dwm的尝试

dwmapi的出现已不是什么新鲜的事情，早在2006年VISTA推出时就已经有了吧，但是那是我显然还不会编程。而时至今日，这方面的例子还不是很充分，虽然网上有一些例子，但都不是我所想要的简简单单的例子。而且例子大都是来自codeproject上的。我在那个网站上找过一些dwm的demo，印象最深，一直留着的是unmanaged C++ power，因为我也不是很喜欢managed c++。可是那是没有看的明白，今天整理电脑，又将其翻出来看了看，发现与dwm有关的只有一条DwmExtendFrameIntoClientArea(hwnd, &g_mgDWMMargins);虽然这个我早就在网上查到过，但是由于没有体验过，所以还不能说明问题，这回有机会体验了一下，效果不错啊。

#include <windows.h> #include <dwmapi.h> MARGINS g_mgDWMMargins = {-1, -1, -1, -1}; /* Declare Windows procedure */ LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM); /* Make the class name into a global variable */ char szClassName[ ] = "CodeBlocksWindowsApp"; int WINAPI WinMain (HINSTANCE hThisInstance, HINSTANCE hPrevInstance, LPSTR lpszArgument, int nCmdShow) { HWND hwnd; /* This is the handle for our window */ MSG messages; /* Here messages to the application are saved */ WNDCLASSEX wincl; /* Data structure for the windowclass */ /* The Window structure */ wincl.hInstance = hThisInstance; wincl.lpszClassName = szClassName; wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */ wincl.style = CS_DBLCLKS; /* Catch double-clicks */ wincl.cbSize = sizeof (WNDCLASSEX); /* Use default icon and mouse-pointer */ wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION); wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION); wincl.hCursor = LoadCursor (NULL, IDC_ARROW); wincl.lpszMenuName = NULL; /* No menu */ wincl.cbClsExtra = 0; /* No extra bytes after the window class */ wincl.cbWndExtra = 0; /* structure or the window instance */ /* Use Windows's default colour as the background of the window */ wincl.hbrBackground = CreateSolidBrush(RGB(0,0,0)); /* Register the window class, and if it fails quit the program */ if (!RegisterClassEx (&wincl)) return 0; /* The class is registered, let's create the program*/ hwnd = CreateWindowEx ( 0, /* Extended possibilites for variation */ szClassName, /* Classname */ "AeroWindow", /* Title Text */ WS_OVERLAPPEDWINDOW, /* default window */ CW_USEDEFAULT, /* Windows decides the position */ CW_USEDEFAULT, /* where the window ends up on the screen */ 544, /* The programs width */ 375, /* and height in pixels */ HWND_DESKTOP, /* The window is a child-window to desktop */ NULL, /* No menu */ hThisInstance, /* Program Instance handler */ NULL /* No Window Creation data */ ); /* Make the window visible on the screen */ DwmExtendFrameIntoClientArea(hwnd, &g_mgDWMMargins); ShowWindow (hwnd, nCmdShow); /* Run the message loop. It will run until GetMessage() returns 0 */ while (GetMessage (&messages, NULL, 0, 0)) { /* Translate virtual-key messages into character messages */ TranslateMessage(&messages); /* Send message to WindowProcedure */ DispatchMessage(&messages); } /* The program return-value is 0 - The value that PostQuitMessage() gave */ return messages.wParam; } /* This function is called by the Windows function DispatchMessage() */ LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { switch (message) /* handle the messages */ { case WM_DESTROY: PostQuitMessage (0); /* send a WM_QUIT to the message queue */ break; default: /* for messages that we don't deal with */ return DefWindowProc (hwnd, message, wParam, lParam); } return 0; }

如你所见，大部分都是来自codeblocks的模板，我只是将DWM的部分加入了。编译的时候要用cl编译器，因为MINGW中还没有假如相关的库函数，不过应该可以用GCC中的工具将.lib转换成.o或.a但是我没有进行尝试，同时我用.c做扩展名，也是会出现问题的，似乎cl更加是一个c++的编译器，编译的命令是cl aerwindow.cpp user32.lib dwmapi.lib gdi32.lib

gdi32.lib是为了CreateSolidBrush函数加入的。因为我们需要将背景清城黑色才能显示为完全的AERO效果，否则似乎只是针对个别的颜色有效，我不太清楚windows对这些颜色进行了如何的处理，所以先这么的吧，哈哈。