C++：手把手教学windows下调用外部exe

参考

https://blog.csdn.net/linjingtu/article/details/53190491
https://blog.csdn.net/u012348774/article/details/60955695

目的

手把手教学windows下调用外部exe。

思路

将外部exe放在本程序同等目录下，然后利用本程序调用外部程序。

步骤

1、获取当前目录

string GetExePath(void)  
{  
    char szFilePath[MAX_PATH + 1]={0};  
    GetModuleFileNameA(NULL, szFilePath, MAX_PATH);  
    (strrchr(szFilePath, '\\'))[0] = 0; // 删除文件名，只获得路径字串  
    return szFilePath;  
}  

2、调用外部程序

    SHELLEXECUTEINFO shExecInfo = {0};
    shExecInfo.cbSize = sizeof(SHELLEXECUTEINFO);
    shExecInfo.fMask  = SEE_MASK_NOCLOSEPROCESS;
    shExecInfo.hwnd   = NULL;
    shExecInfo.lpVerb = "open";
    shExecInfo.lpFile = working_path + "demo.exe";//程序所在路径
    shExecInfo.lpParameters = "hello world";//程序运行所需的参数，通过argv传入
    shExecInfo.lpDirectory  = working_path;//程序所在文件夹
    shExecInfo.nShow        = SW_SHOW;
    shExecInfo.hInstApp     = NULL;
    ShellExecuteEx(&shExecInfo);
    //这一句是等待程序结束，再结束main函数
    WaitForSingleObject(shExecInfo.hProcess,INFINITE);

此时VS2015中会遇到错误：

CONST CHAR *转换为LPCWSTR

需要进行一下更改：

项目菜单——项目属性(最后一个)——配置属性——常规——项目默认值——字符集，将使用Unicode字符集改为未设置即可。

代码示例

//C
#include <stdio.h>  
#include <io.h>  
#include <windows.h>
#include <direct.h>
#include <shellapi.h>

string GetExePath(void)  
{  
    char szFilePath[MAX_PATH + 1]={0};  
    GetModuleFileNameA(NULL, szFilePath, MAX_PATH);  
    (strrchr(szFilePath, '\\'))[0] = 0; // 删除文件名，只获得路径字串  
    return szFilePath;  
}

int main()
{
  string working_path = GetExePath();
  string exe = working_path + "/demo.exe";
  string parameter = "hello world!";

  {
    SHELLEXECUTEINFO shExecInfo = {0};
    shExecInfo.cbSize = sizeof(SHELLEXECUTEINFO);
    shExecInfo.fMask  = SEE_MASK_NOCLOSEPROCESS;
    shExecInfo.hwnd   = NULL;
    shExecInfo.lpVerb = "open";
    shExecInfo.lpFile = working_path + "demo.exe";
    shExecInfo.lpParameters = "hello world";
    shExecInfo.lpDirectory  = working_path;
    shExecInfo.nShow        = SW_SHOW;
    shExecInfo.hInstApp     = NULL;
    ShellExecuteEx(&shExecInfo);
    //这一句是等待程序结束，再结束main函数
    WaitForSingleObject(shExecInfo.hProcess,INFINITE);
  }

  return 0;
}