解决vscode打开一个单片机工程文件（IAR/keil MDK）因无法找到头文件导致的结构体成员不自动补全问题。

最近一直在用vscode安装c/c++插件后编辑STM32标准库（keil MDK）项目源文件，因为我感觉vscode在代码编辑方面比keil MDK本身优秀太多。发现打开工程后，结构体变量的成员在输入“.”后不自己弹出的问题，后来查找各方资料，发现是因为有好多头文件vscode自身无法找到。现在对整个过程做一下总结。

第0步：问题现象

第一步：检查C/C++ 插件配置正确（自动补全选择默认）

第二步：鼠标右键打开工程文件

第三步：右键编辑区---》选择“命令面板”---》C/C++配置（UI）

这个时候会自动生成一个“.vscode”的文件夹，并且自动生成一个“c_cpp_properties.json”的配置文件。

第四步：修改“c_cpp_properties.json”内容：

最后一个include是解决“stdlib.h”等环境头文件无法找到问题，需要根据自己安装路径添加。

最后添加宏定义,这里我是根据另外一篇博客添加的

如何解决VS Code打开Keil项目源码文件时显示红色波浪线的问题？-CSDN博客

"STM32F10X_MD",
"USE_STDPERIPH_DRIVER",
"__CC_ARM",
"__arm__",
"__align(x)=",
"__ALIGNOF__(x)=",
"__alignof__(x)=",
"__asm(x)=",
"__forceinline=",
"__restrict=",
"__global_reg(n)=",
"__inline=",
"__int64=long long",
"__INTADDR__(expr)=0","__irq=",
"__packed=",
"__pure=",
"__smc(n)=",
"__svc(n)=",
"__svc_indirect(n)=",
"__svc_indirect_r7(n)=",
"__value_in_regs=",
"__weak=",
"__writeonly=",
"__declspec(x)=",
"__attribute__(x)=",
"__nonnull__(x)=",
"__register=",
"__breakpoint(x)=",
"__cdp(x,y,z)=",
"__clrex()=",
"__clz(x)=0U",
"__current_pc()=0U",
"__current_sp()=0U",
"__disable_fiq()=",
"__disable_irq()=",
"__dmb(x)=",
"__dsb(x)=",
"__enable_fiq()=",
"__enable_irq()=",
"__fabs(x)=0.0",
"__fabsf(x)=0.0f",
"__force_loads()=",
"__force_stores()=",
"__isb(x)=",
"__ldrex(x)=0U",
"__ldrexd(x)=0U",
"__ldrt(x)=0U",
"__memory_changed()=",
"__nop()=",
"__pld(...)=",
"__pli(...)=",
"__qadd(x,y)=0",
"__qdbl(x)=0",
"__qsub(x,y)=0",
"__rbit(x)=0U",
"__rev(x)=0U",
"__return_address()=0U",
"__ror(x,y)=0U",
"__schedule_barrier()=",
"__semihost(x,y)=0",
"__sev()=",
"__sqrt(x)=0.0",
"__sqrtf(x)=0.0f",
"__ssat(x,y)=0",
"__strex(x,y)=0U",
"__strexd(x,y)=0",
"__strt(x,y)=",
"__swp(x,y)=0U",
"__usat(x,y)=0U",
"__wfe()=",
"__wfi()=",
"__yield()=",
"__vfp_status(x,y)=0"

需要注意的是：第一个第二个宏定义需要与keil MDK或这IAR中设置保持一致。下图是我用的标准库以及使用了stm32f103c8t6单片机。所以需要定义宏“STM32F10X_MD”,"USE_STDPERIPH_DRIVER"。

最终版的c_cpp_properities.json文件如下：

{"configurations": [{"name": "Win32","includePath": ["${workspaceFolder}/**","D:\\Program Files (x86)\\MDK\\ARM\\ARMCC\\include"],"defines": ["STM32F10X_MD","USE_STDPERIPH_DRIVER","__CC_ARM","__arm__","__align(x)=","__ALIGNOF__(x)=","__alignof__(x)=","__asm(x)=","__forceinline=","__restrict=","__global_reg(n)=","__inline=","__int64=long long","__INTADDR__(expr)=0","__irq=","__packed=","__pure=","__smc(n)=","__svc(n)=","__svc_indirect(n)=","__svc_indirect_r7(n)=","__value_in_regs=","__weak=","__writeonly=","__declspec(x)=","__attribute__(x)=","__nonnull__(x)=","__register=","__breakpoint(x)=","__cdp(x,y,z)=","__clrex()=","__clz(x)=0U","__current_pc()=0U","__current_sp()=0U","__disable_fiq()=","__disable_irq()=","__dmb(x)=","__dsb(x)=","__enable_fiq()=","__enable_irq()=","__fabs(x)=0.0","__fabsf(x)=0.0f","__force_loads()=","__force_stores()=","__isb(x)=","__ldrex(x)=0U","__ldrexd(x)=0U","__ldrt(x)=0U","__memory_changed()=","__nop()=","__pld(...)=","__pli(...)=","__qadd(x,y)=0","__qdbl(x)=0","__qsub(x,y)=0","__rbit(x)=0U","__rev(x)=0U","__return_address()=0U","__ror(x,y)=0U","__schedule_barrier()=","__semihost(x,y)=0","__sev()=","__sqrt(x)=0.0","__sqrtf(x)=0.0f","__ssat(x,y)=0","__strex(x,y)=0U","__strexd(x,y)=0","__strt(x,y)=","__swp(x,y)=0U","__usat(x,y)=0U","__wfe()=","__wfi()=","__yield()=","__vfp_status(x,y)=0"]}],"version": 4
}

最终效果：

最后总结：其实结构体成员无法自动补全，无法打开头文件对应的是同一个问题就是vscode自身无法找到头文件的原因。通过自己创建c_cpp_properities.json可以完美解决此类问题。

补充：使用vscode打开IAR工程也是相同的做法：添加c_cpp_properties.json文件，内容基本一致。