经过一整天的时间,我终于弄清楚了如何使用 Win32GetRawInputBuffer
从鼠标读取输入。
但是,我不喜欢我为每一帧创建一个新std::vector
的事实,所以我尝试std::vector<RAWINPUT> raw_inputs
成为类成员并使用相同的raw_inputs
调用GetRawInputBuffer
,期望GetRawInputBuffer
覆盖内容,而是报告输入的频率显着下降。
如果我在第一次调用{0}
后将内存归零,程序就会崩溃。
std::vector<RAWINPUT> raw_inputs; // if I make this a class member it stops after the first call
raw_inputs.resize(1024);
uint32_t raw_input_size = (uint32_t)(sizeof(RAWINPUT) * raw_inputs.size());
UINT input_count = GetRawInputBuffer(raw_inputs.data(), &raw_input_size, sizeof(RAWINPUTHEADER));
if (input_count == (UINT)-1) {
return ErrorStack(ExtraError::FAILED_TO_GET_RAW_INPUT_BUFFER, code_location, "failed to get raw input buffer", getLastError());
}
else if (input_count) {
printf("input_count = %d n", input_count);
for (uint32_t i = 0; i < input_count; i++) {
RAWINPUT& raw_input = raw_inputs[i];
if (raw_input.header.dwType == RIM_TYPEMOUSE) {
printf("%d %d n", raw_input.data.mouse.lLastX, raw_input.data.mouse.lLastY);
}
}
}
最后发现你必须在std::vector
上调用clear
方法,然后再将向量再次传递给GetRawInputBuffer
.
void calledSomeWhere()
{
static std::vector<RAWINPUT> raw_inputs;
raw_inputs.clear();
raw_inputs.resize(1024);
uint32_t raw_input_size = (uint32_t)(sizeof(RAWINPUT) * raw_inputs.size());
UINT input_count = GetRawInputBuffer(raw_inputs.data(), &raw_input_size, sizeof(RAWINPUTHEADER));
if (input_count == (UINT)-1) {
return ErrorStack(ExtraError::FAILED_TO_GET_RAW_INPUT_BUFFER, code_location, "failed to get raw input buffer", getLastError());
}
else if (input_count) {
printf("input_count = %d n", input_count);
for (uint32_t i = 0; i < input_count; i++) {
RAWINPUT& raw_input = raw_inputs[i];
if (raw_input.header.dwType == RIM_TYPEMOUSE) {
printf("%d %d n", raw_input.data.mouse.lLastX, raw_input.data.mouse.lLastY);
}
}
}
}