c语言调用图片

c语言调用图片

图片也是一个文件，
1.你是要打开图片吗？（把图像显示出来？）
2.还是只需要图片文件。
如果是1，那么你需要看.bmp的编码方式和C库的图像类函数
如果是2，那么你就可以用fopen,fread,fwrite,fprintf,fscanf等调用即可。

#include
#include
#include
#include void selectpage(char page)
{
union REGS r;
r.x.ax=0x4f05;
r.x.bx=0;
r.x.dx=page;
int86(0x10,&r,&r);
} unsigned char set_SVGA_mode(int Vmode)
{
union REGS r;
r.x.ax=0x4f02;
r.x.bx=Vmode;
int86(0x10,&r,&r);
return(r.h.ah);
}unsigned int get_SVGA_mode()
{
union REGS r;
r.x.ax=0x4f03;
int86(0x10,&r,&r);
return(r.x.bx);
}void main()
{
char buffer[640],page_new=0,page_old=0;
int i,j,k,n,r,g,b,savemode;
long position,width,length;
FILE *fp;
puts("This is a 256 color bmp viewer!");
puts("Input filename:");
gets(buffer);
if((fp=fopen(buffer,"rb"))==NULL)
{
printf("can't open file:%s",buffer);
return;
}
fseek(fp,28,SEEK_SET);
fread(&i,2,1,fp);
if(i!=8)
{
puts("Not a 256 color bitmap!");
fclose(fp);
exit(0);
}

fseek(fp,18,SEEK_SET);
fread(&width,4,1,fp);
savemode=get_SVGA_mode();
set_SVGA_mode(0x101);
fseek(fp,54,SEEK_SET);
for(i=0;i<256;i++)
{
b=fgetc(fp);
g=fgetc(fp);
r=fgetc(fp);
outportb(968u,i);
outportb(969u,r>>2);
outportb(969u,g>>2);
outportb(969u,b>>2);
fgetc(fp);
}

k=(width%4)?(4-width%4):0;
for(j=length-1;j>=0;j--)
{
fread(buffer,width,1,fp);
for(i=0,n=0;i {
position=j*640l+i;
page_new=position/65536l;
if(page_new!=page_old)
{
selectpage(page_new);
page_old=page_new;
}
pokeb(0xa000,position%65536l,buffer[n]);
}
fseek(fp,k,SEEK_CUR);
}
fclose(fp);
bioskey(0);
set_SVGA_mode(savemode);
}

c语言调用图片函数
据我所知Matlab有,imshow(),c好象没有,c只能先将图片读到内存中,经过相关处理后以一定的格式保存到硬盘中,然后再打开图片.
读图和存图需要有专门的函数,这些可以参考:
unsigned char* ReadBMPData(int Width, int Height, char *fname)//图像的宽和高,图像的位置(包括后缀)
{
unsigned char* image = new unsigned char[Width*Height];
FILE *fp;
fp = fopen(fname, "rb");
fread(image, 1, Width*Height, fp);
fclose(fp);
return image;
}
///////////////////////////
void WriteRawData(unsigned char* image, int Width, int Height, char *fname)
{
FILE *fp;
fp = fopen(fname, "wb");
fwrite(image, 1, Width*Height, fp);
fclose(fp);
}