, 6 }; // The array has been given the values 1, 2, 4 and 6
int anArray3[4] = { 1, 2 }; // Illegal. You cannot partially initialise an array.

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Zitat von yaustar

'Found' the bug. That code is outside function scope. Eg

Code:

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Image * img;
img->width = 100;
//etc
int main()
{

}

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This is illegal syntax. You can create and declare, define and initialise variables outside function scope but you can't do anything more with them outside function scope.
-= Double Post =-

No you don't otherwise you would have noticed why it would crash immediately.

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I said I didn't understand them "compleatly" :P.

Ok, I fixed the 'bug'. But I need to fix something else. When I fixed it, then compiled, the compiler spit out 637 errors, saying that the image data is incorrect. I'm back to my first problem now. My logo data is this:

Code:

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logo->data = 0x7fff,0x7fff,0x7fff,0x7fff, // and so on...;

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Yeah, that's where it is. What SHOULD be in the logo data, instead of what I have?

Yaustar, that works in normal cases, but I guess I need to mention now that the array I'm trying to use is declared as a private member of a class. I can't initialize it in the class declaration. Ideally it needs to be initialized in one method, and other methods called after it would be able to use the array.

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Zitat von JustChris

How do you initialize an array SEPARATELY from its declaration? I want all elements to be intialized in one statement, not going through the indices one by one. Is there another way besides using a typedef struct?

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See what yaustar said, but his only works at the declaration moment, later in your code, you can't us eit anymore, you'll have to go to each indices.

++ B.

*Goes into a coma from banging had against wall"

bin2c spits a .c file out with the data definition already.

Do,

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img->data = variable_from_bin2c;

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Zitat von PSPJunkie_

*Goes into a coma from banging had against wall"

bin2c spits a .c file out with the data definition already.

Do,

Code:

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img->data = variable_from_bin2c;

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LOL! By this point you guys hate me now. Sorry guys, I studied C++, but apperently, haven't learned enough. But, I like to learn from expericence.

But...Now my compiler "can't convert short unsigned int [127840]' to Color* in assignment".

I think the compiler hates me too.

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Zitat von JustChris

Yaustar, that works in normal cases, but I guess I need to mention now that the array I'm trying to use is declared as a private member of a class. I can't initialize it in the class declaration. Ideally it needs to be initialized in one method, and other methods called after it would be able to use the array.

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In that case, you can't. You can't initialise arrays in the initialisation list of a construct.

If you are using C++ then you really should be using vectors instead of arrays otherwise your only other option is to use a for loop.

Maybe try masking it? I honestly don't know if that will do anything, though.

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Zitat von MrChaos

LOL! By this point you guys hate me now. Sorry guys, I studied C++, but apperently, haven't learned enough. But, I like to learn from expericence.

But...Now my compiler "can't convert short unsigned int [127840]' to Color* in assignment".

I think the compiler hates me too.

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An error is only useful if we see the code that refers to the error.

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Zitat von yaustar

An error is only useful if we see the code that refers to the error.

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It's:

logo->data = imageData;

But it referrs to the .c img file that bin2c made...

The first one is the only one with an assignment.

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Zitat von MrChaos

It's:

logo->data = imageData;

But it referrs to the .c img file that bin2c made...

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What is the datatype of logo->data and imageData?
What is the datatype of logo?
What is the declaration of the datatype of logo?
What is the declaration of the datatype of imageData?

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Zitat von yaustar

What is the datatype of logo->data and imageData?
What is the datatype of logo?
What is the declaration of the datatype of logo?
What is the declaration of the datatype of imageData?

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Datatype of logo = Not sure what you mean by that...
Declaration of the datatype of logo = Image* logo
Declaration of the datatype of imageData = unsigned short imageData

'data' is a u32, and imageData is an unsigned char.

Geez, look at the previous page. Logo is an Image*
E] Make that two pages ago

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Zitat von PSPJunkie_

'data' is a u32, and imageData is an unsigned char.

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Ok. I learn stuff every day. Thanks. :tup:

This is going to be problematic. Image->data is a Color * which is a typedef'ed u32 which is an unsigned int (32 bit). imageData however is an array of unsigned shorts which are 16 bit.

If you change the following code, it will compile but won't give you the correct results (ignoring the fact that the program will still crash).

