C / C++ / MFC

Re: Strange Initialize..........

19-Dec-09 21:40

forPower wrote:

vector(int s)       //constructor
:sz(s),           //"initialize sz", I have no idea what does it mean that writting?
elem(new double[s])       //initialize elem, and the same as above

It means set the variable sz to the value of the constructor parameter s, and set the variable elem to point to a new array of doubles, of length s. It is a shorthand alternative to writing the lines

sz = s;
elem = new double[s];

«_Superman_»20-Dec-09 4:57

«_Superman_»

20-Dec-09 4:57

A value can be put in a variable by either initialization and assignment.

Here is the difference -

// Initializing a variable with a value.
double d = 25.4;

// Assigning a value to a variable.
double d;
d = 25.4;

What you're doing is initializing a class member variable because you cannot do the initialization as I did above inside a class. (You can if the variable is a static const variable.)

Read about it here - Initializing C++ Class Members[^]

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

how to use this code ??

a04.lqd19-Dec-09 6:19

19-Dec-09 6:19

i have this code to load a bmp picture. but i don't know how to use it.!!!

<br />
#include "stdafx.h"<br />
#include "glaux.h"<br />
#include "glut.h"<br />

<br />
GLuint    texture[6];<br />

<br />
int LoadGLTextures()<br />
{<br />
    int Status=FALSE;                                    // Status Indicator<br />
<br />
    AUX_RGBImageRec *TextureImage[1];                    // Create Storage Space For The Texture<br />
<br />
    memset(TextureImage,0,sizeof(void *)*2);               // Set The Pointer To NULL<br />
<br />
    // Load The Bitmap, Check For Errors, If Bitmap's Not Found Quit<br />
    if (TextureImage[0]=LoadBMP("apple.bmp"))<br />
    {<br />
        Status=TRUE;                                    // Set The Status To TRUE<br />
<br />
        glGenTextures(3, &texture[0]);      // Create Three Textures<br />
        // Create Nearest Filtered Texture<br />
        glBindTexture(GL_TEXTURE_2D, texture[0]);<br />
        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST); // ( NEW )<br />
        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST); // ( NEW )<br />
        glTexImage2D(GL_TEXTURE_2D, 0, 3, <br />
        TextureImage[0]->sizeX, TextureImage[0]->sizeY,0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);<br />
<br />
        // Create Linear Filtered Texture<br />
        glBindTexture(GL_TEXTURE_2D, texture[1]);<br />
        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);<br />
        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);<br />
        glTexImage2D(GL_TEXTURE_2D, 0, 3, <br />
        TextureImage[0]->sizeX, TextureImage[0]->sizeY,0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);<br />
<br />
        // Create MipMapped Texture<br />
        glBindTexture(GL_TEXTURE_2D, texture[2]);<br />
        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);  // ( NEW )<br />
        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST);<br />
        gluBuild2DMipmaps(GL_TEXTURE_2D, 3, TextureImage[0]->sizeX,TextureImage[0]->sizeY, GL_RGB, GL_UNSIGNED_BYTE,TextureImage[0]->data);               // ( NEW )<br />
<br />
<br />
        if (TextureImage[0])                            // If Texture Exists<br />
        {<br />
            if (TextureImage[0]->data)            // If Texture Image Exists<br />
            {<br />
                free(TextureImage[0]->data);    // Free The Texture Image Memory<br />
            }<br />
            free(TextureImage[0]);                // Free The Image Structure<br />
        }<br />
    }<br />
<br />
    return Status;   <br />
}<br />
//-----------------------------------------------------------------------------<br />
AUX_RGBImageRec * LoadBMP(char *Filename)<br />
{<br />
    FILE *File=NULL;                                    // File Handle<br />
<br />
    if (!Filename)                                        // Make Sure A Filename Was Given<br />
    {<br />
        return NULL;                                    // If Not Return NULL<br />
    }<br />
<br />
    File=fopen(Filename,"r");                            // Check To See If The File Exists<br />
<br />
    if (File)                                            // Does The File Exist?<br />
    {<br />
        fclose(File);                                    // Close The Handle<br />
        return auxDIBImageLoad(Filename);                // Load The Bitmap And Return A Pointer<br />
    }<br />
<br />
    return NULL;   <br />
}<br />

loyal ginger19-Dec-09 6:48

loyal ginger

19-Dec-09 6:48

What you need to do is to get an idea on what to do to use an image as texture with OpenGL by reading the code you posted. Then you can incorporate that into your project. The basic idea is not that complicated.

If the piece of code you provided is part of a sample project, you can compile and run the project to see how it works.

Hope this helps. Happy programming!

a04.lqd19-Dec-09 8:27

19-Dec-09 8:27

Can you write a simple code which use this code as an example?

thank very much. Smile | :)

Rajesh R Subramanian19-Dec-09 8:37

Rajesh R Subramanian

19-Dec-09 8:37

I think the code you've provided is already an example and "simple" enough (saw the inline comments?)

