在winapi gui应用程序中显示实时视图图像的edsdk c++代码

#include <Windows.h>
#include "EDSDK.h"
#include "EDSDKErrors.h"

// 定义全局变量
EdsCameraRef camera;
EdsStreamRef stream;
HWND hwnd;

// 回调函数，用于处理实时视图图像数据
EdsError EDSCALLBACK handleImageEvent(EdsUInt32 inEvent, EdsBaseRef inRef, EdsVoid *inContext)
{
    if (inEvent == kEdsObjectEvent_DirItemRequestTransfer)
    {
        EdsDirectoryItemRef dirItem = (EdsDirectoryItemRef)inRef;
        EdsDownload(dirItem, 0, stream);
        EdsDownloadComplete(dirItem);
        InvalidateRect(hwnd, NULL, TRUE);
    }
    return EDS_ERR_OK;
}

// 窗口过程函数，用于处理窗口消息
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch (msg)
    {
        case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint(hwnd, &ps);
            
            // 将实时视图图像绘制到窗口上
            EdsGetPointer(stream, (EdsVoid**)&pBuffer);
            // 绘制pBuffer到hdc上
            
            EndPaint(hwnd, &ps);
            break;
        }
        
        case WM_DESTROY:
        {
            // 释放资源
            EdsRelease(stream);
            EdsRelease(camera);
            EdsTerminateSDK();
            PostQuitMessage(0);
            break;
        }
        
        default:
            return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    
    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    // 初始化EDSDK
    EdsInitializeSDK();
    
    // 创建窗口
    HWND hwnd;
    WNDCLASS wc = {0};
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.lpszClassName = L"WinAPIApp";
    RegisterClass(&wc);
    hwnd = CreateWindow(wc.lpszClassName, L"WinAPI App", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 800, 600, NULL, NULL, hInstance, NULL);
    
    // 连接相机
    EdsOpenSession(camera);
    
    // 创建图像流
    EdsCreateMemoryStream(0, &stream);
    EdsSetCameraStateEventHandler(camera, kEdsStateEvent_All, handleImageEvent, NULL);
    
    // 显示窗口
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);
    
    // 消息循环
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    
    return (int)msg.wParam;
}