使用UNICODE字符集的时候，MSDN有如此描述：
BOOL WINAPI CreateProcess( _In_opt_ LPCTSTR lpApplicationName, _Inout_opt_ LPTSTR lpCommandLine, _In_opt_ LPSECURITY_ATTRIBUTES lpProcessAttributes, _In_opt_ LPSECURITY_ATTRIBUTES lpThreadAttributes, _In_ BOOL bInheritHandles, _In_ DWORD dwCreationFlags, _In_opt_ LPVOID lpEnvironment, _In_opt_ LPCTSTR lpCurrentDirectory, _In_ LPSTARTUPINFO lpStartupInfo, _Out_ LPPROCESS_INFORMATION lpProcessInformation );
The Unicode version of this function, CreateProcessW, can modify the contents of this string. Therefore, this parameter cannot be a pointer to read-only memory (such as a const variable or a literal string). If this parameter is a constant string, the function may cause an access violation.
lpCommandLine要传入可修改的内存。
如
wchar_t cmdline[] = L"/c ping localhost > d:\pingres.log";
if (!CreateProcess(L"c:\\windows\\system32\\cmd.exe", cmdline
,NULL,NULL,TRUE,NULL,NULL,NULL,&si,&pi)) {
MessageBox(L"Error on CreateProcess()");
return;
}