Code Talker Week12 開檔讀檔，鍵盤滑鼠

 STEP01

1.打開CodeBlock，開啟一個空白檔案(week12-1)

2.打上程式碼:

#include <stdio.h>

int main()

{

    FILE * fout = fopen("file.txt", "w");///w:write

    printf("Hello World\n");

    fprintf(fout, "Hello World在檔案裡\n");

}

注:fout是檔案指標，fopen開檔案(檔名, 用什麼模式)

3.執行除了跳出Hello World的小黑，另外會開啟file.txt，內容結果如下:

STEP02

1.再開啟一個新的空白檔案(week12-2)

2.打上程式碼:

#include <stdio.h>

int main()

{

    FILE * fin = fopen("file.txt", "r");///r:read

    char line[100];

    fscanf(fin, "%s",line);

    printf("從file.txt讀到了:%s\n",line);

    fscanf(fin, "%s",line);

    printf("從file.txt讀到了:%s\n",line);

}

3.執行得到結果:

因為中間有間隔，所以分開印兩次

STEP03

1.開啟一個新的空白檔案(week12-3)

2.week12-3程式碼如下:

#include <stdio.h>

int main()

{

    int a[10]={10,20,30,40,50,60,70,80,90,100};

    int b[10]={};

    FILE*fout=fopen("file2.txt","w");

    for(int i=0;i<10;i++){

        printf("%d ",a[i]);

        fprintf(fout,"%d ",a[i]);

    }

    printf("\n");

    fprintf(fout,"\n");

    fclose(fout);//使用中的關閉才能在下面使用

    FILE*fin=fopen("file2.txt","r");

    for(int i=0;i<10;i++){

        fscanf(fin," %d",&b[i]);

        printf("b%d:%d ",i,b[i]);

    }

    fclose(fin);

}

3.執行結果如下:

STEP04

1.開啟一個GLUT專案(week12-4)

2.改造Week05-2的程式碼變成:

#include <stdio.h>

#include <GL/glut.h>

float teapotX=0, teapotY=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef(teapotX,teapotY,0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

void mouse(int button, int state, int x, int y)

{

    if(state==GLUT_DOWN){

        teapotX = (x-150)/150.0;

        teapotY = (150-y)/150.0;

    }

    display();

}

int main(int argc, char *argv[])//main()主函式 進階版

{

    glutInit(&argc,argv);//把參數送給glutInit初始化

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);//雙緩衝區+3D深度功能

    glutCreateWindow("week12");//開GLUT視窗

    glutDisplayFunc(display);//顯示用的函式

    glutMouseFunc(mouse);

    glutMainLoop();

}

得到根據滑鼠點擊位置移動的茶壺

STEP05

1.在week12-4程式碼的基礎上，加上一些程式，程式碼結果:

#include <stdio.h>

#include <GL/glut.h>

FILE * fout = NULL;

FILE * fin = NULL;

float teapotX=0, teapotY=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef(teapotX,teapotY,0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

void mouse(int button, int state, int x, int y)

{

    if(state==GLUT_DOWN){

        teapotX = (x-150)/150.0;

        teapotY = (150-y)/150.0;

        if(fout==NULL) fout = fopen("file4.txt","w");

        fprintf(fout, "%f %f\n", teapotX, teapotY);

    }

    display();

}

void keyboard(unsigned char key,int x, int y)

{

    if(fin==NULL){

        fclose(fout);

        fin = fopen("file4.txt","r");

    }

    fscanf(fin, "%f %f", &teapotX, &teapotY);

    display();

}

int main(int argc, char *argv[])//main()主函式 進階版用

{

    glutInit(&argc,argv);//把參數送給glutInit初始化

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);//雙緩衝區+3D深度功能

    glutCreateWindow("week12");//開GLUT視窗

    glutDisplayFunc(display);//顯示用的函式

    glutMouseFunc(mouse);

    glutKeyboardFunc(keyboard);

    glutMainLoop();

}

2.執行結果測試:先用滑鼠點擊一個軌跡，按空白鍵確認是否照著剛才的軌跡再跑一次

3.在CodeBlocks project-properties 裡第二個Build target中工作執行目錄改成.

注:debug和release都要改，並記得save everything

4.把freeglut.dll複製到資料夾內

5.再執行是否成功