256色的图像放大程序，可是图像却显示不出来，求大神指点（附程序）
#include <windows.h>
#include <stdio.h>
unsigned char *pBmpBuf; //读入图像数据的指针
unsigned char *pNewBmpBuf;
int bmpWidth;//图像的宽
int bmpHeight;//图像的高
RGBQUAD *pColorTable;//颜色表指针
int biBitCount;//图像类型，每像素位数
int biClrUsed;
long newBmpWidth;//变化后图像的宽
long newBmpHeight;//变化后图像的高
long newLineByte; //变化后图像数据每行的字节数
float FXZOOMRATIO;
float FYZOOMRATIO;
/****************************************************************************
*函数名称：readBmp()
*函数参数：const char *bmpName 读入bmp格式文件的名称及路径
*函数返回值：0为失败 1为成功
*函数描述：给定文件的名称和路径 读入图像的位图数据，宽，高，及每个像素的位数进内存，保存在全局变量中
*
***************************************************************************/
bool readBmp(const char* bmpName)
{
FILE *fp=fopen(bmpName,"rb");
if(fp==0)
{
printf("cannot open file");
return 0;
}
fseek(fp,sizeof(BITMAPFILEHEADER),0);
BITMAPINFOHEADER head;
fread(&head,sizeof(BITMAPINFOHEADER),1,fp);
bmpWidth = head.biWidth;
bmpHeight = head.biHeight;
biBitCount = head.biBitCount;
biClrUsed = head.biClrUsed;
int lineByte = (bmpWidth *biBitCount/8+3)/4*4;//计算图像每行像素所占的字节数
pColorTable = new RGBQUAD[256];
pBmpBuf = new unsigned char [lineByte *bmpHeight+1];
fread(pBmpBuf,1,lineByte *bmpHeight,fp);
fclose(fp);
return 1;
}
/****************************************************************************
*函数名称： saveBmp()
*函数参数： const char *bmpName 写入bmp格式文件的名称及路径
unsigned char *imgBuf 待存盘的位图数据
int width, 以像素为单位待存盘的位图宽
int height, 以像素为单位待存盘的位图高
int biBitCount, 每个像素占的位数
RGBQUAD *pColorTable 颜色表指针
*函数返回值：0为失败 1为成功
*函数描述：给定写入bmp文件的名称和路径 要写入图像的位图数据，宽，高，写进文件中
*
***************************************************************************/
bool saveBmp(const char* bmpName,unsigned char *imgBuf,int width,int height,int biBitCount,RGBQUAD *pColorTable)
{
if(!imgBuf)//imgBuf 待存盘的位图数据
return 0;
int lineByte = (width * biBitCount/8+3)/4*4;
FILE *fp = fopen(bmpName,"wb");
if(fp == 0) return 0;
BITMAPFILEHEADER fileHead;
fileHead.bfType= 0x4d42;
fileHead.bfSize = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER) +sizeof(RGBQUAD)*256+lineByte *height;
fileHead.bfReserved1 = 0;
fileHead.bfReserved2 = 0;
fileHead.bfOffBits = 54+sizeof(RGBQUAD)*256;
fwrite(&fileHead,sizeof(BITMAPFILEHEADER),1,fp);
BITMAPINFOHEADER head;
head.biBitCount = biBitCount;
head.biClrImportant = 0;
head.biClrUsed = biClrUsed;
head.biCompression = 0;
head.biHeight = height;
head.biPlanes =1;
head.biSize = 40;
head.biSizeImage = lineByte *height;
head.biWidth = width;
head.biXPelsPerMeter = 0;
head.biYPelsPerMeter = 0;
fwrite(&head,sizeof(BITMAPINFOHEADER),1,fp);
fwrite(pColorTable,sizeof(RGBQUAD),256,fp);
fwrite(imgBuf,height * lineByte,1,fp);
fclose(fp);
return 1;
}
/****************************************************************************
*函数名称： bmpzoom()
*函数参数： const char* szSrcBmp 原bmp图片的名称和路径
const char* szDstBmp 变化后保存bmp图片后的文件路径
*函数返回值:0为失败 1为成功
*函数描述： 传入图片变化比例系数参数FXZOOMRATIO和FYZOOMRATIO 实现图片放大缩小
*
***************************************************************************/
bool bmpzoom(const char* szSrcBmp, const char* szDstBmp)
