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In python with pywin32, win32job, the CreateJobObject function, how do I pass NULL for the name parameter?


In python with pywin32, win32job, the CreateJobObject function, how do I pass NULL for the name parameter?

By : Luan Simões
Date : October 17 2020, 01:08 AM
it fixes the issue You can use win32job.CreateJobObject(None, ""). Although it isn't specified on [MS.Docs]: CreateJobObjectA function, the empty string acts just like NULL.
According to the link above:
code :
#include <Windows.h>
#include <stdio.h>

#define EMPTY_TEXT ""
#define DUMMY0_TEXT "dummy0"
#define DUMMY1_TEXT "dummy1"

#define DIM 12

int main() {
    char* names[DIM] = { NULL, NULL, EMPTY_TEXT, EMPTY_TEXT, DUMMY0_TEXT,
                         DUMMY0_TEXT, EMPTY_TEXT, DUMMY0_TEXT, DUMMY1_TEXT,
                         NULL, DUMMY0_TEXT, DUMMY1_TEXT };
    HANDLE jobs[DIM] = { NULL };
    for (int i = 0; i < DIM; i++) {
        jobs[i] = CreateJobObjectA(NULL, names[i]);
        printf("%02d [%6s] CreateJobObject: %08X - GetLastError: %d\n", i, names[i], (long)jobs[i], GetLastError());
    }
    for (int i = 0; i < DIM; i++)
        CloseHandle(jobs[i]);
    return 0;
}
00 [(null)] CreateJobObject: 000000D8 - GetLastError: 0
01 [(null)] CreateJobObject: 000000E0 - GetLastError: 0
02 [      ] CreateJobObject: 00000088 - GetLastError: 0
03 [      ] CreateJobObject: 000000F0 - GetLastError: 0
04 [dummy0] CreateJobObject: 000000F4 - GetLastError: 0
05 [dummy0] CreateJobObject: 000000F8 - GetLastError: 183
06 [      ] CreateJobObject: 000000E8 - GetLastError: 0
07 [dummy0] CreateJobObject: 000000FC - GetLastError: 183
08 [dummy1] CreateJobObject: 00000100 - GetLastError: 0
09 [(null)] CreateJobObject: 000000DC - GetLastError: 0
10 [dummy0] CreateJobObject: 000000E4 - GetLastError: 183
11 [dummy1] CreateJobObject: 00000104 - GetLastError: 183
#!/usr/bin/env python3

import win32job
import win32api

DUMMY0 = "dummy00"
DUMMY1 = "dummy11"

JOB_NAMES = ["", "", DUMMY0, DUMMY0, "", DUMMY1, DUMMY0, "", DUMMY1]

if __name__ == "__main__":
    handles = list()
    for i, name in enumerate(JOB_NAMES):
        h = win32job.CreateJobObject(None, name)
        print("{} [{:10}] {} - GetLastError: {}".format(i, name, h, win32api.GetLastError()))
        handles.append(h)

    for h in handles:
        win32api.CloseHandle(h)
(py35x64_test) e:\Work\Dev\StackOverflow\q046800142>"c:\Work\Dev\VEnvs\py35x64_test\Scripts\python.exe" code.py
0 [          ] <PyHANDLE:300> - GetLastError: 0
1 [          ] <PyHANDLE:308> - GetLastError: 0
2 [dummy00   ] <PyHANDLE:580> - GetLastError: 0
3 [dummy00   ] <PyHANDLE:584> - GetLastError: 183
4 [          ] <PyHANDLE:588> - GetLastError: 0
5 [dummy11   ] <PyHANDLE:592> - GetLastError: 0
6 [dummy00   ] <PyHANDLE:596> - GetLastError: 183
7 [          ] <PyHANDLE:600> - GetLastError: 0
8 [dummy11   ] <PyHANDLE:604> - GetLastError: 183


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Task scheduler won't run python script (pywin32) to open Excel. How to get more info from Pywin32

Task scheduler won't run python script (pywin32) to open Excel. How to get more info from Pywin32


By : Shen Pan
Date : March 29 2020, 07:55 AM
This might help you After several days of searching I found the following solution (the full thread can be found at http://social.msdn.microsoft.com/Forums/en/innovateonoffice/thread/b81a3c4e-62db-488b-af06-44421818ef91)
It would appear that a Desktop folder seems to be necessary in the systemprofile folder to open file by Excel. You need to create one of these folders:
How do you pass in null values for Number in a function parameter?

How do you pass in null values for Number in a function parameter?


By : Yvh.G
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , If you call your function without passing parameters, you should get the default value as you expect. In your example, the default value is only used if a value is not passed at all.
code :
function myFunction(value:Number = .5, value2:Number = .6):Number {
   return value;
}

var result = myFunction();
trace( result ) // 0.5
How should I pass NULL to the va_list function parameter?

How should I pass NULL to the va_list function parameter?


By : Ali Yildiz
Date : March 29 2020, 07:55 AM
With these it helps I assume your code will work if you just use an empty va_list instead of NULL.
code :
CCMenuItemToggle::initWithTarget( this, menu_selector(GOSound::toggleButtonCallback)
                                , NULL, va_list() );
va_list empty_va_list = va_list();
CCMenuItemToggle::initWithTarget( this, menu_selector(GOSound::toggleButtonCallback)
                                , NULL, empty_va_list );
pass a function parameter value NULL in c

pass a function parameter value NULL in c


By : Muhammad X Dapi
Date : March 29 2020, 07:55 AM
it fixes the issue What you want instead of passing in null, is to pass in a pointer to a pointer. Your function signature should look like this:
code :
int splitarr(int *array, int ogsize, int size1, int **arr1, int **arr2);
int splitarr(int *array, int ogsize, int size1, int **arr1, int **arr2) {
    int* a1 = malloc(size1 * sizeof(int));
    int* a2 = malloc((ogsize - size1) * sizeof(int));
    // perform some copying operations here
    *arr1 = a1;
    *arr2 = a2;
}
int *resultOfSplit1;
int *resultOfSplit2;
splitarr(originalArr, originalSize, size1, &resultOfSplit1, &resultOfSplit2);
CGO, how to pass NULL parameter to C function

CGO, how to pass NULL parameter to C function


By : Michael L
Date : March 29 2020, 07:55 AM
may help you . If you want to pass NULL to a C function you could simply pass nil into it.
However it's not documented what happens when you send a NULL pointer to the function strcmp(...). I'd guess that the strcmp fails when you are passing NULL to it. It would be better to check your input on before hand and return an error when one of your inputs is set to nil.
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