WIN32实现远程桌面监控

2024-08-27 01:20
文章标签 实现 监控 win32 远程桌面

本文主要是介绍WIN32实现远程桌面监控，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

文章目录

    • 完整代码
      • API简介
      • 调试代码
    • 后记
    • reference

完整代码

server.cpp

#include <winsock2.h>
#include <Ws2tcpip.h>
#include <windows.h>
#include <stdio.h>
#include <vector>
#pragma comment(lib, "ws2_32.lib")LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
void RenderBitmap(HDC hdc, BYTE* bBits, int width, int height, int windowWidth, int windowHeight);class xy {
public:int x;int y;
};int main(void)
{// Initialize WinSockWSADATA wsaData;WSAStartup(MAKEWORD(2, 2), &wsaData);SOCKET serverSocket = socket(AF_INET, SOCK_STREAM, 0);sockaddr_in serverAddr;serverAddr.sin_family = AF_INET;serverAddr.sin_port = htons(8888);  // Port numberinet_pton(AF_INET, "127.0.0.1", &serverAddr.sin_addr.s_addr);bind(serverSocket, (sockaddr*)&serverAddr, sizeof(serverAddr));listen(serverSocket, 5);// Wait for client connectionSOCKET clientSocket = accept(serverSocket, NULL, NULL);xy data;recv(clientSocket, (char*)&data, sizeof(data), 0);// Register window classWNDCLASS wc = { 0 };wc.lpfnWndProc = WndProc;wc.hInstance = GetModuleHandle(NULL);wc.lpszClassName = L"ScreenCaptureReceiverWindowClass";RegisterClass(&wc);// Set up the bitmap for renderingBITMAPINFO bInfo;HBITMAP hBitmap;BYTE* bBits = nullptr;int screenWidth = data.x;  // Set screen widthint screenHeight = data.y; // Set screen heightint windowWidth = 800;int windowHeight = 600;float screenAspect = (float)screenWidth / screenHeight;float windowAspect = (float)windowWidth / windowHeight;// Adjust window size to maintain the screen aspect ratioif (screenAspect > windowAspect){windowHeight = (INT)(windowWidth / screenAspect);}else{windowWidth = (INT)(windowHeight * screenAspect);}RECT rect = { 0, 0, windowWidth, windowHeight };AdjustWindowRect(&rect, WS_OVERLAPPEDWINDOW, FALSE);ZeroMemory(&bInfo, sizeof(BITMAPINFO));bInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);bInfo.bmiHeader.biBitCount = 24;bInfo.bmiHeader.biCompression = BI_RGB;bInfo.bmiHeader.biPlanes = 1;bInfo.bmiHeader.biWidth = screenWidth;bInfo.bmiHeader.biHeight = -screenHeight;  // Top-down HWND hwnd = CreateWindowEx(0, wc.lpszClassName, L"Screen Receiver", WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, CW_USEDEFAULT, rect.right - rect.left, rect.bottom - rect.top, NULL, NULL, wc.hInstance, NULL);ShowWindow(hwnd, SW_SHOW);HDC hdc = GetDC(hwnd);hBitmap = CreateDIBSection(hdc, &bInfo, DIB_RGB_COLORS, (VOID**)&bBits, NULL, 0);// Main message loopMSG msg = { 0 };while (msg.message != WM_QUIT){if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)){TranslateMessage(&msg);DispatchMessage(&msg);}else{// Receive image data from the clientint len = screenWidth * screenHeight * 3;recv(clientSocket, (char*)bBits, len, 0);// Render the received bitmapRenderBitmap(hdc, bBits, screenWidth, screenHeight, windowWidth, windowHeight);Sleep(200);  // Adjust the refresh rate}}// Clean upDeleteObject(hBitmap);ReleaseDC(hwnd, hdc);closesocket(clientSocket);closesocket(serverSocket);WSACleanup();return 0;
}void RenderBitmap(HDC hdc, BYTE* bBits, int width, int height, int windowWidth, int windowHeight)
{BITMAPINFO bInfo;ZeroMemory(&bInfo, sizeof(BITMAPINFO));bInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);bInfo.bmiHeader.biBitCount = 24;bInfo.bmiHeader.biCompression = BI_RGB;bInfo.bmiHeader.biPlanes = 1;bInfo.bmiHeader.biWidth = width;bInfo.bmiHeader.biHeight = -height;SetStretchBltMode(hdc, HALFTONE);StretchDIBits(hdc, 0, 0, windowWidth, windowHeight, 0, 0, width, height, bBits, &bInfo, DIB_RGB_COLORS, SRCCOPY);
}LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{switch (msg){case WM_DESTROY:PostQuitMessage(0);break;default:return DefWindowProc(hwnd, msg, wParam, lParam);}return 0;
}

