有没有办法用c ++旋转bmp 90度？ [英] Is there any ways to rotate a bmp 90 degrees using c++?

问题描述

我试图将一张686 * 800 bmp的照片旋转90度。

这是我的代码，它会破坏文件！

i'm trying to rotate a 686*800 bmp photo 90 degrees.
here's my code, it corrupts the file!

#include<iostream>
#include<fstream>
using namespace std;

int main()
{
    fstream flower("flower.bmp", ios::in | ios::out | ios::binary);
    flower.seekg(18,ios::beg);
    char read_arr[4];
    char read_arr1[4];
    flower.read(read_arr,4);
    flower.read(read_arr1,4);
    flower.seekg(22,ios::beg);
    flower.write(read_arr,4);
    flower.seekg(18,ios::beg);
    flower.write(read_arr1,4);

    flower.seekg(54,ios::beg);
    char temp1[3];
    char temp2[3];

int j=0;
for(int k=0;k<=800;k++)
{
    for(int i=0;i<=686;i++)
    {
        flower.seekg((54+(3*i)+(3*j)),ios::beg);
        flower.read(temp1,3);
        flower.seekg(54+800*3*(685-i),ios::beg);
        flower.write(temp1,3);

    }
    j+=686;
}
    flower.close();
}

推荐答案

正如barneyman写的那样在内存中旋转bmp是正确的解决方案。



阅读 CXImage 的优秀文章，该文章提供了大量的功能和旋转代码。在源代码中，您将找到一些旋转图像的代码。

as barneyman wrote rotating the bmp in memory is the right solution.

Read the outstanding article CXImage which provides some tons of features and also rotating code. In the sources you will find some code for rotating images.

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