C/C++ Programming Help Thread

[BlackShark]

Alright, one more n00b file browsing question,
the Current Directory is represented as "current_dir" and the current selection is represented as, "gameEntry[current_selection].name" . My question is how would i combined them?

Like if current_dir is "ms0:/PSP/MUSIC/" and gameEntry[current_selection].name is "BatCountry.mp3", how would you put them together? like "ms0:/PSP/MUSIC/BatCountry.mp3" ?

[hallo007]

char filePath[200];
strcpy(filePath , current_dir);
strcat(filePath , gameEntry[current_selection].name);

[BlackShark]

Thank you :)

[SG57]

BS - Make sure you use the safe versions of those functions

char filePath[200];
strncpy(filePath , sizeof(filePath)-1 , current_dir);
strncat(filePath , sizeof(filePath)-1 , gameEntry[current_selection].name);

Better yet, you may simplify these into 2 lines

char filePath[256];
snprintf(filePath,sizeof(filePath)-1,"%s%s",current_dir,gameEntry[current_selection].name);

[hallo007]

mayby explain why my method is bad , because it 100 procent works

[brethren]

mayby explain why my method is bad , because it 100 procent works

he didn't say bad, he said his method was safe, implying your method is unsafe. I'd like to know too as i use flash agent quite often

[hallo007]

he said BS , wich stand for ... ( I am not going to say it otherwhise i get banned again)

and flash agents doenst have problems with that anyway , when i test it , i write all path's it uses to a text file (kind of debug console) and it was all correct;)

[hallo007]

ow , lol

[yaustar]

strcpy can easily buffer overrun. Eg

char buffer[12] = "";
strcpy( buffer, "hello world!" ); // Dangerous, buffer overrun

With strncpy, you have to specify the number of characters you want to copy. Normally this is the size of the buffer.

C++ (or even better, use STL strings)

const int BUFFER_SIZE = 12;
char buffer[BUFFER_SIZE] = "";
strncpy( buffer, "Hello World!", BUFFER_SIZE-1 ); // buffer only contains "Hello World"

C

#define BUFFER_SIZE 12
char buffer[BUFFER_SIZE] = "";
strncpy( buffer, "Hello World!", BUFFER_SIZE-1 ); // buffer only contains "Hello World"

-= Double Post =-

thanks.

Here is my exact lib line in my IDE setup. Bare in mind that build.mak includes some of these libraries:

-lstdc++ -lm -lpspdebug -lpspdisplay -lpspge -lpspctrl -lpspsdk -lc -lpspnet -lpspnet_inet -lpspnet_apctl -lpspnet_resolver -lpsputility -lpspuser -lpspkernel

[MiG]

strcpy can easily buffer overrun. Eg

char buffer[12] = "";
strcpy( buffer, "hello world!" ); // Dangerous, buffer overrun

With strncpy, you have to specify the number of characters you want to copy. Normally this is the size of the buffer.

C++ (or even better, use STL strings)

const int BUFFER_SIZE = 12;
char buffer[BUFFER_SIZE] = "";
strncpy( buffer, "Hello World!", BUFFER_SIZE-1 ); // buffer only contains "Hello World"

C

#define BUFFER_SIZE 12
char buffer[BUFFER_SIZE] = "";
strncpy( buffer, "Hello World!", BUFFER_SIZE-1 ); // buffer only contains "Hello World"

-= Double Post =-

Here is my exact lib line in my IDE setup. Bare in mind that build.mak includes some of these libraries:

-lstdc++ -lm -lpspdebug -lpspdisplay -lpspge -lpspctrl -lpspsdk -lc -lpspnet -lpspnet_inet -lpspnet_apctl -lpspnet_resolver -lpsputility -lpspuser -lpspkernel

thanks, but it still complains everywhere string is used.

is it ok to use the include <string> ?

[yaustar]

thanks, but it still complains everywhere string is used.

is it ok to use the include <string> ?

Yes it is. What errors are you getting? Are you using the correct namespace? What does you current test code look like.

[MiG]

Yes it is. What errors are you getting? Are you using the correct namespace? What does you current test code look like.

****...

forgot the old using namespace std;

What a mug i feel like...

[BlackShark]

strcpy can easily buffer overrun. Eg

char buffer[12] = "";
strcpy( buffer, "hello world!" ); // Dangerous, buffer overrun

With strncpy, you have to specify the number of characters you want to copy. Normally this is the size of the buffer.

C++ (or even better, use STL strings)

const int BUFFER_SIZE = 12;
char buffer[BUFFER_SIZE] = "";
strncpy( buffer, "Hello World!", BUFFER_SIZE-1 ); // buffer only contains "Hello World"

C

#define BUFFER_SIZE 12
char buffer[BUFFER_SIZE] = "";
strncpy( buffer, "Hello World!", BUFFER_SIZE-1 ); // buffer only contains "Hello World"

lol, thanks to my "C++ for dummies" book i bought the other day, i under stood that :P

[slicer4ever]

blackshark r they paying u to advertise that book?.....jk=-)

[BlackShark]

lol, no but since I learned useful stuff from it i just feel obligated to it :P

[MrChaos]

Ugh. My mind is being retarted today.