client.cpp

#include <winsock2.h>
#include <Ws2tcpip.h>
#include <windows.h>
#include <vector>
#include<iostream>
#pragma comment(lib, "ws2_32.lib")
using namespace std;
std::vector<int> getxy();
class xyz {
public:int x;int y;
};
int main(void)
{// Initialize WinSockWSADATA wsaData;WSAStartup(MAKEWORD(2, 2), &wsaData);SOCKET clientSocket = socket(AF_INET, SOCK_STREAM, 0);sockaddr_in serverAddr;serverAddr.sin_family = AF_INET;serverAddr.sin_port = htons(8888);  // Port numberinet_pton(AF_INET, "127.0.0.1", &serverAddr.sin_addr.s_addr);// Replace with the server's IP addressconnect(clientSocket, (sockaddr*)&serverAddr, sizeof(serverAddr));// Get screen dimensionsvector<int> xy = getxy();int screenWidth = xy[0];int screenHeight = xy[1];xyz data;data.x = screenWidth;data.y = screenHeight;send(clientSocket, (char*)&data, sizeof(data), 0);// Set up the screen captureBITMAPINFO bInfo;HDC hDC, hMemDC;HBITMAP hBitmap;BYTE* bBits = NULL;hDC = GetDC(NULL);hMemDC = CreateCompatibleDC(hDC);ZeroMemory(&bInfo, sizeof(BITMAPINFO));bInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);bInfo.bmiHeader.biBitCount = 24;bInfo.bmiHeader.biCompression = BI_RGB;bInfo.bmiHeader.biPlanes = 1;bInfo.bmiHeader.biWidth = screenWidth;bInfo.bmiHeader.biHeight = -screenHeight;hBitmap = CreateDIBSection(hDC, &bInfo, DIB_RGB_COLORS, (VOID**)&bBits, NULL, 0);SelectObject(hMemDC, hBitmap);int len = screenWidth * screenHeight * 3;// Main loop to capture and send screen datawhile (true){BitBlt(hMemDC, 0, 0, screenWidth, screenHeight, hDC, 0, 0, SRCCOPY);send(clientSocket, (char*)bBits, len, 0);Sleep(20);  // Adjust the sending rate}// Clean upDeleteObject(hBitmap);DeleteDC(hMemDC);ReleaseDC(NULL, hDC);closesocket(clientSocket);WSACleanup();return 0;
}std::vector<int> getxy() {HWND hWnd = GetDesktopWindow();//根据需要可以替换成自己程序的句柄 HMONITOR hMonitor = MonitorFromWindow(hWnd, MONITOR_DEFAULTTONEAREST);DEVMODE dm;MONITORINFOEX miex;dm.dmSize = sizeof(dm);dm.dmDriverExtra = 0;miex.cbSize = sizeof(miex);GetMonitorInfo(hMonitor, &miex);// 获取监视器物理宽度与高度EnumDisplaySettings(miex.szDevice, ENUM_CURRENT_SETTINGS, &dm);int cxPhysical = dm.dmPelsWidth;int cyPhysical = dm.dmPelsHeight;vector<int> ret;ret.push_back(cxPhysical);ret.push_back(cyPhysical);return ret;
}

效果展示

在这里插入图片描述

API简介

WSAStartup

int WSAAPI WSAStartup([in]  WORD      wVersionRequested,[out] LPWSADATA lpWSAData
);

wsastartup

  1. 初始化 Winsock 库：加载并初始化 Winsock 库的必要组件。
  2. 版本检查：应用程序可以通过 WSAStartup 指定所需的 Winsock 版本，同时函数会返回实际初始化的版本信息。
  3. 资源分配：为应用程序的网络操作分配必要的资源。

调用 WSAStartup 成功后，应用程序才能继续进行网络编程。当应用程序完成所有网络操作后，应调用 WSACleanup 函数来释放资源并终止 Winsock 使用。

inet_pton/inet_ntop

这两个函数是随IPv6出现的函数，对于IPv4地址和IPv6地址都适用，函数中p和n分别代表表达（presentation)和数值（numeric)。地址的表达格式通常是ASCII字符串，数值格式则是存放到套接字地址结构的二进制值。
int inet_pton(int family, const char *strptr, void *addrptr);     
const char * inet_ntop(int family, const void *addrptr, char *strptr, size_t len);

