vc6 & libusb
偶然间把一个usbbulk 的实验在java 里实现了，刚才又在VC 下用libusb 做了一个，虽然很简单，但也是遇到一个问题，在这里记下，为了备忘，也为了让同路人少走弯路。
首先 把usb.h ，libusb0.dll ，libusb.lib 放到工程目录里，然后就是要在project setting 里添加libusb.lib 如下图：
然后就是写代码了,开始的时候不知道流程，总提示 could not claim interface 0 , 却不知道怎么办，偶尔在http://lists.alioth.debian.org/pipermail/sane-devel/2003-February/006638.html
看到usb_set_configuration(hdev, 1);
于是有了下面测试成功的程序：
// usb_paul.cpp : Defines the entry point for the console application.
//paul phenix s-yaojing@163.com
#include “stdafx.h”
#include “usb.h”
#define USB_VID 0×547
#define USB_PID 0×1002
int main(int argc, char* argv[])
{
struct usb_bus *bus;
struct usb_device *dev;
usb_dev_handle *hdev;
char writedata[] = {1,2,3,4,5};
char readdata[sizeof(writedata)];
printf(”Hello World!\n”);
usb_init();
usb_set_debug(3);
usb_find_busses();
usb_find_devices();
for (bus = usb_get_busses(); bus;bus->next)
{
for (dev = bus->devices; dev; dev->next)
{
hdev = usb_open(dev);
if (hdev)
{
int VID = dev->descriptor.idVendor;
int PID = dev->descriptor.idProduct;
if ((VID == USB_VID)&(PID == USB_PID))
{
printf(”The PID is 0x%4x \n”,PID);
printf(”The VID is 0x%4x \n”,VID);
usb_set_configuration(hdev, 1);
usb_claim_interface(hdev,0);
usb_bulk_write(hdev,0×04,writedata,sizeof(writedata),2000);
usb_bulk_read(hdev,0×88,readdata,sizeof(readdata),2000);
}
printf(”Readdata is :\n”);
for (int i =0 ;i<sizeof(readdata);i++)
{
printf(”Readdata is %d “,readdata[i]);
}
}
usb_close(hdev);
break;
}
break;
}
return 0;
}
其实功能很简单，就是在一个端点写入一组数据，然后在另外的一个端点读出，然后打印出来。在68013上跑的程序是bulkloop。
from: http://s-yaojing.blog.163.com/blog/static/15455309200891045038662/
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