andreteprom wrote: Is there any code example in C++ for HID programming ?
Yes, there are code examples available for HID programming in C++. HID (Human Interface Device) programming can be done using various platforms such as Windows, Linux, and macOS. Here is an example code for HID programming in C++ on Windows using the WinUSB API:
```
#include <Windows.h>
#include <stdio.h>
#define VID 0x1234
#define PID 0x5678
#define MAX_REPORT_SIZE 64
int main() {
HANDLE deviceHandle;
BOOL readResult, writeResult;
DWORD bytesWritten, bytesRead;
BYTE reportInput[MAX_REPORT_SIZE], reportOutput[MAX_REPORT_SIZE];
reportInput[0] = 0x00; // Fill the report with some data
HDEVINFO deviceInfoSet;
SP_DEVICE_INTERFACE_DATA deviceInterfaceData;
deviceInterfaceData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
// Get device information set for all HID devices
deviceInfoSet = SetupDiGetClassDevs(&GUID_DEVINTERFACE_HID, NULL, NULL, DIGCF_DEVICEINTERFACE | DIGCF_PRESENT);
// Iterate through all the devices
while (SetupDiEnumDeviceInterfaces(deviceInfoSet, NULL, &GUID_DEVINTERFACE_HID, 0, &deviceInterfaceData)) {
DWORD requiredSize;
// Get device interface detail
SetupDiGetDeviceInterfaceDetail(deviceInfoSet, &deviceInterfaceData, NULL, 0, &requiredSize, NULL);
PSP_DEVICE_INTERFACE_DETAIL_DATA deviceInterfaceDetailData = (PSP_DEVICE_INTERFACE_DETAIL_DATA)malloc(requiredSize);
deviceInterfaceDetailData->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);
SetupDiGetDeviceInterfaceDetail(deviceInfoSet, &deviceInterfaceData, deviceInterfaceDetailData, requiredSize, NULL, NULL);
// Get device handle with WinUSB interface
deviceHandle = CreateFile(deviceInterfaceDetailData->DevicePath, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);
if (deviceHandle == INVALID_HANDLE_VALUE) {
printf("Error opening device.\n");
continue;
}
// Get device descriptor
HIDD_ATTRIBUTES attributes;
attributes.Size = sizeof(attributes);
HidD_GetAttributes(deviceHandle, &attributes);
if (attributes.VendorID != VID || attributes.ProductID != PID) {
CloseHandle(deviceHandle);
continue;
}
// Set input report size
HidD_SetNumInputBuffers(deviceHandle, 2);
// Read input report
readResult = ReadFile(deviceHandle, reportInput, MAX_REPORT_SIZE, &bytesRead, NULL);
if (!readResult) {
printf("Error reading input report.\n");
continue;
}
// Write output report
writeResult = WriteFile(deviceHandle, reportOutput, MAX_REPORT_SIZE, &bytesWritten, NULL);
if (!writeResult) {
printf("Error writing output report.\n");
continue;
}
// Close device handle
CloseHandle(deviceHandle);
}
// Free device information set
SetupDiDestroyDeviceInfoList(deviceInfoSet);
return 0;
}
```
This code opens a handle to each HID device and checks for a specific VID and PID to match the device of interest. It then sets the input report size, reads an input report, and writes an output report. Note that this code uses the WinUSB API for communication with HID devices on Windows, but other APIs such as hidapi can also be used.
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