StretchBlt /BitBlt/StretchDIBits

StretchBlt 和 BitBlt 是 Windows GDI（图形设备接口）中的两个函数，用于在设备上下文（Device Context，DC）之间进行位图的复制和绘制操作。它们的主要区别在于是否进行图像的缩放。StretchDIBits从 DIB 数据（通常存储在内存中）到设备上下文进行更灵活的图像处理

调试代码

屏幕截屏

#include<stdio.h>
#include<windows.h>
#include<string>
#include<iostream>
using namespace std;
int main(void)
{BITMAPFILEHEADER bfHeader;BITMAPINFOHEADER biHeader;BITMAPINFO bInfo;HGDIOBJ hTempBitmap;HBITMAP hBitmap;BITMAP bAllDesktops;HDC hDC, hMemDC;LONG lWidth, lHeight;BYTE* bBits = NULL;HANDLE hHeap = GetProcessHeap();DWORD cbBits, dwWritten = 0;HANDLE hFile;INT x = GetSystemMetrics(SM_XVIRTUALSCREEN);INT y = GetSystemMetrics(SM_YVIRTUALSCREEN);ZeroMemory(&bfHeader, sizeof(BITMAPFILEHEADER));ZeroMemory(&biHeader, sizeof(BITMAPINFOHEADER));ZeroMemory(&bInfo, sizeof(BITMAPINFO));ZeroMemory(&bAllDesktops, sizeof(BITMAP));hDC = GetDC(NULL);hTempBitmap = GetCurrentObject(hDC, OBJ_BITMAP);GetObjectW(hTempBitmap, sizeof(BITMAP), &bAllDesktops);lWidth = bAllDesktops.bmWidth;lHeight = bAllDesktops.bmHeight;//get lWidth lHeightDeleteObject(hTempBitmap);bfHeader.bfType = (WORD)('B' | ('M' << 8));//小端存储BMbfHeader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);biHeader.biSize = sizeof(BITMAPINFOHEADER);biHeader.biBitCount = 24;biHeader.biCompression = BI_RGB;biHeader.biPlanes = 1;biHeader.biWidth = lWidth;biHeader.biHeight = lHeight;bInfo.bmiHeader = biHeader;cbBits = (((24 * lWidth + 31) & ~31) / 8) * lHeight;//~31 相当于将最低 5 位全置为 0，保证是32的倍数(四字节对齐)hMemDC = CreateCompatibleDC(hDC);hBitmap = CreateDIBSection(hDC, &bInfo, DIB_RGB_COLORS, (VOID**)&bBits, NULL, 0);SelectObject(hMemDC, hBitmap);BitBlt(hMemDC, 0, 0, lWidth, lHeight, hDC, x, y, SRCCOPY);string path = "D:\\c_project\\dlltest\\a.bmp";hFile = CreateFileA(path.c_str(), GENERIC_WRITE | GENERIC_READ, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL,NULL);if (INVALID_HANDLE_VALUE == hFile){DeleteDC(hMemDC);ReleaseDC(NULL, hDC);DeleteObject(hBitmap);return FALSE;}WriteFile(hFile, &bfHeader, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);WriteFile(hFile, &biHeader, sizeof(BITMAPINFOHEADER), &dwWritten, NULL);WriteFile(hFile, bBits, cbBits, &dwWritten, NULL);FlushFileBuffers(hFile);CloseHandle(hFile);DeleteDC(hMemDC);ReleaseDC(NULL, hDC);DeleteObject(hBitmap);return TRUE;
}