{
readBmp(szSrcBmp);
newBmpWidth = (long) (bmpWidth * FXZOOMRATIO+0.5);
newBmpHeight = (long) (bmpHeight * FYZOOMRATIO+0.5);
newLineByte = (newBmpWidth * biBitCount/8+3)/4*4;
pNewBmpBuf = new unsigned char [newLineByte * newBmpHeight+1];
//printf("width = %d, height = %d,biBitCount = %d\n",bmpWidth,bmpHeight,biBitCount);
//printf("newwidth = %d, newheight = %d,biBitCount = %d\n",newBmpWidth,newBmpHeight,biBitCount);
long i,j,k;
long i0,j0;
int lineByte =(bmpWidth*biBitCount/8+3)/4*4;
{for(i = 0;i < newBmpHeight;i++)
{
for(j = 0; j<newBmpWidth;j++)
i0 = (long)(i/FYZOOMRATIO);
j0 = (long)(j/FXZOOMRATIO);
if((j0 >=0) && (j0 < bmpWidth) && (i0 >=0)&& (i0 <bmpHeight))
{
*(pNewBmpBuf+i*newLineByte+j) = *(pBmpBuf+i0*lineByte+j0);
}
else
{
*(pNewBmpBuf+i*newLineByte+j)=255;
}
}
}
saveBmp(szDstBmp,pNewBmpBuf,newBmpWidth,newBmpHeight,biBitCount,pColorTable);
delete []pBmpBuf;
delete []pNewBmpBuf;
delete []pColorTable;
return 1;
}
/***********************************************************************
*函数名称：main()
*参数 空
*返回值 空
*描述：图像变化的访问
***************************************************************************/
void main()
{
char str1[80];
char str2[80];
printf("输入bmp文件名称和路径:\n");
gets(str1);
printf("输入bmp文件保存的名称和路径:\n");
gets(str2);
printf("请输入X方向的放缩比例:\n");
scanf("%f",&FXZOOMRATIO);
printf("请输入Y方向的放缩比例:\n");
scanf("%f",&FYZOOMRATIO);
bmpzoom(str1,str2);
}
[解决办法]
注意以下代码中的★
#include <windows.h>
#include <stdio.h>
unsigned char *pBmpBuf; //读入图像数据的指针
unsigned char *pNewBmpBuf;
int bmpWidth;//图像的宽
int bmpHeight;//图像的高
RGBQUAD *pColorTable;//颜色表指针
int biBitCount;//图像类型，每像素位数
int biClrUsed;
long newBmpWidth;//变化后图像的宽
long newBmpHeight;//变化后图像的高
long newLineByte; //变化后图像数据每行的字节数
float FXZOOMRATIO;
float FYZOOMRATIO;
/****************************************************************************
*函数名称：readBmp()
*函数参数：const char *bmpName 读入bmp格式文件的名称及路径
*函数返回值：0为失败 1为成功
*函数描述：给定文件的名称和路径 读入图像的位图数据，宽，高，及每个像素的位数进内存，保存在全局变量中
*
***************************************************************************/
bool readBmp(const char* bmpName) {
FILE *fp=fopen(bmpName,"rb");
if(fp==0) {
printf("cannot open file");
return 0;
}
fseek(fp,sizeof(BITMAPFILEHEADER),0);
BITMAPINFOHEADER head;
fread(&head,sizeof(BITMAPINFOHEADER),1,fp);
bmpWidth = head.biWidth;
bmpHeight = head.biHeight;
biBitCount = head.biBitCount;
biClrUsed = head.biClrUsed;
int lineByte = (bmpWidth *biBitCount/8+3)/4*4;//计算图像每行像素所占的字节数
pColorTable = new RGBQUAD[256];
fread(pColorTable,sizeof(RGBQUAD),256,fp);//★
pBmpBuf = new unsigned char [lineByte *bmpHeight+1];
fread(pBmpBuf,1,lineByte *bmpHeight,fp);
fclose(fp);
return 1;
}
/****************************************************************************
*函数名称： saveBmp()
*函数参数： const char *bmpName 写入bmp格式文件的名称及路径
unsigned char *imgBuf 待存盘的位图数据
int width, 以像素为单位待存盘的位图宽
int height, 以像素为单位待存盘的位图高
int biBitCount, 每个像素占的位数
RGBQUAD *pColorTable 颜色表指针
*函数返回值：0为失败 1为成功
