#define BMP_Header_Length 54
// 写入bmp文件（24位）
int save_bmp_image(int w, int h, unsigned char *pdata, char *BmpFileName, int IsRGBA )
{int ret = 0;unsigned char header[BMP_Header_Length] = {0x42, 0x4d, 0, 0, 0, 0, 0, 0, 0, 0,54, 0, 0, 0, 40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, IsRGBA ? 32 : 24, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0};long file_size = (long)w * (long)h * (IsRGBA ? 4 : 3) + 54;header[2] = (unsigned char)(file_size &0x000000ff);header[3] = (file_size >> 8) & 0x000000ff;header[4] = (file_size >> 16) & 0x000000ff;header[5] = (file_size >> 24) & 0x000000ff;long width = w;header[18] = width & 0x000000ff;header[19] = (width >> 8) &0x000000ff;header[20] = (width >> 16) &0x000000ff;header[21] = (width >> 24) &0x000000ff;long height = h;header[22] = height &0x000000ff;header[23] = (height >> 8) &0x000000ff;header[24] = (height >> 16) &0x000000ff;header[25] = (height >> 24) &0x000000ff;FILE *pWritingFile = NULL;pWritingFile = fopen(BmpFileName, "wb"); if( pWritingFile == NULL ){printf("-----------%s:%d-------------- fopen failed-!\n", __FUNCTION__, __LINE__);return -1;}ret = fwrite(header, sizeof(unsigned char), 54, pWritingFile);if(ret < 0){printf("-----------%s:%d---ret %d---- fwrite header failed-!\n", __FUNCTION__, __LINE__, ret);return -1;}int BytesPerPixel = IsRGBA ? 4 : 3;int LineLength, TotalLength; LineLength = w * BytesPerPixel; // 每行数据长度大致为图象宽度乘以 // 每像素的字节数 while( LineLength % 4 != 0 ) // 修正LineLength使其为4的倍数 ++LineLength; TotalLength = LineLength * h; // 数据总长 = 每行长度 * 图象高度ret = fwrite(pdata, sizeof(unsigned char), (size_t)(long)TotalLength, pWritingFile);if(ret < 0){printf("-----------%s:%d---ret %d---- fwrite data failed-!\n", __FUNCTION__, __LINE__, ret);return -1;}// 释放内存和关闭文件 fclose(pWritingFile); return 0;
}