保存的时刻为代码运行到BitBlt时刻的图像

本地实时渲染

#include <windows.h>
#include <stdio.h>
#include <string>
#include <iostream>
#include<vector>
using namespace std;LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
std::vector<int> getxy();
int main(void)
{// Register window classWNDCLASS wc = { 0 };wc.lpfnWndProc = WndProc;wc.hInstance = GetModuleHandle(NULL);wc.lpszClassName = L"ScreenCaptureWindowClass";RegisterClass(&wc);// Get screen dimensionsvector<int> xy = getxy();int screenWidth = xy[0];int screenHeight = xy[1];// Define the desired window size (e.g., 800x600)INT windowWidth = 800;INT windowHeight = 600;// Calculate aspect ratiosfloat screenAspect = (float)screenWidth / screenHeight;float windowAspect = (float)windowWidth / windowHeight;// Adjust window size to maintain the screen aspect ratioif (screenAspect > windowAspect){windowHeight = (INT)(windowWidth / screenAspect);}else{windowWidth = (INT)(windowHeight * screenAspect);}// Calculate window size including borders and title barRECT rect = { 0, 0, windowWidth, windowHeight };AdjustWindowRect(&rect, WS_OVERLAPPEDWINDOW, FALSE);// Create windowHWND hwnd = CreateWindowEx(0, wc.lpszClassName, L"Screen Capture", WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, CW_USEDEFAULT, rect.right - rect.left, rect.bottom - rect.top, NULL, NULL, wc.hInstance, NULL);ShowWindow(hwnd, SW_SHOW);// Set up the screen captureBITMAPINFO bInfo;HDC hDC, hMemDC;HBITMAP hBitmap;BYTE* bBits = NULL;hDC = GetDC(NULL);hMemDC = CreateCompatibleDC(hDC);ZeroMemory(&bInfo, sizeof(BITMAPINFO));bInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);bInfo.bmiHeader.biBitCount = 24;bInfo.bmiHeader.biCompression = BI_RGB;bInfo.bmiHeader.biPlanes = 1;bInfo.bmiHeader.biWidth = screenWidth;bInfo.bmiHeader.biHeight = -screenHeight;  // Negative height to indicate top-down DIBhBitmap = CreateDIBSection(hDC, &bInfo, DIB_RGB_COLORS, (VOID**)&bBits, NULL, 0);SelectObject(hMemDC, hBitmap);// Main message loopMSG msg = { 0 };while (msg.message != WM_QUIT){if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)){TranslateMessage(&msg);DispatchMessage(&msg);}else{// Capture the screenBitBlt(hMemDC, 0, 0, screenWidth, screenHeight, hDC, 0, 0, SRCCOPY);// Get the device context of the windowHDC hWindowDC = GetDC(hwnd);// Scale and paint the captured screen to fit the window sizeSetStretchBltMode(hWindowDC, HALFTONE);StretchBlt(hWindowDC, 0, 0, windowWidth, windowHeight, hMemDC, 0, 0, screenWidth, screenHeight, SRCCOPY);ReleaseDC(hwnd, hWindowDC);// Sleep for 0.2 seconds (200 milliseconds)//Sleep(200);}}// Clean upDeleteObject(hBitmap);DeleteDC(hMemDC);ReleaseDC(NULL, hDC);return 0;
}LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{switch (msg){case WM_DESTROY:PostQuitMessage(0);break;default:return DefWindowProc(hwnd, msg, wParam, lParam);}return 0;
}
std::vector<int> getxy() {HWND hWnd = GetDesktopWindow();//根据需要可以替换成自己程序的句柄 HMONITOR hMonitor = MonitorFromWindow(hWnd, MONITOR_DEFAULTTONEAREST);DEVMODE dm;MONITORINFOEX miex;dm.dmSize = sizeof(dm);dm.dmDriverExtra = 0;miex.cbSize = sizeof(miex);GetMonitorInfo(hMonitor, &miex);// 获取监视器物理宽度与高度EnumDisplaySettings(miex.szDevice, ENUM_CURRENT_SETTINGS, &dm);int cxPhysical = dm.dmPelsWidth;int cyPhysical = dm.dmPelsHeight;vector<int> ret;ret.push_back(cxPhysical);ret.push_back(cyPhysical);return ret;
}

