VC++6.0：有趣的编程代码分享 |21xrx.com

VC++6.0：有趣的编程代码分享

2023-07-12 13:01:14 深夜i -- --

VC++ 编程代码分享有趣

VC++6.0是一款非常经典的编程工具，它可以帮助我们简单有效地开发高质量的Windows程序。我们可以使用它来实现各种各样的功能，包括图像处理、网络通讯、文件操作等等。而今天，我们就来分享一些有趣的VC++6.0编程代码，帮助大家更好地了解这个经典的编程工具。

1.图像操作

VC++6.0提供了非常丰富的图像操作功能，我们可以使用它来加载、显示、修改图像等。比如下面这段代码展示了如何在VC++6.0中加载一张bmp格式的图片，并显示出来：


#include <windows.h>
#include <iostream>
#include <string>
#include <algorithm>
#pragma comment(lib,"Gdi32.lib")
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
void ProcessMsg(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
void Cleanup();
HWND g_hWnd;
HINSTANCE hInst;
HBITMAP hBitmap;
HDC hMemDC;
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
  LPSTR lpCmdLine, int nCmdShow)
{
  hInst = hInstance;
  // Register the window class.
  const char CLASS_NAME[] = "Sample Window Class";
  WNDCLASS wc = {};
  wc.lpfnWndProc = WndProc;
  wc.hInstance = hInstance;
  wc.lpszClassName = CLASS_NAME;
  wc.hCursor = LoadCursor(nullptr, IDC_ARROW);
  RegisterClass(&wc);
  //Create the window
  HWND hWnd = CreateWindowEx(
    0,
    CLASS_NAME,
    "Sample Window",
    WS_OVERLAPPEDWINDOW,
    CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
    nullptr, nullptr, hInstance, nullptr
  );
  if (hWnd == nullptr)
  
    return 0;
  
  g_hWnd = hWnd;
  ShowWindow(hWnd, nCmdShow);
  //Load the bitmap
  hBitmap = (HBITMAP)LoadImage(hInstance, "img.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
  if (!hBitmap)
  {
    MessageBox(g_hWnd, "Failed to load image", "Error", MB_OK);
    return 0;
  }
  //Create the memory DC
  HDC dc = GetDC(hWnd);
  hMemDC = CreateCompatibleDC(dc);
  ReleaseDC(hWnd, dc);
  selectObject(hMemDC, hBitmap);
  // Run the message loop.
  MSG msg = {};
  while (GetMessage(&msg, nullptr, 0, 0))
  {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }
  Cleanup();
  return 0;
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
  ProcessMsg(hWnd, message, wParam, lParam);
  return DefWindowProc(hWnd, message, wParam, lParam);
}
void ProcessMsg(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
  switch (message)
  {
  case WM_PAINT:
  {
    PAINTSTRUCT ps;
    HDC hdc = BeginPaint(hWnd, &ps);
    BitBlt(hdc, 0, 0, 600, 800, hMemDC, 0, 0, SRCCOPY);
    EndPaint(hWnd, &ps);
  }
  break;
  case WM_DESTROY:
  {
    PostQuitMessage(0);
  }
  break;
  default:
    break;
  }
}
void Cleanup()
{
  DeleteObject(hBitmap);
  DeleteDC(hMemDC);
}

2.网络通讯

VC++6.0支持多种常用的网络通讯协议，包括TCP、UDP等。我们可以使用它来编写各种网络应用程序，比如HTTP服务器、FTP客户端等等。下面这段代码展示了如何使用VC++6.0编写一个基于Winsock2的TCP客户端：


#include <stdio.h>
#include <stdlib.h>
#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib")
int main(int argc, char* argv[])
{
  //Initialise Winsock
  WSADATA wsData;
  int error;
  if ((error = WSAStartup(MAKEWORD(2, 2), &wsData)) != 0)
  {
    printf("Failed to initialise Winsock: %d\n", error);
    return 1;
  }
  //Create a socket to connect to the server
  SOCKET clientSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  if (clientSocket == INVALID_SOCKET)
  {
    printf("Failed to create socket: %d\n", WSAGetLastError());
    WSACleanup();
    return 1;
  }
  //Connect to the server
  SOCKADDR_IN serverAddr;
  serverAddr.sin_family = AF_INET;
  serverAddr.sin_port = htons(80);
  serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1"); //"127.0.0.1"为服务器IP地址
  if (connect(clientSocket, (SOCKADDR*)&serverAddr, sizeof(serverAddr)) < 0)
  {
    printf("Failed to connect to server: %d\n", WSAGetLastError());
    closesocket(clientSocket);
    WSACleanup();
    return 1;
  }
  //Send a request to the server
  char request[] = "GET / HTTP/1.1\r\nHost: 127.0.0.1\r\n\r\n";
  send(clientSocket, request, sizeof(request), 0);
  //Receive the response from the server
  char buffer[4096];
  int receivedBytes = 0;
  while ((receivedBytes = recv(clientSocket, buffer, sizeof(buffer), 0)) > 0)
  {
    buffer[receivedBytes] = '\0';
    printf("%s", buffer);
  }
  //Close the connection
  closesocket(clientSocket);
  WSACleanup();
  return 0;
}

3.文件操作

VC++6.0也支持各种各样的文件操作，包括文件读写、文件拷贝、文件压缩等等。下面这段代码展示了如何使用VC++6.0编写一个读取文本文件的程序：


#include <stdio.h>
#include <stdlib.h>
int main(int argc, char* argv[])
{
  if (argc < 2)
  {
    printf("Usage: %s <filename>\n", argv[0]);
    return 1;
  }
  //Open the file
  FILE* fp = fopen(argv[1], "r");
  if (fp == NULL)
  {
    printf("Failed to open file: %s\n", argv[1]);
    return 1;
  }
  //Get the file size
  fseek(fp, 0, SEEK_END);
  long fileSize = ftell(fp);
  rewind(fp);
  //Read the file
  char* fileBuffer = (char*)malloc(fileSize + 1);
  fread(fileBuffer, 1, fileSize, fp);
  fileBuffer[fileSize] = '\0';
  //Print the file content
  printf("%s", fileBuffer);
  //Cleanup
  free(fileBuffer);
  fclose(fp);
  return 0;
}

以上这些代码只是VC++6.0比较常见的应用，VC++6.0可以做的事情远不止这些。希望这些代码对大家有所启发，让大家更好地了解和使用VC++6.0这个经典的编程工具。

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