从Windows中生成子流程获取返回值的方法是什么?看起来ShellExecute()
比CreateProcess()
更容易使用,但是从我到目前为止所做的阅读来看,它们都没有说明如何检查衍生过程的返回值。怎么做的?
谢谢, 安迪
答案 0 :(得分:22)
要在Windows上获取流程的退出代码,您可以使用GetExitCodeProcess()
。
示例应用程序接受进程id作为参数,等待五秒钟完成,然后获取其退出代码:
int main(int a_argc, char** a_argv)
{
int pid = atoi(*(a_argv + 1));
HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION, FALSE, pid);
if (NULL != h)
{
WaitForSingleObject(h, 5000); // Change to 'INFINITE' wait if req'd
DWORD exit_code;
if (FALSE == GetExitCodeProcess(h, &exit_code))
{
std::cerr << "GetExitCodeProcess() failure: " <<
GetLastError() << "\n";
}
else if (STILL_ACTIVE == exit_code)
{
std::cout << "Still running\n";
}
else
{
std::cout << "exit code=" << exit_code << "\n";
}
CloseHandle(h);
}
else
{
std::cerr << "OpenProcess() failure: " << GetLastError() << "\n";
}
return 0;
}
答案 1 :(得分:5)
以下是基于http://msdn.microsoft.com/en-us/library/windows/desktop/ms682512%28v=vs.85%29.aspx的完整代码和hmjd:
的解决方案#include <stdio.h>
#include <Windows.h>
int main()
{
const size_t stringSize = 1000;
STARTUPINFO si;
PROCESS_INFORMATION pi;
DWORD exit_code;
char commandLine[stringSize] = "C:\\myDir\\someExecutable.exe param1 param2";
WCHAR wCommandLine[stringSize];
mbstowcs (wCommandLine, commandLine, stringSize);
ZeroMemory( &si, sizeof(si) );
si.cb = sizeof(si);
ZeroMemory( &pi, sizeof(pi) );
// Start the child process.
if( !CreateProcess( NULL, // No module name (use command line)
wCommandLine, // Command line
NULL, // Process handle not inheritable
NULL, // Thread handle not inheritable
FALSE, // Set handle inheritance to FALSE
0, // No creation flags
NULL, // Use parent's environment block
NULL, // Use parent's starting directory
&si, // Pointer to STARTUPINFO structure
&pi ) // Pointer to PROCESS_INFORMATION structure
)
{
printf("CreateProcess failed (%d).\n", GetLastError() );
return -1;
}
// Wait until child process exits.
WaitForSingleObject( pi.hProcess, INFINITE );
GetExitCodeProcess(pi.hProcess, &exit_code);
printf("the execution of: \"%s\"\nreturns: %d\n", commandLine, exit_code);
// Close process and thread handles.
CloseHandle( pi.hProcess );
CloseHandle( pi.hThread );
return 0;
}
(在Windows XP中作为VS2005控制台应用程序运行)