C语言gd库画图

最新推荐文章于 2024-05-16 10:06:48 发布

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cgi中使用gd创建图片并且显示到网页上：

    gdImagePtr im;
    int back,border,blue;
    int xsize,ysize;
    char str[5];
    int size;
    char* ptr;

    xsize = 60;
    ysize = 20;
    sprintf(str,"%04d",1234);

    im = gdImageCreate(xsize,ysize);
    back = gdImageColorAllocate(im,255,255,255);
    border = gdImageColorAllocate(im, 0,0,0);
    blue = gdImageColorAllocate(im,30,130,211);
    gdImageFilledRectangle(im,0,0,xsize - 1,ysize - 1,back);
    gdImageRectangle(im,0,0,xsize - 1,ysize - 1,border);
    gdImageString(im, gdFontGetLarge(),
                  im->sx / 2 - (strlen(str) * gdFontGetLarge()->w / 2),
                  im->sy / 2 - gdFontGetLarge()->h / 2,
                  (unsigned char*)str, blue);

    //print html HEAD
    printf("Content-type: image/png\n\n");

    //write content
    ptr = gdImagePngPtr(im, &size);
    fwrite(ptr,size,1,stdout);
    gdFree(ptr);

    /* Destroy it */
    gdImageDestroy(im);