传输渲染

#include <windows.h>
#include <stdio.h>
#include <string>
#include <iostream>
#include<vector>
using namespace std;LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
std::vector<int> getxy();int main(void)
{// Register window classWNDCLASS wc = { 0 };wc.lpfnWndProc = WndProc;wc.hInstance = GetModuleHandle(NULL);wc.lpszClassName = L"ScreenCaptureWindowClass";RegisterClass(&wc);// Get screen dimensionsvector<int> xy = getxy();int screenWidth = xy[0];int screenHeight = xy[1];// Define the desired window size (e.g., 800x600)INT windowWidth = 800;INT windowHeight = 600;// Calculate aspect ratiosfloat screenAspect = (float)screenWidth / screenHeight;float windowAspect = (float)windowWidth / windowHeight;// Adjust window size to maintain the screen aspect ratioif (screenAspect > windowAspect){windowHeight = (INT)(windowWidth / screenAspect);}else{windowWidth = (INT)(windowHeight * screenAspect);}// Calculate window size including borders and title barRECT rect = { 0, 0, windowWidth, windowHeight };AdjustWindowRect(&rect, WS_OVERLAPPEDWINDOW, FALSE);// Create windowHWND hwnd = CreateWindowEx(0, wc.lpszClassName, L"Screen Capture", WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, CW_USEDEFAULT, rect.right - rect.left, rect.bottom - rect.top, NULL, NULL, wc.hInstance, NULL);ShowWindow(hwnd, SW_SHOW);// Set up the screen captureBITMAPINFO bInfo;HDC hDC, hMemDC;HBITMAP hBitmap;BYTE* bBits = NULL;hDC = GetDC(NULL);hMemDC = CreateCompatibleDC(hDC);ZeroMemory(&bInfo, sizeof(BITMAPINFO));bInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);bInfo.bmiHeader.biBitCount = 24;bInfo.bmiHeader.biCompression = BI_RGB;bInfo.bmiHeader.biPlanes = 1;bInfo.bmiHeader.biWidth = screenWidth;bInfo.bmiHeader.biHeight = -screenHeight;  // Negative height to indicate top-down DIBhBitmap = CreateDIBSection(hDC, &bInfo, DIB_RGB_COLORS, (VOID**)&bBits, NULL, 0);SelectObject(hMemDC, hBitmap);int len = screenWidth * screenHeight * 3;// Allocate a buffer for storing the screen dataBYTE* screenBuffer = new BYTE[len]; // 24-bit color// Main message loopMSG msg = { 0 };while (msg.message != WM_QUIT){if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)){TranslateMessage(&msg);DispatchMessage(&msg);}else{// Capture the screen into bufferBitBlt(hMemDC, 0, 0, screenWidth, screenHeight, hDC, 0, 0, SRCCOPY);memcpy(screenBuffer, bBits, len); // Copy screen data to buffer// Get the device context of the windowHDC hWindowDC = GetDC(hwnd);// Create a compatible bitmap from buffer dataHBITMAP hBufferBitmap = CreateCompatibleBitmap(hWindowDC, screenWidth, screenHeight);HDC hBufferDC = CreateCompatibleDC(hWindowDC);SelectObject(hBufferDC, hBufferBitmap);// Copy buffer data into the bitmapSetDIBits(hBufferDC, hBufferBitmap, 0, screenHeight, screenBuffer, &bInfo, DIB_RGB_COLORS);// Scale and paint the buffered screen to fit the window sizeSetStretchBltMode(hWindowDC, HALFTONE);StretchBlt(hWindowDC, 0, 0, windowWidth, windowHeight, hBufferDC, 0, 0, screenWidth, screenHeight, SRCCOPY);// Clean upDeleteObject(hBufferBitmap);DeleteDC(hBufferDC);ReleaseDC(hwnd, hWindowDC);// Sleep for 0.2 seconds (200 milliseconds)Sleep(200);}}// Clean updelete[] screenBuffer;DeleteObject(hBitmap);DeleteDC(hMemDC);ReleaseDC(NULL, hDC);return 0;
}LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{switch (msg){case WM_DESTROY:PostQuitMessage(0);break;default:return DefWindowProc(hwnd, msg, wParam, lParam);}return 0;
}std::vector<int> getxy() {HWND hWnd = GetDesktopWindow();//根据需要可以替换成自己程序的句柄 HMONITOR hMonitor = MonitorFromWindow(hWnd, MONITOR_DEFAULTTONEAREST);DEVMODE dm;MONITORINFOEX miex;dm.dmSize = sizeof(dm);dm.dmDriverExtra = 0;miex.cbSize = sizeof(miex);GetMonitorInfo(hMonitor, &miex);// 获取监视器物理宽度与高度EnumDisplaySettings(miex.szDevice, ENUM_CURRENT_SETTINGS, &dm);int cxPhysical = dm.dmPelsWidth;int cyPhysical = dm.dmPelsHeight;vector<int> ret;ret.push_back(cxPhysical);ret.push_back(cyPhysical);return ret;
}

