createfile TRUNCATE_EXISTING [英] createfile TRUNCATE_EXISTING

问题描述

我正在读取HID设备文件以检索句柄以供以后处理。问题是为什么从f139将pid值更改为0003导致createfile失败并返回值为5（TRUNCATE_EXISTING）？将pid值更改回原始
值意味着createfile函数不会出错。

I am reading a HID device file to retrieve a handle for later processing. The question is why would changing the pid value to 0003 from f139 cause the createfile to fail with a return value of 5 (TRUNCATE_EXISTING) ? Changing the pid value back to the original value means the createfile function does not error out.

原始代码行：

HIDfile = CreateFile（（LPSTR）devicePath，GENERIC_READ，FILE_SHARE_READ，NULL，OPEN_EXISTING，FILE_ATTRIBUTE_NORMAL，NULL）;

HIDfile = CreateFile((LPSTR)devicePath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

Randy

Randy Seedle

Randy Seedle

推荐答案

在10/4/2017 10:22 PM，Randy Seedle写道：

On 10/4/2017 10:22 PM, Randy Seedle wrote:

我正在读取HID设备文件以检索句柄以供以后处理。问题是为什么从f139将pid值更改为0003会导致createfile失败并返回值为5（TRUNCATE_EXISTING）？

I am reading a HID device file to retrieve a handle for later processing. The question is why would changing the pid value to 0003 from f139 cause the createfile to fail with a return value of 5 (TRUNCATE_EXISTING) ?

错误代码5将是ERROR_ACCESS_DENIED。我对HID一无所知，希望这个小事实可以帮助你避免追逐红鲱鱼。

Error code 5 would be ERROR_ACCESS_DENIED. I don't know anything about HID, just hoping this little fact would help you avoid chasing a red herring.

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