SetBkMode与SetBkColor的区别(代码搞定一切!!)
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#include<windows.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
PSTR szCmdLine,
int iCmdShow){
static TCHAR szAppName[]= TEXT("MyPen");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(GRAY_BRUSH);
wndclass.lpszMenuName =NULL;
wndclass.lpszClassName = szAppName;
if(!RegisterClass(&wndclass)){
MessageBox(NULL, TEXT("Register failure..."),
szAppName, MB_ICONERROR);
return 0;
}
hwnd = CreateWindow(szAppName,
szAppName,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL);
ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&msg,NULL, 0, 0)){
DispatchMessage(&msg);
TranslateMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd,
UINT message,
WPARAM wParam,
LPARAM lParam){
static int cxClient, cyClient, i;
HDC hdc;
PAINTSTRUCT ps;
HPEN hPen;
LOGPEN logPen;
switch(message){
case WM_SIZE:
cxClient = LOWORD(lParam);
cyClient = HIWORD(lParam);
i = 0;
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd,&ps);
SetBkColor(hdc, RGB(0, 255, 255));
// 注释运行和不注释它运行
// SetBkMode(hdc, TRANSPARENT);//若为OPAQUE标志则与上面一样
switch(i){
case 0:
hPen = CreatePen(PS_SOLID, 2, RGB(10, 10, 10));
break;
case 1:
hPen = CreatePen(PS_DASH, 1, RGB(20, 20, 20));
break;
case 2:
hPen = CreatePen(PS_DOT, 1, RGB(255, 30, 30));
break;
case 3:
hPen = CreatePen(PS_DASHDOT, 1, RGB(40, 40, 40));
break;
case 4:
hPen = CreatePen(PS_DASHDOTDOT, 1, RGB(50, 50, 50));
break;
case 5:
logPen.lopnStyle = PS_SOLID;
logPen.lopnColor = RGB(0, 60, 60);
/*
* 此处是非常有意思的,下面有说明
*/
logPen.lopnWidth.x = 5;
hPen = CreatePenIndirect(&logPen);
break;
default:
hPen =(HPEN) GetStockObject(BLACK_PEN);
break;
}
SelectObject(hdc, hPen);
MoveToEx(hdc, 0,(i + 1)* cyClient / 10,NULL);
LineTo(hdc, cxClient,(i + 1)* cyClient / 10);
TextOut(hdc, i* cxClient / 7, 4 * cyClient / 5,"windows", lstrlen("windows"));
if(i++<= 5)
InvalidateRect(hwnd,NULL,FALSE);
EndPaint(hwnd, &ps);
// 删除GDI对象, 释放内存!!
DeleteObject(hPen);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
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