C/C++ Programming Help Thread

[slicer4ever]

wow, i feel like an idiot, i didn't even read his full post and he had already created an answer, and yauster, thanks for the input

[DarkChazz]

When I compile anything with Minpspw on Vista Ultimate , it doesn't work , the whole system freezes , I can't click anything and I have to restart it.

PLEASE HELP !!!!

[Mr305]

I just can't seem to get this data structure to compile.

struct SColor
{
    union
    {
        unsigned int ARGB;
        struct
        {
            unsigned char A;
            unsigned char R;
            unsigned char G;
            unsigned char B;
        };
    };
};

Donot ask me "What are you trying to do? "

[Davee]

I just can't seem to get this data structure to compile.

struct SColor
{
    union
    {
        unsigned int ARGB;
        struct
        {
            unsigned char A;
            unsigned char R;
            unsigned char G;
            unsigned char B;
        };
    };
};

Donot ask me "What are you trying to do? "

I see you like very optimised code.

[pspersanonymous]

I just can't seem to get this data structure to compile.

struct SColor
{
    union
    {
        unsigned int ARGB;
        struct
        {
            unsigned char A;
            unsigned char R;
            unsigned char G;
            unsigned char B;
        };
    };
};

Donot ask me "What are you trying to do? "

Typically, when you say you have problems compiling something, you usually provide the compiler error to tell people what went wrong.

Anyway, why can't you get it to compile? What is wrong?

[Digikid13]

What is better, c or C++ to learn first? I wanted to start programing, but I don't know what one to learn. I don't want to learn both either.

[_dysfunctional]

Why are you limiting yourself to those two choices? Personally, I would suggest the magic that is Python.

Then again, some other people would disagree.

In case you didn't get the hint, please learn to google.

[Mr305]

Typically, when you say you have problems compiling something, you usually provide the compiler error to tell people what went wrong.

Anyway, why can't you get it to compile? What is wrong?

void ColorBlend( SColor Src, SColor Dest)
{
//NOTHING here 
}

main.c|168|error: expected ')' before 'Src'|

[Digikid13]

Why are you limiting yourself to those two choices? Personally, I would suggest the magic that is Python.

Then again, some other people would disagree.

In case you didn't get the hint, please learn to google.

Python, I tried to learn it, but I got no where, think you can link up some guides and such for it. I found nothing on Google......

[MoAShaun]

void ColorBlend( SColor Src, SColor Dest)
{
//NOTHING here 
}

main.c|168|error: expected ')' before 'Src'|

Make sure all other functions have been closed and declared, that's about it.

[Mr305]

Make sure all other functions have been closed and declared, that's about it.

Really???!
-=Double Post Merge =-
WOW... Interesting WIERDEST behaviuor


This seems to compile fine..

void ColorBlend (SColor ) { 
}

EVEN This breaks it:

void ColorBlend (SColor s) {

Are we dealing with a GCC bug here?

[_dysfunctional]

No, sounds more like it can't find where SColor is defined, make sure you are including the proper headers for it. Also, with the code you have posted it's hard to tell, paste more of the program so we can narrow it down.

[pspersanonymous]

void ColorBlend( SColor Src, SColor Dest)
{
//NOTHING here 
}

main.c|168|error: expected ')' before 'Src'|

No, you need to use like this:

void ColorBlend(struct SColor Src, struct SColor Dest)
{
//NOTHING here 
}

or redefine SColor as:

typedef struct SColor
{
    union
    {
        unsigned int ARGB;
        struct
        {
            unsigned char A;
            unsigned char R;
            unsigned char G;
            unsigned char B;
        };
    };
} SColor;

then:

void ColorBlend( SColor Src, SColor Dest)
{
//NOTHING here 
}

can work.

Read up more about structs.

