Windows API 之 CreateToolhelp32Snapshot

CreateToolhelp32Snapshot:

参考：

https://msdn.microsoft.com/en-us/library/ms682489%28VS.85%29.aspx

HANDLE WINAPI CreateToolhelp32Snapshot(
  _In_ DWORD dwFlags,
  _In_ DWORD th32ProcessID
);

#include <windows.h>
#include <TlHelp32.h>
#include <iostream>
#include <tchar.h>

using namespace std;


DWORD GetProcessIDByName(TCHAR *szProcName)
{
    DWORD dwProcID = 0;
    HANDLE hProcessSnap;
    PROCESSENTRY32 pe32;

    //获取系统中全部进程的快照 Take a snapshot of all processes in the system.
    //TH32CS_SNAPPROCESS:在快照中包含系统中所有的进程。
    hProcessSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
    if (INVALID_HANDLE_VALUE == hProcessSnap) 
        return(FALSE);

    pe32.dwSize = sizeof(PROCESSENTRY32);

    // 获取第一个进程的信息 Retrieve information about the first process,
    // 若获取失败则退出 and exit if unsuccessful
    if (!Process32First(hProcessSnap, &pe32))
    {
        // 清除快照 clean the snapshot object
        CloseHandle(hProcessSnap);
        cout << "!!! Failed to gather information on system processes! 
" << endl;
        return(NULL);
    }
    //匹配进程ID Matching Process ID
    do
    {
        if (!strcmp(szProcName,pe32.szExeFile))
        {
            //拷贝进程名 Copy Process Name
            cout << pe32.szExeFile << " : " << pe32.th32ProcessID  << endl;
            dwProcID = pe32.th32ProcessID;
        }
        //cout << pe32.szExeFile << endl;
    } while (Process32Next(hProcessSnap, &pe32));

    // 清除快照 clean the snapshot object
    CloseHandle(hProcessSnap);

    return dwProcID;
}

int main()
{
    TCHAR *szProcessName = "chrome.exe";
    GetProcessIDByName(szProcessName);

    system("pause");
    return 0;
}

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