Code:

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unsigned short imageData
// Change to
unsigned int imageData

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Basically, the data NEEDs to be in 32 bit format for this to work with graphics.h.

To make this painless, just load the image from a seperate image file rather then try to compile the data with the code. It isn't worth the hassle.

Um, try looking at graphics.h or the file that bin2c created.

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typedef u32 Color;

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and

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static unsigned char hw[] __attribute__((aligned(16)));

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Zitat von yaustar

This is going to be problematic. Image->data is a Color * which is a typedef'ed u32 which is an unsigned int (32 bit). imageData however is an array of unsigned shorts which are 16 bit.

If you change the following code, it will compile but won't give you the correct results (ignoring the fact that the program will still crash).

Code:

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unsigned short imageData
// Change to
unsigned int imageData

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Basically, the data NEEDs to be in 32 bit format for this to work with graphics.h.

To make this painless, just load the image from a seperate image file rather then try to compile the data with the code. It isn't worth the hassle.

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Ok. If I include it in the makefile, will it still show in the folder?

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Zitat von PSPJunkie_

Um, try looking at graphics.h or the file that bin2c created.

Code:

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typedef u32 Color;

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and

Code:

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static unsigned char hw[] __attribute__((aligned(16)));

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I don't have either at hand hance I asked for them.

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Zitat von MrChaos

Datatype of logo = Not sure what you mean by that...
Declaration of the datatype of logo = Image* logo
Declaration of the datatype of imageData = unsigned short imageData

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A short is 2 bytes.

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Zitat von PSPJunkie_

Um, try looking at graphics.h or the file that bin2c created.

Code:

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typedef u32 Color;

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and

Code:

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static unsigned char hw[] __attribute__((aligned(16)));

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I don't use bin2c (even though I said I did; I use graphicsto16bitc)

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Zitat von Archaemic

Geez, look at the previous page. Logo is an Image*
E] Make that two pages ago

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Saying it is an Image tells me nothing of the datatypes of the members hence I asked for a declaration since it is a non-standard datatype.

Chaos, save the image as a .raw, then bin2c it.

I never said anything about its members.

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Zitat von PSPJunkie_

Chaos, save the image as a .raw, then bin2c it.

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Can you do me a favor, and send me a link to bin2c? All I find is the one I have right now, and that aint it.

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Zitat von yaustar

I don't have either at hand hance I asked for them.



A short is 2 bytes.

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No worries, I was referring to MrChaos.

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Zitat von Archaemic

I never said anything about its members.

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I did by asking for the struct declaration. This information was not 2 pages back.

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Zitat von MrChaos

Can you do me a favor, and send me a link to bin2c? All I find is the one I have right now, and that aint it.

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It's part of the PSPSDK.

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Zitat von MrChaos

Can you do me a favor, and send me a link to bin2c? All I find is the one I have right now, and that aint it.

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It is in the bin folder of the compiler.

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Zitat von PSPJunkie_

It's part of the PSPSDK.

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Oh, ok. Got it.


EDIT: Ugh. Won't run. Screw it guys, I'll just make it open up the image file, but ty for all your help.

But I'll ask the second time, if I include a pic in the makefile, will it still need to be in the folder after I compile?

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Zitat von yaustar

I did by asking for the struct declaration. This information was not 2 pages back.

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Yeah, but you also asked what type logo was, and that information WAS. That's all I'm saying.

MrChaos: Yes

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Zitat von Archaemic

Yeah, but you also asked what type logo was, and that information WAS. That's all I'm saying.

MrChaos: Yes

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Ok, thanks.

Open up terminal. Type,

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Zitat von bin2c

bin2c inImageFile.raw outSourceFile.h image_variable_name

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You need to be in to directory of the image, not bin2c. So you could do,

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bin2c logo.raw logo.h logo

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and you would refer to the image as 'logo' in your sources.

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Zitat von Archaemic

Yeah, but you also asked what type logo was, and that information WAS. That's all I'm saying.
MrChaos: Yes

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Point.

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Zitat von PSPJunkie_

Open up terminal. Type,



You need to be in to directory of the image, not bin2c. So you could do,



and you would refer to the image as 'logo' in your sources.

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Ah. Ok. When I try this tomorrow, where does the *.raw have to be at?