EDIT:

It is imperative to know the difference between:

// With TAG
struct mytag
{
    int member;
};

struct mytag somevar;
somevar.member = 1;

// With VAR
struct
{
    int member;
} myvar;

myvar.member = 1;

// With TAG and VAR
struct mytag
{
    int member;
} myvar;

myvar.member = 1;
struct mytag anothervar;
anothervar.member = 1;

// As TYPE
typedef struct
{
    int member;
} mytype;

mytype somevar;
somevar.member = 1;

// As TYPE with TAG
typedef struct mytag
{
    int member;
} mytype;

struct mytag var1;
mytype var2;

These are C basics and any adequate book should teach this.

[Moca]

typedef struct{
// ...
}SColor;

[Auraomega]

I'm using a class to hold some random info, but when I access one classes data it gives me the last classes data instead, I'm just wondering if this is normal behaviour?

class blah
{
   private:
      int meh;
   public:
      ...
};

...
int main()
{
   blah a;
   blah b;
   /* code to setup meh for a and b to be different, but meh for a becomes what meh for b is*/
...
}

I thought each classes data was supposed to be seperate? But from what I'm seeing its not so...

-Aura

[Art]

Hi,
Has anyone got a file browser working with Intrafont they'd like to share?

I tried converting this one:
http://www.psp-programming.com/forum...ic,1333.0.html
works fine for me in debug screen,
but with Intrafont, it's printing the first page only, and then freezing.
My code is in the last page of that thread there.
Cheers, Art.

[yaustar]

@Auraomega: Then there is something wrong with the code you haven't shown. Post the minimal code needed to produce the bug you are describing.

#include <iostream>
using namespace std;

class blah
{
private:
	int meh;
public:
	int GetMeh() const { return meh; }
	void SetMeh( int aInt ) { meh = aInt; }
};

int main()
{
	blah a;
	blah b;

	a.SetMeh( 10 );
	b.SetMeh( 20 );

	cout << "a: " << a.GetMeh() << " b: " << b.GetMeh() << endl;
}

Gives:

a: 10 b: 20

[Auraomega]

@Auraomega: Then there is something wrong with the code you haven't shown. Post the minimal code needed to produce the bug you are describing.

Sorry for the vague discription, it was 4:30 am when I post that...

After some work today I noticed that the data isn't being written to the same place, but almost the same place. I'm partly following the NeHe tutorials on OpenGL, this is the problem code:

AUX_RGBImageRec *loadBMP(char *fileName)  //as taken from NeHe's tutorials -> http://nehe.gamedev.net
{
	FILE* image;
	
	if(!fileName) return NULL;
	
	image = fopen(fileName, "r");
	if(image)
	{
		fclose(image);
		return auxDIBImageLoad(fileName);
	}
	
	return NULL;
}

class icon
{
	private:
		unsigned int texture;
		
	public:
		icon(char* fileName);
		void drawIcon();
		void displayTexture()
		{
			FILE* fp;
			fp = fopen("output.txt", "a");
			fprintf(fp, "Texture - 0x%08X\n", texture);
		}
};

icon::icon(char* fileName)
{
	texture = 0;
	AUX_RGBImageRec *textureImage;
	
	memset(textureImage, 0, sizeof(void*)*1);
	textureImage = loadBMP(fileName);
	
	iconActive = false;
	
	if(textureImage)
	{
		glGenTextures(3, &texture);
		glBindTexture(GL_TEXTURE_2D, texture);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST_MIPMAP_NEAREST);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
		gluBuild2DMipmaps(GL_TEXTURE_2D, 3, textureImage->sizeX, textureImage->sizeY, GL_RGB, GL_UNSIGNED_BYTE, textureImage->data);
	}
}

When I run the displayTexture function for all 3 objects, it gives the following output:
Texture - 0x00000006
Texture - 0x00000009
Texture - 0x00000007
I guess this would be why the last image loaded is the only one that shows up (hence why I thought it was writing to the same area). I'm just not sure how to go about solving this?

Thanks again.
-Aura

[yaustar]

Are you saying that you have 3 different instances of icon that have 3 different textures but when it comes to rendering, they all show the same texture?