参数传递

// 发送结构体
xy data;
data.x = 10;
data.y = 20;
send(clientSocket, (char *) & data, sizeof(data), 0);//接受结构体xy data;recv(clientSocket, (char*) & data, sizeof(data), 0);std::cout << "Received: x = " << data.x << ", y = " << data.y << std::endl;

后记

BitBlt (Bit Block Transfer)

BitBlt 函数用于从一个设备上下文复制一个位图区域到另一个设备上下文。它不进行任何缩放操作，原样复制位图。通常用于在同一尺寸的区域之间移动或绘制位图。

函数原型：

cpp复制代码BOOL BitBlt(HDC   hdcDest,   // 目标设备上下文句柄int   nXDest,    // 目标矩形左上角的 X 坐标int   nYDest,    // 目标矩形左上角的 Y 坐标int   nWidth,    // 目标矩形的宽度int   nHeight,   // 目标矩形的高度HDC   hdcSrc,    // 源设备上下文句柄int   nXSrc,     // 源矩形左上角的 X 坐标int   nYSrc,     // 源矩形左上角的 Y 坐标DWORD dwRop      // 光栅操作代码
);

主要特性：

  • 复制图像：从源设备上下文复制图像到目标设备上下文，不进行缩放。
  • 位块传输：按照指定的矩形区域进行传输。

应用场景：

  • 同尺寸位图：适用于源和目标位图区域尺寸相同的情况下的快速复制操作。
  • 简单绘制：用于简单的图像绘制、窗口背景绘制等。

StretchBlt (Stretch Bit Block Transfer)

StretchBlt 函数与 BitBlt 类似，但它可以在复制位图时进行缩放。目标区域和源区域的大小可以不同，StretchBlt 会自动调整图像的尺寸，使之适应目标矩形。

函数原型：

cpp复制代码BOOL StretchBlt(HDC   hdcDest,     // 目标设备上下文句柄int   nXOriginDest,// 目标矩形左上角的 X 坐标int   nYOriginDest,// 目标矩形左上角的 Y 坐标int   nWidthDest,  // 目标矩形的宽度int   nHeightDest, // 目标矩形的高度HDC   hdcSrc,      // 源设备上下文句柄int   nXOriginSrc, // 源矩形左上角的 X 坐标int   nYOriginSrc, // 源矩形左上角的 Y 坐标int   nWidthSrc,   // 源矩形的宽度int   nHeightSrc,  // 源矩形的高度DWORD dwRop        // 光栅操作代码
);

主要特性：

  • 缩放图像：支持对位图进行缩放，目标区域可以比源区域大或小。
  • 比例变换：自动调整图像比例，使其适应目标区域。

应用场景：

  • 图像缩放：用于在图像渲染时需要缩放、拉伸或压缩的场景，如缩略图显示、窗口大小变化时的图像调整等。
  • 动态布局：在需要根据设备上下文的大小动态调整图像显示时，StretchBlt 是合适的选择。

总结

  • BitBlt：直接复制图像，不进行缩放，适合源和目标区域大小一致的情况下。
  • StretchBlt：支持缩放，在复制图像时根据需要调整尺寸，适合在不同大小区域之间传输图像的场景。

字符转化

class Char {
public:static std::wstring AtoW(const std::string& str){int wcLen = MultiByteToWideChar(CP_ACP, 0, str.c_str(), -1, NULL, 0);std::wstring newBuf;newBuf.resize(wcLen);MultiByteToWideChar(CP_ACP, 0, str.c_str(), -1, (LPWSTR)newBuf.c_str(), wcLen);return newBuf;}static std::string WtoA(const std::wstring& str){int cLen = WideCharToMultiByte(CP_ACP, 0, str.c_str(), -1, NULL, 0, 0, NULL);std::string newBuf;newBuf.resize(cLen);WideCharToMultiByte(CP_ACP, 0, str.c_str(), -1, (char*)newBuf.c_str(), cLen, 0, NULL);return newBuf;}
};

reference

https://geocld.github.io/2021/03/02/bmp/

这篇关于WIN32实现远程桌面监控的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！


http://www.chinasem.cn/article/1110229。

相关文章

python使用watchdog实现文件资源监控

python使用watchdog实现文件资源监控

《python使用watchdog实现文件资源监控》watchdog支持跨平台文件资源监控,可以检测指定文件夹下文件及文件夹变动,下面我们来看看Python如何使用watchdog实现文件资源监控吧... python文件监控库watchdogs简介随着Python在各种应用领域中的广泛使用，其生态环境也
阅读更多...
el-select下拉选择缓存的实现

el-select下拉选择缓存的实现

《el-select下拉选择缓存的实现》本文主要介绍了在使用el-select实现下拉选择缓存时遇到的问题及解决方案,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的... 目录项目场景：问题描述解决方案：项目场景：从左侧列表中选取字段填入右侧下拉多选框，用户可以对右侧
阅读更多...
Python pyinstaller实现图形化打包工具

