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VS（visual studio）如何查看预处理后的文件？（查看宏定义展开，头文件展开等）（注意如果要运行或调试代码，要把第一步的改回来！！！！）_visual studio文件结果怎么直接在文件里面打开
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如图，右键点击项目，选择属性：
找到预处理器–>预处理到文件，选择是，点击应用
找到项目中需要查看预处理后的文件，点击编译
打开被编译文件所在文件夹
进入debug文件夹
这个main.i就是我们main.cpp文件生成的预处理文件
打开查看对比：
main.cpp
#define add(x1,x2) x1+x2
int main()
{
int x1 = 333;
add(6, x1);
return 0;
}
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main.i
#line 1 "D:\\Dontla_small_project\\20210525_address_list\\cc++list\\dynamic_address_list\\main.cpp"
int main()
{
int x1 = 333;
6+x1;
return 0;
}
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注意如果要运行或调试代码，要把第一步的改回来！！！！
参考文章：在VisualStudio中预处理后如何查看C/C+源文件？
当然如果只是单纯查看宏定义展开，直接将鼠标移动到代码上，也是可以查看的。。。。。
20230816
Visual Studio 中查看预处理后的文件
Visual Studio 提供了一种方法来查看预处理后的代码，这对于理解宏定义展开、头文件包含等过程非常有用。以下是一个详细的步骤指南，以及如何在完成后恢复设置。
目录
1. 开始
首先打开 Visual Studio，并加载需要查看预处理结果的项目。
// 示例代码
#include<iostream>
#define PI 3.14159
int main(){
std::cout << "PI: " << PI;
return 0;
}
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2. 查看预处理后的文件
要查看预处理后的文件，请按照以下步骤操作：
2.1 右键点击项目中需要查看预处理结果的文件，选择属性
此时会打开该文件的属性页。
2.2 在 C/C++ 分类下选择 Preprocessor（预处理器）
然后在右侧的 Preprocess to a File 选项中选择 Yes (/P)。
现在编译你的代码，生成预处理后的文件。预处理文件的默认名称为 原文件名.i，位于你的项目目录中。
打开生成的 .i 文件，你可以看到所有的宏定义都已经被展开，所有的 include 指令都已经被相应的头文件内容替换。
例如，上述示例代码在预处理之后可能会变为：
// 示例预处理后的代码
#include <iostream>
int main(){
std::cout << "PI: " << 3.14159;
return 0;
}
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注意：这只是一个简化的示例，实际的预处理结果可能会包含更多的代码和注释。
3. 恢复设置
完成预处理查看后，为了能够正常运行和调试代码，需要将设置恢复原状。
同样地，右键点击文件并选择属性，然后在 C/C++ 分类下选择 Preprocessor（预处理器），将 Preprocess to a File 的选项改回 No (/EP)。
现在你可以像平常一样编译、运行和调试你的代码了。
4. 参考资料
- MSDN: /P (Preprocess to a File)
- StackOverflow: How to see an expanded version of the code (with macros expanded)
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