Edit:
Shouldn't:

glGenTextures(3, &texture);

Be:

glGenTextures(1, &texture);

Given:
http://www.opengl.org/documentation/...ntextures.html

[_dysfunctional]

1. GLaux is insanely outdated. I would suggest picking a better image loading library, such as DevIL or SOIL.
2. You open a file to print the address (in displayTexture()), but you never close the file.
3. OpenGL textures are just integers, there is no need to print them as hex.
4. "memset(textureImage, 0, sizeof(void*)*1);", This basically means "memset(textureImage, 0, 4);" or "textureImage = NULL". The last one is prefered. memset() should be used for data that is already allocated.
5. yaustar is correct. You are trying to generate 3 textures into space that will only allow one.

[Auraomega]

Thanks yaustar, that works, I copied that function from another project which for some reason required 3.

@_dysfunctional
1. I don't use GLaux, I use a GLaux replacement that was sent to me on Gamedev

2. Meh... it was 4:30 and it was just a hacky addition to see if could solve the problem

3. Above comment

4. Thanks I wasn't aware of that, I just assumed there was some reason to work that way because of the tutorials.

-Aura

[_dysfunctional]

Stop copying code! You'll never learn!

I highly suggest going and buying a nice (hard-copy) book on C++. You can find a list of books here (put together by yaustar).

[Auraomega]

Stop copying code! You'll never learn!

I highly suggest going and buying a nice (hard-copy) book on C++. You can find a list of books here (put together by yaustar).

Lol it was my own code from a few months back, I just never got very far in OGL and decided to start again from scratch, but grabbed that function and a few others from some old code to save on typing.

When Christmas is out the way and I have some money I plan on buying a book on C++ and C#, but until then its hard to justify the expence on a hobby.

-Aura

[yaustar]

When Christmas is out the way and I have some money I plan on buying a book on C++ and C#, but until then its hard to justify the expence on a hobby.

-Aura

If money is an issue, then read Thinking in C++ which is a free eBook.

More online resources can be found here.

[Art]

What is the quickest way to tell if an integer is evenly divisible by a given number (say 20)?
I know about the mod (modulus), but not sure if it's used with integers.

so with 20 as the example, I'd want to know when the said integer was 20,40,60,80,100,120, etc.

If the MOD operand does work with inegers, I guess it's just .... i = (x mod 20); if (i == 0) {yay!}
Cheers, Art.

[califrag]

yes i also believe this works

if ((x mod 20) == 0) { stuffz }

[Art]

Thanks, would have been easy to test I suppose.. laziness!

[pspersanonymous]

Yep, except the mod operand is the percent symbol, so properly it would be:

if ((x%20) == 0)
{
    // 'x' is evenly divisible by 20
}

[BlackBurd]

Does anyone know if theres a list of all the known functions that come in the standered sdk that can be used on the psp.

The only ones i know right know is:
scekernelexit();<-- allows quick exit
setupcallbacks(); <-- Allows home menu to be displayed

ide like to get a list but the one i really wanna know is the one that turns on and off the psp screen.

also in basic there was something called subs wich were like apps inside of apps where you can put everything in one source is there something like that for c/c++
ooh as an example of what im talking.

declare sub main
declare sub thq
sub main
     print "hello qj.net this is an example"
     input "are you a noob" ; yesno
     if yesno = YEAH then
          sub thq
     elseif yesno = Naw then
          print "thats good for you"
     end if
end sub

sub thq
     cls
     print "noobs are cool =}"
end sub

main

[_dysfunctional]

You obviously have no knowledge of C or C++, so before you even touch the PSP, I would suggest you go buy a nice book on C++ and download the Visual C++ Express. Get used to it, program on the PC for a while. Once you actually understand C++, you'll understand that you can just look in the SDK headers to find the function you want. Of course, without any knowledge of C++, it won't make any sense now. So, get to it, get reading.