Python pyinstaller实现图形化打包工具

《Pythonpyinstaller实现图形化打包工具》：本文主要介绍一个使用PythonPYQT5制作的关于pyinstaller打包工具,代替传统的cmd黑窗口模式打包页面,实现更快捷方便的... 目录1.简介2.运行效果3.相关源码1.简介一个使用python PYQT5制作的关于pyinstall
阅读更多...
使用Python实现大文件切片上传及断点续传的方法

使用Python实现大文件切片上传及断点续传的方法

《使用Python实现大文件切片上传及断点续传的方法》本文介绍了使用Python实现大文件切片上传及断点续传的方法,包括功能模块划分（获取上传文件接口状态、临时文件夹状态信息、切片上传、切片合并）、整... 目录概要整体架构流程技术细节获取上传文件状态接口获取临时文件夹状态信息接口切片上传功能文件合并功能小
阅读更多...
python实现自动登录12306自动抢票功能

python实现自动登录12306自动抢票功能

《python实现自动登录12306自动抢票功能》随着互联网技术的发展,越来越多的人选择通过网络平台购票,特别是在中国,12306作为官方火车票预订平台,承担了巨大的访问量,对于热门线路或者节假日出行... 目录一、遇到的问题？二、改进三、进阶–展望总结一、遇到的问题？1.url-正确的表头：就是首先ur
阅读更多...
C#实现文件读写到SQLite数据库

C#实现文件读写到SQLite数据库

《C#实现文件读写到SQLite数据库》这篇文章主要为大家详细介绍了使用C#将文件读写到SQLite数据库的几种方法,文中的示例代码讲解详细,感兴趣的小伙伴可以参考一下... 目录1. 使用 BLOB 存储文件2. 存储文件路径3. 分块存储文件《文件读写到SQLite数据库China编程的方法》博客中，介绍了文
阅读更多...
Redis主从复制实现原理分析

Redis主从复制实现原理分析

《Redis主从复制实现原理分析》Redis主从复制通过Sync和CommandPropagate阶段实现数据同步,2.8版本后引入Psync指令,根据复制偏移量进行全量或部分同步,优化了数据传输效率... 目录Redis主DodMIK从复制实现原理实现原理Psync: 2.8版本后总结Redis主从复制实
阅读更多...
JAVA利用顺序表实现“杨辉三角”的思路及代码示例

JAVA利用顺序表实现“杨辉三角”的思路及代码示例

《JAVA利用顺序表实现“杨辉三角”的思路及代码示例》杨辉三角形是中国古代数学的杰出研究成果之一,是我国北宋数学家贾宪于1050年首先发现并使用的,：本文主要介绍JAVA利用顺序表实现杨辉三角的思... 目录一：“杨辉三角”题目链接二：题解代码：三：题解思路：总结一：“杨辉三角”题目链接题目链接：点击这里
阅读更多...
基于Python实现PDF动画翻页效果的阅读器

基于Python实现PDF动画翻页效果的阅读器

《基于Python实现PDF动画翻页效果的阅读器》在这篇博客中,我们将深入分析一个基于wxPython实现的PDF阅读器程序,该程序支持加载PDF文件并显示页面内容,同时支持页面切换动画效果,文中有详... 目录全部代码代码结构初始化 UI 界面加载 PDF 文件显示 PDF 页面页面切换动画运行效果总结主
阅读更多...
SpringBoot实现基于URL和IP的访问频率限制

SpringBoot实现基于URL和IP的访问频率限制

《SpringBoot实现基于URL和IP的访问频率限制》在现代Web应用中,接口被恶意刷新或暴力请求是一种常见的攻击手段,为了保护系统资源,需要对接口的访问频率进行限制,下面我们就来看看如何使用... 目录1. 引言2. 项目依赖3. 配置 Redis4. 创建拦截器5. 注册拦截器6. 创建控制器8.
阅读更多...

Copyright China编程 23002807@qq.com

沪ICP备2023033072号-2