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我正在寫的一個GUI應用程序確實發送了一個keydown事件到另一個窗口cmd.exe
。爲什麼從全局熱鍵處理程序中調用PostMessage時無效?
PostMessage(hwnd, WM_KEYDOWN, VK_RETURN, 0);
該事件時,它的對事件做這樣WM_CREATE
,WM_KEYUP
等(新線出現在cmd.exe
)發送就好了。
然後我用RegisterHotKey
設置了一個全局熱鍵。在WM_HOTKEY
處理程序中,我成功接收了按鍵,但PostMessage
已無效。
如何解決這個問題?
完整的示例,精縮地:
#include <iostream>
#include <Windows.h>
using namespace std;
const char g_szClassName[] = "myWindowClass";
BOOL CALLBACK enumWindows(HWND hwnd, LPARAM lParam) {
char winTitle[1024*10];
GetWindowText(hwnd, winTitle, sizeof(winTitle));
if (strstr(winTitle, "cmd.exe") != NULL) {
cout << "Sending a message to window " << hwnd << ": " << winTitle << endl;
PostMessage(hwnd, WM_KEYDOWN, VK_RETURN, 0);
}
return TRUE;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
switch(msg) {
case WM_CREATE:
// register hotkey ctrl+alt+s
RegisterHotKey(hwnd, 100, MOD_ALT | MOD_CONTROL, 'S');
break;
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
EnumWindows(enumWindows, 0);
PostQuitMessage(0);
break;
case WM_HOTKEY:
// hotkey ctrl+alt+s fired
EnumWindows(enumWindows, 0);
break;
case WM_KEYUP:
EnumWindows(enumWindows, 0);
break;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}
// just init stuff, do not waste your time
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
WNDCLASSEX wc;
HWND hwnd;
MSG Msg;
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wc.lpszMenuName = NULL;
wc.lpszClassName = g_szClassName;
wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
RegisterClassEx(&wc);
hwnd = CreateWindowEx(WS_EX_CLIENTEDGE, g_szClassName, "Test", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 240, 120, NULL, NULL, hInstance, NULL);
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&Msg, NULL, 0, 0) > 0) {
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}
的Windows 7 64位
也許'WM_KEYDOWN'處理程序檢查其他鍵的狀態,這是在瞬間的熱鍵火災鬱悶? –
僞造輸入,並做錯了,是的,錯了。使用官方自動化界面可能會取得更好的成功:[UI自動化](https://msdn.microsoft.com/en-us/library/windows/desktop/ee684009.aspx)。 – IInspectable