Can some1 tell me how to call a image to the screen (my image is was a 16 bit, but i converted it to C.) I'm trying to figure it out, but I got's a blond moment right now.

I feel embarressed askin an easy question :P

[SG57]

Blond's (I being one) can at least make sense MrChaos ;) You want to load an image, but not from an external image. Rather, from an unsigned char array. If so, use bin2c, or GIMP and convert your image to an unsigned char array and point the Image *data to it.

[MrChaos]

Blond's (I being one) can at least make sense MrChaos ;) You want to load an image, but not from an external image. Rather, from an unsigned char array. If so, use bin2c, or GIMP and convert your image to an unsigned char array and point the Image *data to it.

That's what I did, but does it make it appear on the screen? (See, today I don't understand anything on coding...that's rare) :)

[PSPJunkie_]

Do you mean that you used bin2c? Is so, instead of loading an image using graphics.c, set your images manually. (Just make sure that if the width/height are odd, add one to it. It needs to be a multiple of two.)

Image* img;
img->imageWidth = /* real image width */;
img->imageHeight = /* real image height */;
img->textureWidth = /* real width (+1 if odd) */;
img->textureHeight = /* real height (+1 if odd) */;
img->data = /* variable image created with bin2c */;

blitAlphaImageToScreen(0, 0, img->imageWidth, img->imageHeight, img, 0, 0);

If you just need to load an image,

Image* img = loadImage("./myImage.png");
blitAlphaImageToScreen(0, 0, img->imageWidth, img->imageHeight, img, 0, 0);

[MrChaos]

Do you mean that you used bin2c? Is so, instead of loading an image using graphics.c, set your images manually. (Just make sure that if the width/height are odd, add one to it. It needs to be a multiple of two.)

Image* img;
img->imageWidth = /* real image width */;
img->imageHeight = /* real image height */;
img->textureWidth = /* real width (+1 if odd) */;
img->textureHeight = /* real height (+1 if odd) */;
img->data = /* variable image created with bin2c */;

blitAlphaImageToScreen(0, 0, img->imageWidth, img->imageHeight, img, 0, 0);

If you just need to load an image,

Image* img = loadImage("./myImage.png");
blitAlphaImageToScreen(0, 0, img->imageWidth, img->imageHeight, img, 0, 0);

Oo ok thank you. The first code is what I was trying to figure out.

[PSPJunkie_]

I figured that out after I posted it, but it took me a good minute to type that up. :)

[MrChaos]

Now I tryed what PSPJUNKIE_ told me to, but it's coming up with compiler errors.

This is the part of the code with the errors:

Image* logo;
logo->imageWidth = 470;
logo->imageHeight = 272;
logo->textureWidth = 471;
logo->textureHeight = 272;
logo->data = /* I would put data here, but it would be too big. */

The compiling errors are:

main.cpp:46: error: expected constuctor, destructor, or type conversion befor '->' token.
main.cpp:47: error: expected constuctor, destructor, or type conversion befor '->' token.
main.cpp:48: error: expected constuctor, destructor, or type conversion befor '->' token.
main.cpp:49: error: expected constuctor, destructor, or type conversion befor '->' token.
main.cpp:50: error: expected constuctor, destructor, or type conversion befor '->' token.

Yeah. I think I'm missing something (no duh?) I think it's classes, but I'm not sure.

[Archaemic]

Change

Image* logo;

to

Image *logo = new Image();

(Well, actually, new Image() probably takes two parameters, width and height.)

[MrChaos]

Change

Image* logo;

to

Image *logo = new Image();

(Well, actually, new Image() probably takes two parameters, width and height.)

Tried it, but it came up with the same errors.

[PSPJunkie_]

Trying changing all of the '->' to '.' (Periods).

[MrChaos]

Trying changing all of the '->' to '.' (Periods).

Weird. Still not compiling.

Just to make sure, do I have to create a "logo" class before I do that? Because I didn't if thats the problem.

EDIT: I created a logo class, and it still comes up with the same errors.

[Archaemic]

Trying changing all of the '->' to '.' (Periods).

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 ->

[MrChaos]

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 ->

Yeah, but neither one works, lol.

[yaustar]

Now I tryed what PSPJUNKIE_ told me to, but it's coming up with compiler errors.

This is the part of the code with the errors:

Image* logo;
logo->imageWidth = 470;
logo->imageHeight = 272;
logo->textureWidth = 471;
logo->textureHeight = 272;
logo->data = /* I would put data here, but it would be too big. */

The compiling errors are:

main.cpp:46: error: expected constuctor, destructor, or type conversion befor '->' token.
main.cpp:47: error: expected constuctor, destructor, or type conversion befor '->' token.
main.cpp:48: error: expected constuctor, destructor, or type conversion befor '->' token.
main.cpp:49: error: expected constuctor, destructor, or type conversion befor '->' token.
main.cpp:50: error: expected constuctor, destructor, or type conversion befor '->' token.

Yeah. I think I'm missing something (no duh?) I think it's classes, but I'm not sure.

Have you #include the head that defines the Image struct?

(regardless, the code will crash even if it does compile).

[MrChaos]

Have you #include the head that defines the Image struct?

(regardless, the code will crash even if it does compile).

No I havent, but let me see if that is the problem.

(Why would it crash?)