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Jan 6, 2022
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Update nf-winuser-getrawinputdevicelist.md #1019

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Update nf-winuser-getrawinputdevicelist.md
DJm00n Jan 6, 2022
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Update nf-winuser-getrawinputdevicelist.md
DJm00n Jan 6, 2022
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24 changes: 18 additions & 6 deletions sdk-api-src/content/winuser/nf-winuser-getrawinputdevicelist.md
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Expand Up @@ -101,13 +101,25 @@ To get more detailed information about the attached devices, call <a href="/wind
The following sample code shows a typical call to <b>GetRawInputDeviceList</b>:


```
UINT nDevices;
```cpp
UINT nDevices, nStored, i;
PRAWINPUTDEVICELIST pRawInputDeviceList;
if (GetRawInputDeviceList(NULL, &nDevices, sizeof(RAWINPUTDEVICELIST)) != 0) { Error();}
if ((pRawInputDeviceList = malloc(sizeof(RAWINPUTDEVICELIST) * nDevices)) == NULL) {Error();}
if (GetRawInputDeviceList(pRawInputDeviceList, &nDevices, sizeof(RAWINPUTDEVICELIST)) == (<dtype rid="UINT"/>)-1) {Error();}
// do the job...
if (GetRawInputDeviceList(NULL, &nDevices, sizeof(RAWINPUTDEVICELIST)) != 0) { Error(); }

// The list of devices can change between calls to GetRawInputDeviceList,
// so call it again if the function returns ERROR_INSUFFICIENT_BUFFER
do
{
if ((pRawInputDeviceList = realloc(sizeof(RAWINPUTDEVICELIST) * nDevices)) == NULL) { Error(); }
nStored = GetRawInputDeviceList(pRawInputDeviceList, &nDevices, sizeof(RAWINPUTDEVICELIST));
} while (nStored == (UINT)-1) && GetLastError() == ERROR_INSUFFICIENT_BUFFER);

if (nStored == (UINT)-1) { Error(); }

for (i = 0; i < nStored; ++i)
{
// do the job with each pRawInputDeviceList[i] element...
}

// after the job, free the RAWINPUTDEVICELIST
free(pRawInputDeviceList);
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