DELPHI中USB控件
DELPHI中USB控件是开发人员用于与USB设备交互的一种工具，特别是在Windows平台上进行桌面应用程序开发时。本文将深入探讨DELPHI中USB控件的使用、功能以及如何操作HID（Human Interface Device）设备。
USB（Universal Serial Bus）是一种通用串行总线标准，广泛应用于各种硬件设备的连接，如键盘、鼠标、打印机、摄像头等。DELPHI，作为一款强大的面向对象的编程环境，提供了一系列接口和控件，使得开发者可以轻松地在程序中集成USB设备的功能。
1. **USB控件介绍**
DELPHI中的USB控件通常是由第三方库提供的，比如JEDI VCL或Tusba。这些控件提供了封装好的API，允许开发者通过简单的代码来实现USB设备的枚举、打开、读写和关闭等操作。它们通常会包含一系列的事件和方法，如OnDeviceChange、OpenDevice、ReadData和WriteData等。
2. **HID设备操作**
HID设备是最常见的USB设备类型，包括输入设备（如键盘、鼠标）和部分输出设备（如游戏控制器）。HID设备使用预定义的报告描述符，使得它们能跨平台工作而无需驱动程序。在DELPHI中操作HID设备，首先需要枚举所有已连接的HID设备，然后根据设备的VID（Vendor ID）和PID（Product ID）来识别目标设备。使用USB控件提供的OpenDevice方法打开设备后，即可通过ReadData和WriteData方法来发送和接收数据。
3. **使用步骤**
- **枚举设备**：调用控件提供的枚举函数，获取所有HID设备的信息。
- **选择设备**：依据设备的VID和PID筛选出目标设备。
- **打开设备**：使用OpenDevice方法，传入设备句柄，建立与设备的连接。
- **数据传输**：调用ReadData或WriteData方法，实现数据的读取和写入。
- **处理事件**：绑定控件的事件，如OnDataReceived，以便在接收到设备数据时执行相应操作。
- **关闭设备**：完成操作后，记得调用CloseDevice方法断开连接。
4. **注意事项**
- 在进行USB操作时，确保具备相应的权限，否则可能无法访问设备。
- 由于HID设备的特性，其通信协议可能与非HID设备不同，需要了解设备的具体规格和报告描述符。
- 在处理多线程应用时，需注意同步问题，防止数据冲突和丢失。
5. **示例代码**
下面是一个简单的DELPHI代码片段，展示了如何使用USB控件枚举和打开一个HID设备：
```delphi
uses
UsbHid; // 假设我们有一个名为UsbHid的USB控件库
var
DevHandle: THandle;
DevInfo: TDevInfo;
begin
// 枚举HID设备
UsbHid.EnumerateDevices;
// 遍历设备列表
for DevInfo in UsbHid.Devices do
begin
if (DevInfo.VendorID = YourVendorID) and (DevInfo.ProductID = YourProductID) then
begin
// 打开设备
DevHandle := UsbHid.OpenDevice(DevInfo);
if DevHandle <> 0 then
begin
// ... 这里进行读写数据和其他操作
// ...
// 关闭设备
UsbHid.CloseDevice(DevHandle);
end;
end;
end;
end;
```
6. **调试和故障排查**
当遇到USB设备连接或通信问题时，可以利用Windows自带的设备管理器查看设备状态，或者使用USB分析工具进行更详细的日志跟踪。同时，确保控件库版本与DELPHI版本兼容，并查阅相关文档以解决特定问题。
DELPHI中的USB控件为开发者提供了便利，使他们能够快速集成USB设备功能，特别是对于HID设备的操作。理解控件的基本用法、设备操作流程以及可能出现的问题，是成功开发USB应用的关键。
文件下载
资源详情
[{"title":"（ 77 个子文件 907KB ） DELPHI中USB控件","children":[{"title":"usb_delphi","children":[{"title":"SetupApi.pas <span style='color:#111;'> 373.28KB </span>","children":null,"spread":false},{"title":"HidController.dpk <span style='color:#111;'> 747B </span>","children":null,"spread":false},{"title":"HidController.res <span style='color:#111;'> 1.50KB </span>","children":null,"spread":false},{"title":"HidController.cfg <span style='color:#111;'> 355B </span>","children":null,"spread":false},{"title":"HelpEn","children":[{"title":"BMP","children":[{"title":"published.bmp <span style='color:#111;'> 246B </span>","children":null,"spread":false},{"title":"readonly.bmp <span style='color:#111;'> 246B </span>","children":null,"spread":false},{"title":"Robert.bmp <span style='color:#111;'> 23.10KB </span>","children":null,"spread":false},{"title":"usb.bmp <span style='color:#111;'> 838B </span>","children":null,"spread":false},{"title":"empty.bmp <span style='color:#111;'> 246B </span>","children":null,"spread":false}],"spread":true},{"title":"HidController.hpj <span style='color:#111;'> 574B </span>","children":null,"spread":false},{"title":"HidController.toc <span style='color:#111;'> 297B </span>","children":null,"spread":false},{"title":"HidController.cnt <span style='color:#111;'> 177B </span>","children":null,"spread":false},{"title":"HIDCONTROLLER.HLP <span style='color:#111;'> 91.89KB </span>","children":null,"spread":false}],"spread":true},{"title":"windowsonly.inc <span style='color:#111;'> 1.61KB </span>","children":null,"spread":false},{"title":"HidUsage.pas <span style='color:#111;'> 99.87KB </span>","children":null,"spread":false},{"title":"HidControllerClass.dcr <span style='color:#111;'> 1.71KB </span>","children":null,"spread":false},{"title":"HID.pas <span style='color:#111;'> 115.63KB </span>","children":null,"spread":false},{"title":"HidController.