error: #35: #error directive: "Please select first the target STM32F10x

用stm32f10x.h文件时的问题
    在用uvison4.x(MDK4.x)建立一个开发STM32F103的工程：test.uvproj
在工程中加入源程序main.c文件,源代码内容如下：
#include "stm32f10x.h"
int main(void)
{
  return 0;
}
编译会出现错误，使得入门者难以继续深入学习STM32。
错误提示的全部信息如下：
C:\Keil_STM32\ARM\INC\ST\STM32F10x\stm32f10x.h(80):error:  #35: #error directive: "Please selectfirst the target STM32F10x device used in your application (instm32f10x.h file)"
解决办法如下：
   右键点击工程名，选择第一个options for target ，下面选择C/C++，在define文本框中输入：
STM32F10X_MD,USE_STDPERIPH_DRIVER即可。MD根据你选择的机种更换为LD或HD

   再编译，会出现更多错误，例如： error:  #256: invalid redeclaration of type name "s32" (declared at line 470 of "C:\Keil_STM32\ARM\INC\ST\STM32F10x\stm32f10x.h") #256: invalid redeclaration of type name "sc32" (declared at line 474 of "C:\Keil_STM32\ARM\INC\ST\STM32F10x\stm32f10x.h")...... error:  #101: "RESET" has already been declared in the current scopeerror:  #101: "SET" has already been declared in the current scope......error:  #256: invalid redeclaration of type name "ErrorStatus" (declared at line 507 of "C:\Keil_STM32\ARM\INC\ST\STM32F10x\stm32f10x.h")warning:  #47-D: incompatible redefinition of macro "HSE_Value" (declared at line 511 of "C:\Keil_STM32\ARM\INC\ST\STM32F10x\stm32f10x.h")   解决办法：打开stm32f10x_conf.h文件，将第21行的“#include "stm32f10x_type.h"”注释掉，再保存stm32f10x_conf.h文件，重新编译即可。

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