win32 中的 Readfile 和 Writefile 失败,错误代码为 1
代码:
hHCDev = CreateFileA(completeDeviceName,
//"F:\\test.txt",
GENERIC_WRITE|GENERIC_READ,
FILE_SHARE_WRITE|FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
0,
NULL);
if (hHCDev == INVALID_HANDLE_VALUE)
{
CloseHandle(hHCDev);
}
else
{
char bufRead[256] = {0};
DWORD countRead = 0;
BOOL result ;
result = ReadFile(hHCDev, bufRead, 5, &countRead, NULL) ;
if(!result)
{
printf("Reading file error %d\n", GetLastError());
}
char bufWrite[] = {'7', '8', '9', ' '};
DWORD countWritten = 0;
result = WriteFile(hHCDev, bufWrite, 3, &countWritten, NULL) ;
if(!result)
{
printf("Writing file error %d\n", GetLastError());
}
else
{
printf("sucess");
}
CloseHandle(hHCDev);
}
memset(completeDeviceName,0,256) ;
描述:
我们尝试打开使用 createfile() 连接的 USB 设备。 我们尝试使用 Readfile 和 Writefile() 调用与设备进行通信。 但这些调用返回错误代码 1。可能是什么原因?
我们将非常感谢您的帮助。
此致 苏仁
Code :
hHCDev = CreateFileA(completeDeviceName,
//"F:\\test.txt",
GENERIC_WRITE|GENERIC_READ,
FILE_SHARE_WRITE|FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
0,
NULL);
if (hHCDev == INVALID_HANDLE_VALUE)
{
CloseHandle(hHCDev);
}
else
{
char bufRead[256] = {0};
DWORD countRead = 0;
BOOL result ;
result = ReadFile(hHCDev, bufRead, 5, &countRead, NULL) ;
if(!result)
{
printf("Reading file error %d\n", GetLastError());
}
char bufWrite[] = {'7', '8', '9', ' '};
DWORD countWritten = 0;
result = WriteFile(hHCDev, bufWrite, 3, &countWritten, NULL) ;
if(!result)
{
printf("Writing file error %d\n", GetLastError());
}
else
{
printf("sucess");
}
CloseHandle(hHCDev);
}
memset(completeDeviceName,0,256) ;
Description:
We tried to open the USB device connected using createfile(). Using Readfile and Writefile() calls we tried to communicate with the device. But these calls returned with error code 1. What might be the reason??
Your Help would be highly appreciated.
Best Regards
Suren
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