qt sftp下载，使用Libssh2
QT SFTP下载功能的实现主要依赖于Libssh2库，这是一个C语言编写的SSH2协议实现库，提供了安全文件传输的SFTP子系统。在本项目中，使用的是VS2008作为编译环境，Qt版本为4.8.6，这表明项目可能基于Qt4框架构建。下面将详细介绍如何利用Libssh2库在Qt环境下实现SFTP文件下载。
我们需要安装和配置Libssh2库。下载libssh2源码后，在Visual Studio 2008环境下进行编译，确保生成适用于Qt4的动态链接库（dll）和静态库（lib）文件。安装完成后，需要将库文件添加到项目的编译路径中，以便编译时能够找到相关依赖。
接着，我们需要在Qt项目中引入Libssh2库。在.pro文件中，添加如下代码来链接库：
```cpp
LIBS += -L/path/to/libssh2 -lssh2
INCLUDEPATH += /path/to/include
```
这里的`/path/to/libssh2`和`/path/to/include`分别替换为实际的库文件和头文件路径。
然后，我们可以创建一个Qt的网络会话类，用于处理SFTP连接和文件传输。这个类通常包含初始化会话、认证用户、打开SFTP会话、列出远程目录、下载文件等方法。关键的Libssh2函数包括`ssh_init()`、`ssh_connect()`、`ssh_userauth_password()`、`ssh_sftp_init()`、`sftp_open()`和`sftp_read()`等。
以下是一个简化的SFTP下载示例代码：
```cpp
#include
#include
#include
#include
void downloadFile(QString remoteFilePath, QString localFilePath) {
ssh_session session = ssh_new();
// 连接服务器，设置端口、用户名、密码等
if (ssh_connect(session, "hostname", port, NULL, NULL, SSH２_VERSION_MIN, NULL, NULL) == SSH_OK) {
// 用户名和密码认证
if (ssh_userauth_password(session, NULL, "password") == SSH_OK) {
ssh_sftp sftpSession = ssh_sftp_init(session);
if (sftpSession != NULL) {
sftp_file file = sftp_open(sftpSession, remoteFilePath.toStdString().c_str(), O_RDONLY, 0);
if (file != NULL) {
QFile localFile(localFilePath);
if (localFile.open(QIODevice::WriteOnly)) {
char buffer[4096];
size_t bytesRead;
while ((bytesRead = sftp_read(file, buffer, sizeof(buffer))) > 0) {
localFile.write(QByteArray(buffer, bytesRead));
}
localFile.close();
}
sftp_close(file);
} else {
// 处理打开文件失败的情况
}
ssh_sftp_shutdown(sftpSession);
} else {
// 处理初始化SFTP会话失败的情况
}
} else {
// 处理认证失败的情况
}
} else {
// 处理连接失败的情况
}
ssh_disconnect(session);
ssh_free(session);
}
```
在上面的代码中，我们首先创建一个SSH会话，然后连接到服务器并进行密码认证。成功认证后，初始化SFTP会话，并打开远程文件。接着，我们将远程文件内容读取到本地文件。在读取过程中，使用`sftp_read()`函数读取一定数量的数据到缓冲区，然后写入本地文件。关闭文件和SFTP会话，释放SSH资源。
为了在应用程序中使用这个功能，你可以创建一个带有参数的槽函数，接收远程文件路径和本地保存路径，然后调用`downloadFile()`函数。这样，就可以通过传入不同的参数实现不同文件的下载。
在实际开发中，还需要处理各种错误情况，例如网络中断、认证失败、文件不存在等。同时，为了提高用户体验，可以添加进度条或状态提示，显示文件传输进度。
这个名为`sftptest_bak`的压缩包可能包含了已经编译好的程序，可以直接运行来测试SFTP下载功能。如果你需要自定义或修改这个功能，可以参考上述代码和库的文档来实现自己的Qt SFTP客户端。
文件下载
资源详情
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