“Follow your bliss.” – Joseph Campbell

a04.lqd19-Dec-09 14:23

19-Dec-09 14:23

but i put apple.bmp in the same folder with main code, write int main() to use it. then it did not work.

int main(int argc, char* argv[]) 
{	
	
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB); 
	glutInitWindowSize(640, 480); 
	glutInitWindowPosition(0, 0); 
	glutCreateWindow("Hello OpenGL!");
	OnInit(); 
	glutDisplayFunc(OnDraw); 
	glutReshapeFunc(OnSize);
	glutIdleFunc(OnIdle);
	glutKeyboardFunc(OnKey);
	//---------------------------
	glutMouseFunc(OnMouse);
	glutSpecialFunc(OnKeySpecial);

        LoadGLTextures();

	//---------------------------
	glutMainLoop();
	return 0;
}

Tim Craig19-Dec-09 21:55

19-Dec-09 21:55

Did you debug it to see if it could not find the file or bitmap failed to load? If you're using Visual Studio, I think you need to put the bitmap in the folder with the executable, not the source so Release or Debug.

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

a04.lqd20-Dec-09 3:50

20-Dec-09 3:50

this is my project. draw B-spline by De Boor method, and use it to take boundary of bmp picture.
http://www.mediafire.com/?4m2jrmg3lyv[^]

Tim Craig20-Dec-09 14:17

20-Dec-09 14:17

That's it? Where did the executable file end up?

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

a04.lqd20-Dec-09 14:32

20-Dec-09 14:32

the problem is:
i have this code to load bmp picture, but i don't know how to use.

int LoadGLTextures();

i only need to load bmp picture.

Tim Craig20-Dec-09 17:11

plese help me these error !!

20-Dec-09 17:11

Do you still have the box your computer came in? D'Oh! | :doh:

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

a04.lqd19-Dec-09 5:15

Re: plese help me these error !!

19-Dec-09 5:15

main.obj : error LNK2001: unresolved external symbol _auxDIBImageLoadA@4
Debug/main.exe : fatal error LNK1120: 1 unresolved externals

loyal ginger19-Dec-09 5:37

loyal ginger

19-Dec-09 5:37

In your project settings, add the file Glaux.lib to your "import" box of the link section.

Hope this helps. Happy programming!

may i have openGL version 1.1 or higher ???

a04.lqd19-Dec-09 4:51

Re: may i have openGL version 1.1 or higher ???

19-Dec-09 4:51

please share me link to down

CPallini19-Dec-09 4:56

CPallini

19-Dec-09 4:56

You may download the latest OpenGL SDK here [^].
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: may i have openGL version 1.1 or higher ???

C^hris L^osinger19-Dec-09 4:56

C^hris L^osinger

19-Dec-09 4:56

OpenGL comes with Windows

image processing toolkits | batch image processing

Re: may i have openGL version 1.1 or higher ???

Tim Craig19-Dec-09 9:23

19-Dec-09 9:23

Not higher than 1.1. Another standards body they should have not let Microsoft join. Mad | :mad:

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

C to SQL Connentivity

DarkSorrow3819-Dec-09 2:56

DarkSorrow38

19-Dec-09 2:56

I have written a C program to insert a row in SQL Server 2000 but it seems not to work.

#include<stdio.h>
#include<conio.h>

int main(void)
{
	int number;
	char fname[80], lname[80];
	clrscr();
	printf("Enter a number : ");
	scanf("%d",&number);
	printf("Enter your first name : ");
	scanf("%s",fname);
	printf("Enter your last name  : ");
	scanf("%s",lname);
	execl sql include sqlca;
	execl sql insert into Table1  
             values(number,",'",fname,"','",lname,"'");
	getch();
	return 0;
}

Richard MacCutchan19-Dec-09 3:06

19-Dec-09 3:06

Ishaan Karnik wrote:
I have written a C program to insert a row in SQL Server 2000 but it seems not to work.

Could you explain what it is that does not work?

DarkSorrow3819-Dec-09 3:59

DarkSorrow38

19-Dec-09 3:59

The error i recieve while compiling

Compiling ..\SOURCE\SQL.C
Error  ..\SOURCE\SQL.C 15: Undefined symbol 'execl'
Error  ..\SOURCE\SQL.C 15: Statement missing ;
Error  ..\SOURCE\SQL.C 16: Statement missing ;

Richard MacCutchan19-Dec-09 4:06

19-Dec-09 4:06

Ishaan Karnik wrote:
Undefined symbol 'execl'

Well I guess there is no such command in the C language!

DarkSorrow3819-Dec-09 4:44

DarkSorrow38

19-Dec-09 4:44

I have taken the command from SQL The Complete Reference.

harold aptroot19-Dec-09 6:26

harold aptroot

19-Dec-09 6:26

It looks like unix command line codes instead of C, but maybe that's just me

Richard MacCutchan19-Dec-09 7:20