USB3014-应用程序开发_begindataxfer(buffer, length, &outovlap);

简介：

使用VC6++开发：

出现如下问题

  （1）添加对应的头文件

#include <iostream>
#include <string>
using namespace std;

#include <wtypes.h>
#include <dbt.h>

 

（2）

libcmt.lib(_file.obj) : error LNK2005: ___initstdio already defined in LIBCD.lib(_file.obj)

LINK : warning LNK4098: defaultlib "LIBCMT" conflicts with use of other libs

设置为多线程DLL

添加setupapi.lib

忽略libcmt

  （3） CyAPI.lib(CyAPI.obj) : error LNK2001: unresolved external symbol ___security    ...

根本原因是官方的lib需要使用VS2008以上环境开发，如果替换老版的CyAPI.lib可以成功生成但，数据读取结果不一定对。虽然迷恋VC6的小巧，也只能跟换VS2008,Windows

的开发环境版本越高越占内存。

https://community.cypress.com/t5/Knowledge-Base-Articles/Additional-CyAPI-lib-libraries-besides-Visual-C-2008/ta-p/248218

（4）其它

#pragma comment(lib, "test.lib")

VS2008开发：直接打开开发环境中的参考设计：注意lib路径中的Debug改成lib即可

D:\Program Files (x86)\Cypress\EZ-USB FX3 SDK\1.3\application\cpp\streamer

同VC6一样遇到类似问题，需要添加setupapi.lib并设置忽略libcmt，如下：

数据发送：

//BeginDataXfer is an advanced method for performing asynchronous IO
// This example assumes that the device automatically sends back,
// over its bulk-IN endpoint, any bytes that were received over its
// bulk-OUT endpoint (commonly referred to as a loopback function)
    //CCyUSBDevice *USBDevice = new CCyUSBDevice(NULL);
	OVERLAPPED outOvLap, inOvLap;
	//outOvLap.hEvent = CreateEvent(NULL, false, false, L"CYUSB_OUT");
	outOvLap.hEvent = CreateEvent(NULL, false, false, "CYUSB_OUT");
	//inOvLap.hEvent = CreateEvent(NULL, false, false, L"CYUSB_IN");
	//unsigned char inBuf[128];
	//ZeroMemory(inBuf, 128);
	unsigned char buffer[28];
	LONG length = 28;
    buffer[0] = 0xa0;
    buffer[1] = 0x10;
    buffer[2] = 0x20;
    buffer[3] = 0x30;
 
    buffer[24] = 0xc0;
    buffer[25] = 0x10;
    buffer[26] = 0x20;
    buffer[27] = 0x30;
	// Request the return data before initiating the loopback
	//UCHAR *inContext = USBDevice->BulkInEndPt->BeginDataXfer(inBuf, length,&inOvLap);
	UCHAR *outContext = USBDevice->BulkOutEndPt->BeginDataXfer(buffer, length,&outOvLap);
	USBDevice->BulkOutEndPt->WaitForXfer(&outOvLap,100);
	//USBDevice->BulkInEndPt->WaitForXfer(&inOvLap,100);
	USBDevice->BulkOutEndPt->FinishDataXfer(buffer, length, &outOvLap,outContext);
	//USBDevice->BulkInEndPt->FinishDataXfer(inBuf, length, &inOvLap, inContext);
	CloseHandle(outOvLap.hEvent);
	//CloseHandle(inOvLap.hEvent);

 

 

参考：

Cypress USBSuite Application Development Guide Version 1.2.3.20

CyAPI.pdf