c++多显示器屏幕截图代码

以下是在C语言中实现多显示器屏幕截图的代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <Windows.h>

int main()
{
    // 获取所有显示器的句柄
    int numMonitors = GetSystemMetrics(SM_CMONITORS);
    HMONITOR* hMonitors = (HMONITOR*)malloc(numMonitors * sizeof(HMONITOR));
    EnumDisplayMonitors(NULL, NULL, MonitorEnumCallback, (LPARAM)hMonitors);

    // 截取每个显示器的屏幕并保存为文件
    for (int i = 0; i < numMonitors; i++)
    {
        HDC hDC = CreateDC(NULL, MonitorDevicePath(hMonitors[i]), NULL, NULL);
        RECT rect;
        GetMonitorRect(hMonitors[i], &rect);
        HBITMAP hBitmap = CreateCompatibleBitmap(hDC, rect.right - rect.left, rect.bottom - rect.top);
        HDC hMemDC = CreateCompatibleDC(hDC);
        HGDIOBJ hOldObject = SelectObject(hMemDC, hBitmap);
        BitBlt(hMemDC, 0, 0, rect.right - rect.left, rect.bottom - rect.top, hDC, 0, 0, SRCCOPY);
        SelectObject(hMemDC, hOldObject);
        DeleteDC(hMemDC);
        SaveBitmapToFile(hBitmap, i);
        DeleteObject(hBitmap);
        DeleteDC(hDC);
    }

    free(hMonitors);
    return 0;
}

BOOL CALLBACK MonitorEnumCallback(HMONITOR hMonitor, HDC hdcMonitor, LPRECT lprcMonitor, LPARAM dwData)
{
    HMONITOR* hMonitors = (HMONITOR*)dwData;
    int index = GetMonitorCount(hMonitors);
    hMonitors[index] = hMonitor;
    return TRUE;
}

int GetMonitorCount(HMONITOR* hMonitors)
{
    int count = 0;
    while (hMonitors[count] != NULL)
    {
        count++;
    }
    return count;
}

TCHAR* MonitorDevicePath(HMONITOR hMonitor)
{
    MONITORINFOEX monitorInfo;
    monitorInfo.cbSize = sizeof(MONITORINFOEX);
    GetMonitorInfo(hMonitor, &monitorInfo);
    return monitorInfo.szDevice;
}

void GetMonitorRect(HMONITOR hMonitor, LPRECT lpRect)
{
    MONITORINFOEX monitorInfo;
    monitorInfo.cbSize = sizeof(MONITORINFOEX);
    GetMonitorInfo(hMonitor, &monitorInfo);
    *lpRect = monitorInfo.rcMonitor;
}

void SaveBitmapToFile(HBITMAP hBitmap, int index)
{
    TCHAR fileName[256];
    wsprintf(fileName, TEXT("screenshot%d.bmp"), index);
    HANDLE hFile = CreateFile(fileName, GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    BITMAPFILEHEADER bmpFileHeader;
    BITMAPINFO bmpInfo;
    BITMAP bmp;
    GetObject(hBitmap, sizeof(BITMAP), &bmp);
    bmpInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    bmpInfo.bmiHeader.biWidth = bmp.bmWidth;
    bmpInfo.bmiHeader.biHeight = bmp.bmHeight;
    bmpInfo.bmiHeader.biPlanes = 1;
    bmpInfo.bmiHeader.biBitCount = bmp.bmBitsPixel;
    bmpInfo.bmiHeader.biCompression = BI_RGB;
    bmpInfo.bmiHeader.biSizeImage = bmp.bmWidthBytes * bmp.bmHeight;
    bmpInfo.bmiHeader.biXPelsPerMeter = 0;
    bmpInfo.bmiHeader.biYPelsPerMeter = 0;
    bmpInfo.bmiHeader.biClrUsed = 0;
    bmpInfo.bmiHeader.biClrImportant = 0;
    bmpFileHeader.bfType = 0x4d42;
    bmpFileHeader.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + bmp.bmWidthBytes * bmp.bmHeight;
    bmpFileHeader.bfReserved1 = 0;
    bmpFileHeader.bfReserved2 = 0;
    bmpFileHeader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
    DWORD bytesWritten;
    WriteFile(hFile, &bmpFileHeader, sizeof(BITMAPFILEHEADER), &bytesWritten, NULL);
    WriteFile(hFile, &bmpInfo.bmiHeader, sizeof(BITMAPINFOHEADER), &bytesWritten, NULL);
    WriteFile(hFile, bmp.bmBits, bmp.bmWidthBytes * bmp.bmHeight, &bytesWritten, NULL);
    CloseHandle(hFile);
}