BMP.zip_C++源码_C++读入bmp_打开保存BMP文件

#include <stdio.h> #include <Windows.h> // /*********************************************** 功能： 读位图文件 参数： char * 为位图文件的路径 ****************************************************/ int readBmp(char *); /********************************************************************************************************* 功能： 保存位图 参数： char *bmpPath 位图的路径（或文件名） char *pImgBuf 位图的数据 int bmpWidth 位图的宽，以像素为单位 int bmpHeight 位图的高，以像素为单位 int biBitCount位图每个像素占的字节数 RGBQUAD *pColorTable位图的颜色表 ***********************************************************************************************************/ int saveBmp(char *bmpPath,unsigned char *pImgBuf, int bmpWidth, int bmpHeight, int biBitCount, RGBQUAD *pColorTable); /*************************************************************** 功能： 将图像数据左下角1/4部分置成黑色 参数： unsigned char *pImgData 图像数据 int biWidth 图像的宽，以像素为单位 int biHeight 图像的高，以像素为单位 int biBitCount 图像的每个像素占的位数 返回值：return 0； 失败返回0 return 1； 成功返回1 *****************************************************************/ int changeLeftBottomToBlack(unsigned char *pImgData,int biWidth,int biHeight, int biBitCount); unsigned char *gpImgBuf; //保存位图数据 RGBQUAD *gpColorTable; //颜色表指针 int gwidth; //保存位图的宽，以像素为单位 int gheight; //保存位图的高，以像素为单位 int gbiBitCount; //位图的每个像素占的位数（即占几个bit） void main() { char bmpPath[] = "dog.bmp"; if (!readBmp(bmpPath)) return; //changeLeftBottomToBlack(gpImgBuf, gwidth, gheight, gbiBitCount); if (!saveBmp("dogcpy.bmp", gpImgBuf, gwidth, gheight, gbiBitCount, gpColorTable)) { MessageBox(NULL, "保存文件失败", "提示", MB_OK); } if (8 == gbiBitCount) delete[]gpColorTable; delete[]gpImgBuf; } int readBmp(char *bmpPath) { //1以二进制读方式打开文件 FILE *fp; errno_t err; // Open for read (will fail if file "crt_fopen_s.c" does not exist) err = fopen_s(&fp, bmpPath, "rb"); if (err == 0) { printf("The file 'crt_fopen_s.c' was opened\n"); } else { printf("The file 'crt_fopen_s.c' was not opened\n"); } //跳过文件头，因为其包含的信息，读出来对我们没有意义 fseek(fp, sizeof(BITMAPFILEHEADER), SEEK_CUR); //定义位图信息头 BITMAPINFOHEADER infoHeader; fread(&infoHeader, sizeof(BITMAPINFOHEADER), 1, fp); gwidth = infoHeader.biWidth; gheight = infoHeader.biHeight; gbiBitCount = infoHeader.biBitCount; //如果是灰度图像，读取颜色表 if (8 == infoHeader.biBitCount) { gpColorTable = new RGBQUAD[256]; fread(gpColorTable, sizeof(RGBQUAD), 256, fp); } //计算位图中每行像素所占的字节数（必须是4个字节的整数倍） int lineByte = (gbiBitCount*gwidth / 8 + 3) / 4 * 4; gpImgBuf = new unsigned char[lineByte*gheight]; //读取位图数据 fread(gpImgBuf, 1, lineByte*gheight, fp); if (fclose(fp) != 0) { MessageBox(NULL, "读取文件时关闭文件失败", "提示", MB_OK); return 0; } //返回1代表成功读取文件 return 1; } int saveBmp(char *bmpPath,unsigned char *pImgBuf, int bmpWidth, int bmpHeight, int biBitCount, RGBQUAD *pColorTable) { FILE *fp; errno_t err; // Open for write err = fopen_s(&fp, bmpPath, "wb"); if (err == 0) { printf("The file 'data2' was opened\n"); } else { printf("The file 'data2' was not opened\n"); } //求出颜色表的长度，以字节为单位 int colorTableSize = 0; if (8 == biBitCount) { colorTableSize = 1024; } //求出每行像素所占的字节数（必须为4个字节的整数倍） int lineByte = (biBitCount*bmpWidth / 8 + 3) / 4 * 4; //初始化位图文件头对象 BITMAPFILEHEADER fileHeader; fileHeader.bfReserved1 = 0; fileHeader.bfReserved2 = 0; fileHeader.bfOffBits = 54 + colorTableSize; fileHeader.bfSize = 54 + colorTableSize + lineByte*bmpHeight;//strlen(pImgBuf); fileHeader.bfType = 0x4D42; //初始化位图信息头对象 BITMAPINFOHEADER infoHeader; infoHeader.biBitCount = biBitCount; infoHeader.biClrImportant = 0; infoHeader.biClrUsed = 0; infoHeader.biCompression = BI_RGB; infoHeader.biHeight = bmpHeight; infoHeader.biPlanes = 1; infoHeader.biSize = 40; infoHeader.biSizeImage = 0; infoHeader.biWidth = bmpWidth; infoHeader.biXPelsPerMeter = 0; infoHeader.biYPelsPerMeter = 0; //写位图文件头和位图信息头 fwrite(&fileHeader, sizeof(BITMAPFILEHEADER), 1, fp); fwrite(&infoHeader, sizeof(BITMAPINFOHEADER), 1, fp); //写颜色表 if (8 == biBitCount) { fwrite(pColorTable, colorTableSize, 1, fp); } fwrite(pImgBuf, 1, lineByte*bmpHeight, fp); if (fclose(fp) != 0) { MessageBox(NULL, "写入文件时关闭文件失败", "提示", MB_OK); //返回0表示以写方式写入位图失败 return 0; } //返回1表示成功保存位图 return 1; } int changeLeftBottomToBlack(unsigned char *pImgData, int biWidth, int biHeight,int biBitCount) { if (pImgData == NULL) return 0; //For uncompressed RGB bitmaps, if biHeight is positive, the bitmap is a bottom - up DIB with the origin at the lower left corner. if (biHeight > 0) { //计算每行像素占的字节数 int lineByte = (biWidth*biBitCount / 8 + 3) / 4 * 4; //灰度图像 if (8 == biBitCount) { for (int i = 0; i < (biHeight / 2); i++) { for (int j = 0; j < (biWidth / 2); j++) { *(pImgData + i*lineByte + j) = 0; } } return 1; } //彩色图像 for (int i = 0; i < biHeight / 2; i++) { for (int j = 0; j < biWidth / 2; j++) { *(pImgData + i*lineByte + j * 3) = 0;//B *(pImgData + i*lineByte + j * 3 + 1) = 0;//G *(pImgData + i*lineByte + j * 3 + 2) = 0;//R } } // return 1; } //If biHeight is negative, the bitmap is a top - down DIB with the origin at the upper left corner else { ::MessageBox(NULL, "the case of the biHeight is negative is not implemeted", "warning", MB_OK); } }