~dpk <span style='color:#111;'> 750B </span>","children":null,"spread":false},{"title":"DEMOS","children":[{"title":"Delphi","children":[{"title":"BasicDemo","children":[{"title":"BasicMain.dfm <span style='color:#111;'> 3.40KB </span>","children":null,"spread":false},{"title":"BasicMain.pas <span style='color:#111;'> 979B </span>","children":null,"spread":false},{"title":"BasicDemo.cfg <span style='color:#111;'> 518B </span>","children":null,"spread":false},{"title":"BasicDemo.dof <span style='color:#111;'> 3.08KB </span>","children":null,"spread":false},{"title":"BasicMain.ddp <span style='color:#111;'> 51B </span>","children":null,"spread":false},{"title":"BasicDemo.dpr <span style='color:#111;'> 206B </span>","children":null,"spread":false},{"title":"BasicMain.~dfm <span style='color:#111;'> 3.34KB </span>","children":null,"spread":false},{"title":"JediJ.ico <span style='color:#111;'> 1.05KB </span>","children":null,"spread":false},{"title":"BasicDemo.res <span style='color:#111;'> 876B </span>","children":null,"spread":false},{"title":"BasicMain.~pas <span style='color:#111;'> 835B </span>","children":null,"spread":false}],"spread":true},{"title":"UsagesDemo","children":[{"title":"UsagesDemo.dpr <span style='color:#111;'> 284B </span>","children":null,"spread":false},{"title":"UsagesMain.dfm <span style='color:#111;'> 3.65KB </span>","children":null,"spread":false},{"title":"Info.pas <span style='color:#111;'> 9.12KB </span>","children":null,"spread":false},{"title":"UsagesDemo.dof <span style='color:#111;'> 2.87KB </span>","children":null,"spread":false},{"title":"UsagesDemo.cfg <span style='color:#111;'> 518B </span>","children":null,"spread":false},{"title":"UsagesMain.pas <span style='color:#111;'> 1.91KB </span>","children":null,"spread":false},{"title":"UsagesInfo.pas <span style='color:#111;'> 144.97KB </span>","children":null,"spread":false},{"title":"UsagesDemo.res <span style='color:#111;'> 876B </span>","children":null,"spread":false},{"title":"Info.dfm <span style='color:#111;'> 3.55KB </span>","children":null,"spread":false},{"title":"Info.ddp <span style='color:#111;'> 51B </span>","children":null,"spread":false},{"title":"JediJ.ico <span style='color:#111;'> 1.05KB </span>","children":null,"spread":false},{"title":"UsagesMain.ddp <span style='color:#111;'> 51B </span>","children":null,"spread":false}],"spread":false},{"title":"ReadWriteDemo","children":[{"title":"DevReader.dfm <span style='color:#111;'> 2.77KB </span>","children":null,"spread":false},{"title":"Info.pas <span style='color:#111;'> 1.79KB </span>","children":null,"spread":false},{"title":"SimpleHIDWrite.res <span style='color:#111;'> 876B </span>","children":null,"spread":false},{"title":"DevReader.~dfm <span style='color:#111;'> 2.77KB </span>","children":null,"spread":false},{"title":"SimpleHIDWrite.cfg <span style='color:#111;'> 518B </span>","children":null,"spread":false},{"title":"DevReader.~pas <span style='color:#111;'> 6.90KB </span>","children":null,"spread":false},{"title":"DevReader.pas <span style='color:#111;'> 6.90KB </span>","children":null,"spread":false},{"title":"DevReader.