*函数描述：给定写入bmp文件的名称和路径 要写入图像的位图数据，宽，高，写进文件中
*
***************************************************************************/
bool saveBmp(const char* bmpName,unsigned char *imgBuf,int width,int height,int biBitCount,RGBQUAD *pColorTable) {
if(!imgBuf)//imgBuf 待存盘的位图数据
return 0;
int lineByte = (width * biBitCount/8+3)/4*4;
FILE *fp = fopen(bmpName,"wb");
if(fp == 0) return 0;
BITMAPFILEHEADER fileHead;
fileHead.bfType= 0x4d42;
fileHead.bfSize = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER) +sizeof(RGBQUAD)*256+lineByte *height;
fileHead.bfReserved1 = 0;
fileHead.bfReserved2 = 0;
fileHead.bfOffBits = 54+sizeof(RGBQUAD)*256;
fwrite(&fileHead,sizeof(BITMAPFILEHEADER),1,fp);
BITMAPINFOHEADER head;
head.biBitCount = biBitCount;
head.biClrImportant = 0;
head.biClrUsed = biClrUsed;
head.biCompression = 0;
head.biHeight = height;
head.biPlanes =1;
head.biSize = 40;
head.biSizeImage = lineByte *height;
head.biWidth = width;
head.biXPelsPerMeter = 0;
head.biYPelsPerMeter = 0;
fwrite(&head,sizeof(BITMAPINFOHEADER),1,fp);
fwrite(pColorTable,sizeof(RGBQUAD),256,fp);
fwrite(imgBuf,height * lineByte,1,fp);
fclose(fp);
return 1;
}
/****************************************************************************
*函数名称： bmpzoom()
*函数参数： const char* szSrcBmp 原bmp图片的名称和路径
const char* szDstBmp 变化后保存bmp图片后的文件路径
*函数返回值:0为失败 1为成功
*函数描述： 传入图片变化比例系数参数FXZOOMRATIO和FYZOOMRATIO 实现图片放大缩小
*
***************************************************************************/
bool bmpzoom(const char* szSrcBmp, const char* szDstBmp) {
readBmp(szSrcBmp);
newBmpWidth = (long) (bmpWidth * FXZOOMRATIO+0.5);
newBmpHeight = (long) (bmpHeight * FYZOOMRATIO+0.5);
newLineByte = (newBmpWidth * biBitCount/8+3)/4*4;
pNewBmpBuf = new unsigned char [newLineByte * newBmpHeight+1];
//printf("width = %d, height = %d,biBitCount = %d\n",bmpWidth,bmpHeight,biBitCount);
//printf("newwidth = %d, newheight = %d,biBitCount = %d\n",newBmpWidth,newBmpHeight,biBitCount);
long i,j,k;
long i0,j0;
int lineByte =(bmpWidth*biBitCount/8+3)/4*4;
{
for(i = 0;i < newBmpHeight;i++) {
for(j = 0; j<newBmpWidth;j++) {//★
i0 = (long)(i/FYZOOMRATIO);
j0 = (long)(j/FXZOOMRATIO);
if((j0 >=0) && (j0 < bmpWidth) && (i0 >=0)&& (i0 <bmpHeight)) {
*(pNewBmpBuf+i*newLineByte+j) = *(pBmpBuf+i0*lineByte+j0);
} else {
*(pNewBmpBuf+i*newLineByte+j)=255;
}
}//★
}
}
saveBmp(szDstBmp,pNewBmpBuf,newBmpWidth,newBmpHeight,biBitCount,pColorTable);
delete []pBmpBuf;
delete []pNewBmpBuf;
delete []pColorTable;
return 1;
}
/***********************************************************************
*函数名称：main()
*参数 空
*返回值 空
*描述：图像变化的访问
***************************************************************************/
void main() {
char str1[80];
char str2[80];
printf("输入bmp文件名称和路径:\n");
gets(str1);
printf("输入bmp文件保存的名称和路径:\n");
gets(str2);
printf("请输入X方向的放缩比例:\n");
scanf("%f",&FXZOOMRATIO);
printf("请输入Y方向的放缩比例:\n");
scanf("%f",&FYZOOMRATIO);
bmpzoom(str1,str2);
sprintf(str1,"mspaint %s",str2);
WinExec(str1,SW_SHOW);
}
