#include <windows.h>LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);LRESULT CALLBACK PanelProc(HWND, UINT, WPARAM, LPARAM);void RegisterPanel(void);COLORREF ShowColorDialog(HWND); // COLORREF 就是个DWORD // typedef DWORD COLORREF;COLORREF gColor = RGB(255, 255, 255);int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow ){ MSG msg ; WNDCLASS wc = {0}; wc.lpszClassName = TEXT( "Color dialog box" ); wc.hInstance = hInstance ; wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE); wc.lpfnWndProc = WndProc ; RegisterClass(&wc); CreateWindow( wc.lpszClassName, TEXT("Color dialog box"), WS_OVERLAPPEDWINDOW | WS_VISIBLE, 150, 150, 250, 200, 0, 0, hInstance, 0); while( GetMessage(&msg, NULL, 0, 0)) { DispatchMessage(&msg); } return (int) msg.wParam;}LRESULT CALLBACK WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam ){ static HWND hwndPanel; switch(msg) { case WM_CREATE: { CreateWindow(TEXT("button"), TEXT("Color"), WS_VISIBLE | WS_CHILD , 20, 30, 80, 25, hwnd, (HMENU) 1, NULL, NULL);// hwnd 父窗口 RegisterPanel(); hwndPanel = CreateWindow(TEXT("Panel"), NULL, WS_CHILD | WS_VISIBLE, 130, 30, 80, 80, hwnd, (HMENU) 2, NULL, NULL); // hwnd 父窗口 break;}case WM_COMMAND: // 什么情形下产生这种消息?{ gColor = ShowColorDialog(hwnd); // 调用调色板对话框 InvalidateRect(hwndPanel, NULL, TRUE); break;} case WM_DESTROY: { PostQuitMessage(0); break; } } return DefWindowProc(hwnd, msg, wParam, lParam);}LRESULT CALLBACK PanelProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam ){ HDC hdc; PAINTSTRUCT ps; RECT rect; switch(msg) { case WM_PAINT: { GetClientRect(hwnd, &rect); hdc = BeginPaint(hwnd, &ps); SetBkColor(hdc, gColor); ExtTextOut(hdc, 0, 0, ETO_OPAQUE, &rect, TEXT(""), 0, NULL); EndPaint(hwnd, &ps); break; } } return DefWindowProc(hwnd, msg, wParam, lParam);}COLORREF ShowColorDialog(HWND hwnd) { CHOOSECOLOR cc; static COLORREF crCustClr[16]; ZeroMemory(&cc, sizeof(cc)); cc.lStructSize = sizeof(cc); cc.hwndOwner = hwnd; cc.lpCustColors = (LPDWORD) crCustClr; cc.rgbResult = RGB(0, 255, 0); cc.Flags = CC_FULLOPEN | CC_RGBINIT; ChooseColor(&cc); return cc.rgbResult;}void RegisterPanel(void) { WNDCLASS rwc = {0}; rwc.lpszClassName = TEXT( "Panel" ); rwc.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH); rwc.lpfnWndProc = PanelProc; RegisterClass(&rwc);}
