正如其他人所建议的那样，这是 Windows 的预期行为，并且有充分的理由。
此外，您至少不能依赖 SumatraPDF 的默认窗口放置，因为它肯定不使用 CW_USEDEFAULT，而是将这些值存储在：
%USERPROFILE%\AppData\Roaming\SumatraPDF\SumatraPDF-settings.txt
虽然有多种选择：
- 使用第三方工具监控顶级窗口，并根据预先配置的规则将它们移动到指定的显示。例如。 DisplayFusion 等。
- 使用重量更轻的解决方案，例如 AutoHotkey/AutoIt。
- 尝试在代码本身中执行此操作。以下是一个工作解决方案。我在我的盒子上进行了吸烟测试。
免责声明：我没有编写完整的代码，为了节省时间，我从几个来源中提取了它，对其进行了调整，将其粘合在一起，并使用 SumantraPDF 进行了测试。另请注意，此代码不是最高标准，但可以解决您的问题，并将作为一个可行的示例。
C++ 代码：（向下滚动查看 C# 代码）
#include <Windows.h>
#include <vector>
// 0 based index for preferred monitor
static const int PREFERRED_MONITOR = 1;
struct ProcessWindowsInfo
{
DWORD ProcessID;
std::vector<HWND> Windows;
ProcessWindowsInfo(DWORD const AProcessID)
: ProcessID(AProcessID)
{
}
};
struct MonitorInfo
{
HMONITOR hMonitor;
RECT rect;
};
BOOL WINAPI EnumProcessWindowsProc(HWND hwnd, LPARAM lParam)
{
ProcessWindowsInfo *info = reinterpret_cast<ProcessWindowsInfo*>(lParam);
DWORD WindowProcessID;
GetWindowThreadProcessId(hwnd, &WindowProcessID);
if (WindowProcessID == info->ProcessID)
{
if (GetWindow(hwnd, GW_OWNER) == (HWND)0 && IsWindowVisible(hwnd))
{
info->Windows.push_back(hwnd);
}
}
return true;
}
BOOL CALLBACK Monitorenumproc(HMONITOR hMonitor, HDC hdc, LPRECT lprect, LPARAM lParam)
{
std::vector<MonitorInfo> *info = reinterpret_cast<std::vector<MonitorInfo>*>(lParam);
MonitorInfo monitorInfo = { 0 };
monitorInfo.hMonitor = hMonitor;
monitorInfo.rect = *lprect;
info->push_back(monitorInfo);
return TRUE;
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
// NOTE: for now this code works only when the window is not already visible
// could be easily modified to terminate existing process as required
SHELLEXECUTEINFO info = { 0 };
info.cbSize = sizeof(info);
info.fMask = SEE_MASK_NOCLOSEPROCESS;
info.lpFile = L"C:\\Program Files\\SumatraPDF\\SumatraPDF.exe";
info.nShow = SW_SHOW;
std::vector<MonitorInfo> connectedMonitors;
// Get all available displays
EnumDisplayMonitors(NULL, NULL, Monitorenumproc, reinterpret_cast<LPARAM>(&connectedMonitors));
if (ShellExecuteEx(&info))
{
WaitForInputIdle(info.hProcess, INFINITE);
ProcessWindowsInfo Info(GetProcessId(info.hProcess));
// Go though all windows from that process
EnumWindows((WNDENUMPROC)EnumProcessWindowsProc, reinterpret_cast<LPARAM>(&Info.ProcessID));
if (Info.Windows.size() == 1)
{
// only if we got at most 1 window
// NOTE: applications can have more than 1 top level window. But at least for SumtraPDF this works!
if (connectedMonitors.size() >= PREFERRED_MONITOR)
{
// only move the window if we were able to successfully detect available monitors
SetWindowPos(Info.Windows.at(0), 0, connectedMonitors.at(PREFERRED_MONITOR).rect.left, connectedMonitors.at(PREFERRED_MONITOR).rect.top, 0, 0, SWP_NOSIZE | SWP_NOZORDER);
}
}
CloseHandle(info.hProcess);
}
return 0;
}
在代码中强调我的一个 cmets。 此代码仅在相关进程尚未运行时才有效。否则，您可以根据自己的要求调整代码。
更新：在下面添加了 C# 代码，因为我意识到 OP 更喜欢 C#。此代码还包含终止逻辑。
C# 代码：
[DllImport("user32.dll", SetLastError = true)]
private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, int uFlags);
private const int SWP_NOSIZE = 0x0001;
private const int SWP_NOZORDER = 0x0004;
private const int PREFERRED_MONITOR = 1;
static void Main(string[] args)
{
// NOTE: you will have to reference System.Windows.Forms and System.Drawing (or
// equivalent WPF assemblies) for Screen and Rectangle
// Terminate existing SumatraPDF process, else we will not get the MainWindowHandle by following method.
List<Process> existingProcesses = Process.GetProcessesByName("SumatraPDF").ToList();
foreach (var existingProcess in existingProcesses)
{
// Ouch! Ruthlessly kill the existing SumatraPDF instances
existingProcess.Kill();
}
// Start the new instance of SumantraPDF
Process process = Process.Start(@"C:\Program Files\SumatraPDF\SumatraPDF.exe");
// wait max 5 seconds for process to be active
process.WaitForInputIdle(5000);
if (Screen.AllScreens.Length >= PREFERRED_MONITOR)
{
SetWindowPos(process.MainWindowHandle,
IntPtr.Zero,
Screen.AllScreens[PREFERRED_MONITOR].WorkingArea.Left,
Screen.AllScreens[PREFERRED_MONITOR].WorkingArea.Top,
0, 0, SWP_NOSIZE | SWP_NOZORDER);
}
}