参考这篇文章的讲解bitmap格式http://blog.csdn.net/pathuang68/article/details/4219681
我试了下，用了个bicount=24的bmp，最后读到一个二维数组打算用setpixel输出时发现显示不正确
去stackoverflow上问了下，得到了解答，bitmap每一row会对32bit对齐，
所有每行末尾可能有padding data，用
int rowbyte=(pixelbyte*width+3)&~3;
int skipdata=rowbyte-pixelbyte*width;（这个好聪明的算法...）
得出skipdata，末尾时跳过即可。
同时rgb在内存中存储的顺
1 #include<iostream> 2 #include<fstream> 3 #include<windows.h> 4 5 6 using namespace std; 7 8 struct BITMAPHEADER 9 { 10 unsigned short btType; 11 unsigned int bfSize; 12 unsigned short bfReserved1; 13 unsigned short bfReserved2; 14 unsigned int bfoffBits; 15 }; 16 17 //struct BITMAPINFOHEADER 18 //{ 19 // unsigned int biSize; 20 // unsigned int biWith; 21 // unsigned int biHeight; 22 // unsigned short biPlanes; 23 // unsigned short biBitCount; 24 // unsigned int biCompression; 25 // unsigned int biSizeImage; 26 // unsigned int biXPelsPerMeter; 27 // unsigned int biYPerlPerMeter; 28 // unsigned int biClrused; 29 // unsigned int biClrImportant; 30 //}; 31 // 32 //struct RGBQUAD 33 //{ 34 // char rgbBlue; 35 // char rgbGreen; 36 // char rgbRed; 37 // char rgbReserved; 38 // 39 //}; 40 int main() 41 { 42 tagBITMAPFILEHEADER bh; 43 BITMAPINFOHEADER bih; 44 char buf[3]; 45 unsigned char bmp[200][600]; 46 int width ,height; 47 ifstream fin(L"D:\美图图库\3.bmp",ios::_Nocreate|ios::binary); 48 fin.read((char*)&bh,sizeof(bh)); 49 fin.read((char*)&bih,sizeof(bih)); 50 51 52 width=bih.biWidth; 53 height=bih.biHeight; 54 HWND myconsole=GetConsoleWindow(); 55 HDC mydc=GetDC(myconsole); 56 int rowdata=(width*3+3)&~3; 57 int skipdata=rowdata-width*3; 58 char skip[4]; 59 for(int i=height;i>=1;i--) 60 { 61 for(int j=1;j<=width;j++) 62 { 63 fin.read(buf,sizeof(buf)); 64 bmp[i][j*3]=buf[0]; 65 bmp[i][j*3+1]=buf[1]; 66 bmp[i][j*3+2]=buf[2]; 67 68 } 69 fin.read(skip,skipdata); 70 } 71 for(int i=1;i<=height;i++) 72 { 73 for(int j=1;j<=width;j++) 74 { 75 76 COLORREF color; 77 color=RGB(bmp[i][j*3+2],bmp[i][j*3+1],bmp[i][j*3]); 78 SetPixel(mydc,j,i,color); 79 } 80 81 } 82 ReleaseDC(myconsole,mydc); 83 fin.close(); 84 return 0; 85 }
序从低到高是B G R的顺序，所有最后要反过来一下。