~ddp <span style='color:#111;'> 51B </span>","children":null,"spread":false},{"title":"SimpleHIDWrite.dpr <span style='color:#111;'> 245B </span>","children":null,"spread":false},{"title":"Info.dfm <span style='color:#111;'> 3.23KB </span>","children":null,"spread":false},{"title":"SimpleHIDWrite.dof <span style='color:#111;'> 1.99KB </span>","children":null,"spread":false},{"title":"DevReader.ddp <span style='color:#111;'> 51B </span>","children":null,"spread":false}],"spread":false}],"spread":true}],"spread":true},{"title":"jvcl.inc <span style='color:#111;'> 4.44KB </span>","children":null,"spread":false},{"title":"JvHidControllerClass.pas <span style='color:#111;'> 75.18KB </span>","children":null,"spread":false},{"title":"HidController.dof <span style='color:#111;'> 2.31KB </span>","children":null,"spread":false},{"title":"DBT.pas <span style='color:#111;'> 18.49KB </span>","children":null,"spread":false},{"title":"jedi.inc <span style='color:#111;'> 37.24KB </span>","children":null,"spread":false},{"title":"DCU","children":[{"title":"HidController.dcu <span style='color:#111;'> 3.62KB </span>","children":null,"spread":false},{"title":"DevReader.dcu <span style='color:#111;'> 11.84KB </span>","children":null,"spread":false},{"title":"UsagesInfo.dcu <span style='color:#111;'> 164.81KB </span>","children":null,"spread":false},{"title":"DCU.TXT <span style='color:#111;'> 130B </span>","children":null,"spread":false},{"title":"DBT.dcu <span style='color:#111;'> 5.95KB </span>","children":null,"spread":false},{"title":"BasicMain.dcu <span style='color:#111;'> 4.36KB </span>","children":null,"spread":false},{"title":"JvHidControllerClass.dcu <span style='color:#111;'> 62.21KB </span>","children":null,"spread":false},{"title":"HidUsage.dcu <span style='color:#111;'> 82.69KB </span>","children":null,"spread":false},{"title":"Info.dcu <span style='color:#111;'> 5.75KB </span>","children":null,"spread":false},{"title":"UsagesMain.dcu <span style='color:#111;'> 5.35KB </span>","children":null,"spread":false},{"title":"ModuleLoader.dcu <span style='color:#111;'> 2.29KB </span>","children":null,"spread":false},{"title":"HID.dcu <span style='color:#111;'> 16.75KB </span>","children":null,"spread":false},{"title":"SetupApi.dcu <span style='color:#111;'> 122.51KB </span>","children":null,"spread":false}],"spread":false},{"title":"HidToken.pas <span style='color:#111;'> 6.30KB </span>","children":null,"spread":false},{"title":"BIN","children":[{"title":"SimpleHIDWrite.exe <span style='color:#111;'> 508.50KB </span>","children":null,"spread":false},{"title":"BIN.TXT <span style='color:#111;'> 39B </span>","children":null,"spread":false},{"title":"BasicDemo.exe <span style='color:#111;'> 472.00KB </span>","children":null,"spread":false},{"title":"UsagesDemo.exe <span style='color:#111;'> 609.00KB </span>","children":null,"spread":false}],"spread":false},{"title":"ModuleLoader.pas <span style='color:#111;'> 10.88KB </span>","children":null,"spread":false},{"title":"README.TXT <span style='color:#111;'> 16.34KB </span>","children":null,"spread":false}],"spread":false}],"spread":true}]
评论信息
其他资源
- dm8-win64.zip
- ffmpeg-4.2.2-win64-dev ffmpeg-4.2.2-win64-shared
- MFC使用ADO实现与Oracle数据库的操作
- matlab和admas联合仿真的PID控制。用admas打开哦
- Jetson-tx2数据手册
- matlab 基于视频的车流量统计
- 广工 软件工程课程设计 商品交易系统 二手 市场 交易系统 代码和报告
- c#使用ffmpeg显示rtsp视频流
- ISO 26262 最新版（2018）1-12部分
- keil_ARM.CMSIS.4.5.0.pack
- 【完整版程序+仿真结果+论文】数字密码锁设计.zip
- pubeprop:登陆页面做titioAndré-源码
- aspose-words-15.8.0-jdk16.jar
- 32.深度解密三十二：详解影响QQ群整体排名的那些秘密.pdf
- 都柏林核心元数据集-dublin core metadata
- jquery-1.11 资源
- openssl_vfp.rar
- 传智播客 杨中科 十三季全 种子 asp.net
- TCI/IP协议详解卷一第二版(中文)含目录
- Java-WebSocket完整代码包
- Digital Integrated Circuits A Design Perspective
免责申明
【只为小站】的资源来自网友分享，仅供学习研究，请务必在下载后24小时内给予删除，不得用于其他任何用途，否则后果自负。基于互联网的特殊性，【只为小站】 无法对用户传输的作品、信息、内容的权属或合法性、合规性、真实性、科学性、完整权、有效性等进行实质审查；无论 【只为小站】 经营者是否已进行审查，用户均应自行承担因其传输的作品、信息、内容而可能或已经产生的侵权或权属纠纷等法律责任。
本站所有资源不代表本站的观点或立场，基于网友分享，根据中国法律《信息网络传播权保护条例》第二十二条之规定，若资源存在侵权或相关问题请联系本站客服人员，zhiweidada#qq.com，请把#换成@，本站将给予最大的支持与配合，做到及时反馈和处理。关于更多版权及免责申明参见 版权及免责申明
本站所有资源不代表本站的观点或立场，基于网友分享，根据中国法律《信息网络传播权保护条例》第二十二条之规定，若资源存在侵权或相关问题请联系本站客服人员，zhiweidada#qq.com，请把#换成@，本站将给予最大的支持与配合，做到及时反馈和处理。关于更多版权及免责申明参见 版权及免责申明