按下触摸屏显示器时，使用Qt4.8，00000000000000000a12syzygy.sv.example.co00000192.168.234.11900000000000Quasimodo
在安装了Ubuntu 14.04的PC上激发正确的信号（#include <string.h>
#include <stdio.h>
struct Field
{
int width;
char pad;
};
static struct Field fields[] =
{
{ .width = 12, .pad = '0', },
{ .width = 30, .pad = '@', },
{ .width = 15, .pad = '.', },
{ .width = 25, .pad = '-', },
};
enum { NUM_FIELDS = sizeof(fields) / sizeof(fields[0]) };
static char *data[][4] =
{
{ "a12", "syzygy.sv.example.com", "192.168.234.119", "Quasimodo" },
{ "zzx2341", "zulu.za.example.com", "192.168.23.19", "Beowulf" },
{ "reynard", "coffee.br.example.com", "192.168.5.9", "William the Conqueror" },
{ "peanut", "koala.au.example.com", "192.168.93.12", "Quasimodo" },
};
enum { NUM_ROWS = sizeof(data) / sizeof(data[0]) };
int main(void)
{
for (int i = 0; i < NUM_ROWS; i++)
{
char buffer[1024];
char *bufptr = buffer;
size_t buflen = sizeof(buffer);
for (int j = 0; j < NUM_FIELDS; j++)
{
int nbytes = snprintf(bufptr, buflen, "[%*.*s]", fields[j].width,
fields[j].width, data[i][j]);
if ((size_t)nbytes > buflen)
{
fprintf(stderr, "Overlength: %zu required\n",
sizeof(buffer) - buflen + nbytes + 1);
return 1;
}
size_t leading_blanks = strspn(bufptr + 1, " ");
memset(bufptr + 1, fields[j].pad, leading_blanks);
bufptr += nbytes;
buflen -= nbytes;
}
printf("%s\n", buffer);
}
return 0;
}
，[000000000a12][@@@@@@@@@syzygy.sv.example.com][192.168.234.119][----------------Quasimodo]
[00000zzx2341][@@@@@@@@@@@zulu.za.example.com][..192.168.23.19][------------------Beowulf]
[00000reynard][@@@@@@@@@coffee.br.example.com][....192.168.5.9][----William the Conqueror]
[000000peanut][@@@@@@@@@@koala.au.example.com][..192.168.93.12][----------------Quasimodo]
）。
对于在运行RHEL 7.4的PC上编译的完全相同的源代码，仅返回鼠标事件。
两台PC上的dmesg 和 lsusb 命令返回相同的结果，向我显示没有驱动程序问题。
为什么RHEL在这种情况下不会返回正确的信号？我希望在RHEL PC上使用多点触控。