我结束了运行到很多的问题,同时努力使这项工作。如果有人最终访问此页面寻找对我遇到的同样问题的答案,我希望你比我有更容易的时间。这是我的代码:
#include <Windows.h>
INT WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR lpCmdLine, INT nCmdShow)
{
// Define and initialize variables
HDC hdc;
HDC hdcMem;
HBITMAP hbmMem;
HANDLE hOld;
RECT rect;
SIZE sz;
int win_width = 0;
int win_height = 0;
int font_size = 20;
int location_x = 40;
int location_y = 40;
int border = font_size/4;
int duration = 10000; // In miliseconds. The notification will always stay up more time
wchar_t* font_face = L"Consolas";
wchar_t message[100];
// Save command-line arguments to message; They are showed by the notification
MultiByteToWideChar(0, 0,
lpCmdLine,
strlen(lpCmdLine),
message,
100
);
message[strlen(lpCmdLine)] = L'\0';
// Acquire screen
hdc = ::GetDC(0);
//Create necessary font
HFONT hFont = CreateFont(font_size, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, font_face);
HFONT hTmp = (HFONT)SelectObject(hdc, hFont);
// Calculate size of the text
GetTextExtentPoint32(hdc, message, wcslen(message), &sz);
win_width = sz.cx;
win_height = sz.cy;
rect = { 0, 0, sz.cx, sz.cx };
// Create an off-screen DC for double-buffering
hdcMem = CreateCompatibleDC(hdc);
hbmMem = CreateCompatibleBitmap(hdc, win_width + 2 * border, win_height + 2 * border);
// Configure off-screen DC
SetBkMode(hdcMem, OPAQUE);
SetTextColor(hdcMem, RGB(125, 125, 255));
SetBkColor(hdcMem, RGB(0, 0, 0));
SelectObject(hdcMem, hFont);
hOld = SelectObject(hdcMem, hbmMem);
// Draw loop
for (int i = 0; i < duration; i++)
{
// Draw into hdcMem
DrawText(hdcMem, message, -1, &rect, DT_SINGLELINE);
// Transfer the off-screen DC to the screen
BitBlt(hdc, location_x, location_y, win_width + 2 * border, win_height + 2 * border, hdcMem, -5, -5, SRCCOPY);
// Don't eat all the cpu!
Sleep(1);
}
// Delete notification right after time expires
::InvalidateRect(0, &rect, false);
::UpdateWindow(0);
// Free-up the off-screen DC
SelectObject(hdcMem, hOld);
DeleteObject(hbmMem);
DeleteDC(hdcMem);
// Release created objects
DeleteObject(SelectObject(hdc, hTmp));
::ReleaseDC(0, hdc);
return 0;
}
它仍然可以改善,很多。唯一出现的是带有通知的矩形。 您传递给程序的参数将显示为消息。与hdcMem
相关的所有内容都已实施,以避免闪烁。我还不能改变更大矩形的背景。
您正在主设备上下文中绘图。 – mudasobwa 2014-12-03 11:58:56
@mudasobwa你能否澄清你的评论?那是什么意思? – SlySherZ 2014-12-03 12:00:09
“这个想法是能够显示通知。”自定义通知系统非常糟糕,最好不要收到任何通知。当你的操作系统支持一个内置的系统通知机制(如Windows 10)就可以使用它。 – bames53 2014-12-03 12:01:57