调用其它程序
WinExec
原型:
UINT WinExec(
  LPCSTR lpCmdLine,  // address of command line
  UINT uCmdShow      // window style for new application
);
用于十六位操作系统及兼容系统.
例如:
WinExec("notepad.exe f:\\调用程序.txt",SW_SHOW);
WinExec("notepad.exe ",SW_SHOW);
不同的参数用空格分开,故路径中不能有空格,而大部分程序默认是安装在"...\Program Files\...",如word,这极大的限制了WinExec的应用范围.
以上可不带路径:
1,程序所在目录.
2,当前路径.
3,系统目录,可以用GetSystemDirectory得到.
4,Windows 目录. 可以用TheGetWindowsDirectory得到. 
5,在环境变量中设置的目录.

ShellExecute
原型:
HINSTANCE ShellExecute(
    HWND hwnd,                   //父窗口句柄
    LPCTSTR lpOperation,         //操作,"open","print","explore"
    LPCTSTR lpFile,              //文件名,前面可加路径
    LPCTSTR lpParameters,        //参数
    LPCTSTR lpDirectory,         //默认文件夹
    INT nShowCmd                 //显示方式
);

打开一个应用程序
ShellExecute(this->m_hWnd,"open","calc.exe","","", SW_SHOW );
或
ShellExecute(this->m_hWnd,"open","notepad.exe","c:\MyLog.log","",SW_SHOW );

打开一个同系统程序相关连的文档
ShellExecute(this->m_hWnd,"open","c:\abc.txt","","",SW_SHOW );

激活相关程序，发送EMAIL
ShellExecute(this->m_hWnd,"open","mailto:nishinapp@yahoo.com","","", SW_SHOW );

用系统打印机打印文档
ShellExecute(this->m_hWnd,"print","c:\abc.txt","","", SW_HIDE);

lpParameters的用法示例:
一,建立一个可以接受参数的程序call.exe,添加如下代码:
BOOL CCallApp::InitInstance()
{
 int n = __argc;
 for(int i = 1 ; i < n ; i++)
  AfxMessageBox(__targv[i]);
       //__targv[0]存储的是程序的文件名
...
}
二,Alt + F7的进行Project setting, Debug -> program argurments ->"1 2 3 4 5".
如果有多个参数,用空格分开.
三,运行.
四,执行ShellExecute(NULL,NULL,"f:\\call.exe","1 2 3 4 5",NULL,SW_SHOW);

BOOL CreateProcess(
  LPCTSTR lpApplicationName,
                        
  LPTSTR lpCommandLine, 
  LPSECURITY_ATTRIBUTES lpProcessAttributes, 
  LPSECURITY_ATTRIBUTES lpThreadAttributes,  
  BOOL bInheritHandles, 
  DWORD dwCreationFlags,
  LPVOID lpEnvironment, 
  LPCTSTR lpCurrentDirectory,  
  LPSTARTUPINFO lpStartupInfo, 
  LPPROCESS_INFORMATION lpProcessInformation 
);

STARTUPINFO   startupInfo;
memset(&startupInfo,0,sizeof(STARTUPINFO));
startupInfo.cb = sizeof(STARTUPINFO);

示例:
//程序最启动时最大化 
startupInfo.dwFlags |= STARTF_USESHOWWINDOW;
startupInfo.wShowWindow = SW_SHOWMAXIMIZED;
 
//运行....exe
 PROCESS_INFORMATION ProcessInfo;
  BOOL bCreate = ::CreateProcess
        (
        "f:\\call.exe",// 1 2 3 4",
  NULL,
  NULL,
        NULL,
        FALSE,
        0,
        NULL,
        NULL,
        &startupInfo,
        &ProcessInfo); 

//等到call.exe执行完毕
WaitForSingleObject(ProcessInfo.hProcess,1000000);
MessageBox("调用程序结束!");