编制读入并显示bmp的程序

/**
BMP文件格式，又称为Bitmap（位图）或是DIB(Device-Independent Device，设备无关位图)，
是Windows系统中广泛使用的图像文件格式。由于它可以不作任何变换地保存图像像素域的数据，
因此成为我们取得RAW数据的重要来源。
Windows的图形用户界面（graphical user interfaces）也在它的内建图像子系统GDI中对BMP格式提供了支持。
**/
/*一套BMP文字的图片，想把BMP转化为字库，需要去掉BMP的头和BMP信息，只取数据部分，并存为数组*/

#include 
#include 
#include 
#include 
#include 
using namespace std;

 int Save8bitBmp(const char* FileName, unsigned char* img, int width, int height, int lineByte, RGBQUAD* rgb);
 int Load8bitBmp(const char* FileName, int &width, int &height)
 {
 	FILE* fp = fopen(FileName, "rb");
 	if(fp == NULL)
 	{
 		printf("open file error\n");
 		return 0;
 	}
 	
 	BITMAPFILEHEADER FileHeader;
 	//fread函数的原型是size_t fread ( void *buffer, size_t size, size_t count, FILE *stream) ;  从文件中一次最多读count项，每个项size字节，保存到buffer中 
 	if(fread(&FileHeader, sizeof(BITMAPFILEHEADER), 1, fp) != 1)
 	{
 		printf("read file error\n");
 		return 0;
	} 
	if (FileHeader.bfType != 0x4d42)
	{
		printf("no bmp file\n");
		return 0;
	}
	BITMAPINFOHEADER InfoHeader;
	if(fread(&InfoHeader, sizeof(BITMAPINFOHEADER), 1, fp) != 1)
	{
		printf("read file2 error\n");
		return 0;
	}
	if(InfoHeader.biBitCount != 8)
	{
		printf("this is not 8 bit bmp file\n");
		return 0;
	}
	if(InfoHeader.biCompression != 0)
	{
		printf("compression mode\n");
		return 0;
	}
	RGBQUAD rgb[256];
	int i;
	for(i = 0; i < 256; i++)
	{
		rgb[i].rgbBlue = rgb[i].rgbGreen = rgb[i].rgbRed = i;
		rgb[i].rgbReserved = 0;
	}
	width = InfoHeader.biWidth;
	height = InfoHeader.biHeight;
	unsigned char* img = (unsigned char *) malloc(width * height); 
	//SEEK_SET：文件开头  int fseek(FILE *stream, long offset, int fromwhere);  把指针移动到离fromwhere处的offset字节处 
	fseek(fp, FileHeader.bfOffBits, SEEK_SET);
	 
	for(int i = height-1; i>=0 ;i--)
	{
		if(fread(img+i*width,width, 1, fp) != 1)
		{
			printf("read file error\n");
			return 0;
		} 
		if(width %4 != 0)
			fseek(fp, 4-width % 4, SEEK_CUR);
	} 
	Save8bitBmp("E:\\newcopy.bmp",img, width, height, 0, rgb);
	free(img);
	fclose(fp);
	printf("success Load8bitBmp\n");
	return 1;
 }
 int Save8bitBmp(const char* FileName, unsigned char* img, int width, int height, int lineByte, RGBQUAD* rgb)
 {
 	FILE* fp = fopen(FileName, "wb");
 	if(fp == NULL)
 	{
 		printf("open file error\n");
 		return 0;
 	}
 	DWORD bfSize = (width +3) /4 * 4 * height +54 + 256 * 4; //bmp文件的大小
	BITMAPFILEHEADER FileHeader = { 0x4d42, bfSize, 0, 0, 54 + 256 * 4 }; 
	if(fwrite(&FileHeader, sizeof(BITMAPFILEHEADER), 1, fp) != 1)
	{
		printf("write filehead error\n");
		return 0;
	} 
	BITMAPINFOHEADER   InfoHeader =
	{ 40, width  , height, 1, 8, 0, 0, 0, 0, 0, 0 };
	if (fwrite(&InfoHeader, sizeof(BITMAPINFOHEADER), 1, fp) != 1)
	{
		printf("write file error\n");
		return 0;
	}

	if (fwrite(rgb, sizeof(RGBQUAD), 256, fp) != 256)
	{
		printf("read rgb error\n");
		return 0;
	}

	BYTE blank[3] = { 0,0,0 };
	for (int i = height - 1; i >= 0; i--)
	{
		if (fwrite(img + i * width, width, 1, fp) != 1)
		{
			cout << "write file error" << endl;
			return 0;
		}
		if (width % 4 != 0)
			fwrite(blank, 4 - width % 4, 1, fp);
	}

	system("pause");
	fclose(fp);
	printf("success Save8bitBmp\n");
	return 1;
	
 }
int main()
{
	int width = 0;
	int height = 0;
	Load8bitBmp("E:\\woman.bmp",  width, height);

}

 

 

我使用的图片是