CreateProcess调用cmd.exe，包括 没有显示（闪烁）窗口的参数？

Question

The saga continues...

I've searched the web, i've searched on StackOverflow, i found many hope giving answers/solutions, but somehow they have all failed (up)on me (including the ones related to ShellExecute(Ex) ).

How to hide a (flashing) CMD window (incl. arguments) using CreateProcess??

I basically want to call/execute a set of conditional/native cmd.exe commands (ie FOR /F , and || ), but also an external command FIND(STR).exe . And this, without showing a (flashing) CMD window.

But even hiding something as simple as "cmd.exe /C ECHO ...flashing window is bad..." seems impossible to do.

The code i've tried (including many variations related to the dwFlags and wShowWindow flags

#include <windows.h>

int main()


{

    char cmdline[] = "cmd.exe /c ECHO ...flashing window is bad...";

    PROCESS_INFORMATION pi;
    STARTUPINFO si;

//  memset(&si,0,sizeof(STARTUPINFO));
    ZeroMemory(&si, sizeof(STARTUPINFO));
    si.cb = sizeof(STARTUPINFO);

//  si.dwFlags = STARTF_USESTDHANDLES;
//  si.dwFlags = CREATE_NO_WINDOW;
    si.dwFlags = STARTF_USESHOWWINDOW;
    si.wShowWindow = SW_HIDE;
//  si.wShowWindow = CREATE_NO_WINDOW;

    CreateProcess(NULL, (LPSTR) cmdline, NULL, NULL, 0, 0, NULL, NULL, &si, &pi);

    WaitForSingleObject(pi.hProcess, INFINITE);

    CloseHandle(pi.hThread);
    CloseHandle(pi.hProcess);

//  ExitProcess;

    return 0;

}

I don't want to rely on external programs ie .vbs (Windows Scripting Host) or shortcut tricks, but simply a standalone compiled .exe.

Is this (really) too much to ask, or am i doing it (completely) wrong?

Thanks...

Answer 1

Update: You also seem to confuse CreateProcess flags (its dwCreationFlags argument) with the member of STARTUPINFO structure. These are different flags, CREATE_NO_WINDOW should not be in STARTUPINFO .

You have to pass the CREATE_NO_WINDOW flag, then the console window won't show. Originally I've answered that you have to redirect the standard handles which is not correct (but still highly recommanded).

Set STARTF_USESTDHANDLES and fill in appropriate handles. If you are interested in the output of the process, create pipes, otherwise you can just open nul an pass that.

Answer 2

Try Using ProcessBuilder. Here is an example of some code that I have that seems to work just fine. In my code below, the shellScript is a StringBuilder that I am dynamically creating that contains the command and it's parameters that I want to execute.

String[] scriptArray = shellScript.toString().split(" ");

ProcessBuilder builder = new ProcessBuilder(scriptArray);
File outputFile = new File("/logs/AgentOutputLog.txt");
File errorFile = new File("/logs/AgentErrorLog.txt");
builder.redirectOutput(outputFile);
builder.redirectError(errorFile);
Process process = builder.start();
int errCode = process.waitFor();

//errCode = 0 means online
if(errCode == 0){
    success = true;
    break;
//errCode = 1 means offline
} else if (errCode == 1){
    success = false;
    break;
}