本意用for循环显示6个阴影线画刷，颜色随机，但是显示错误,Windows程序设计,技术交流,鱼C论坛

abc75727 发表于 2015-6-1 17:27:09

本意用for循环显示6个阴影线画刷，颜色随机，但是显示错误

#include <windows.h>
#include <stdlib.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
               PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("HelloWin") ;
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 (WHITE_BRUSH) ;
wndclass.lpszMenuName= NULL ;
wndclass.lpszClassName = szAppName ;

if (!RegisterClass (&wndclass))
{
      MessageBox (NULL, TEXT ("This program requires Windows NT!"),
                  szAppName, MB_ICONERROR) ;
      return 0 ;
}

hwnd = CreateWindow (szAppName,                // window class name
                     TEXT ("The Hello Program"), // window caption
                     WS_OVERLAPPEDWINDOW,    // window style
                     CW_USEDEFAULT,          // initial x position
                     CW_USEDEFAULT,          // initial y position
                     CW_USEDEFAULT,          // initial x size
                     CW_USEDEFAULT,          // initial y size
                     NULL,                   // parent window handle
                     NULL,                   // window menu handle
                     hInstance,                // program instance handle
                     NULL) ;                   // creation parameters

ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;

while (GetMessage (&msg, NULL, 0, 0))
{
      TranslateMessage (&msg) ;
      DispatchMessage (&msg) ;
}
return msg.wParam ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC       hdc ;
HBRUSH hbrush;
int cxclient, cyclient;
int i;
PAINTSTRUCT ps;
srand((unsigned)time(NULL));
int apt = { HS_HORIZONTAL, HS_BDIAGONAL, HS_VERTICAL, HS_CROSS, HS_FDIAGONAL, HS_DIAGCROSS };
switch (message)
{
case WM_CREATE:
cxclient = LOWORD(lParam);
cyclient = HIWORD(lParam);
      return 0 ;

case WM_PAINT:
      hdc = BeginPaint (hwnd, &ps) ;
   for (i = 0; i < 6;i++)
   {
   SelectObject(hdc, CreateHatchBrush(apt, RGB(rand() % 256, rand() % 256, rand() % 256)));
   Rectangle(hdc, cxclient*i / 6, cyclient / 8, cxclient * (i+1) / 6, cyclient * 7 /8);
   }
      EndPaint (hwnd, &ps) ;
      return 0 ;

case WM_DESTROY:
      PostQuitMessage (0) ;
      return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}

abc75727 发表于 2015-6-1 17:42:36

我又改进了下，还是不对。。。#include <windows.h>
#include <stdlib.h>
#include<time.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT("HelloWin");
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(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;

if (!RegisterClass(&wndclass))
{
MessageBox(NULL, TEXT("This program requires Windows NT!"),
szAppName, MB_ICONERROR);
return 0;
}

hwnd = CreateWindow(szAppName,                // window class name
TEXT("The Hello Program"), // window caption
WS_OVERLAPPEDWINDOW,    // window style
CW_USEDEFAULT,          // initial x position
CW_USEDEFAULT,          // initial y position
CW_USEDEFAULT,          // initial x size
CW_USEDEFAULT,          // initial y size
NULL,                   // parent window handle
NULL,                   // window menu handle
hInstance,                // program instance handle
NULL);                   // creation parameters

ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);

while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC       hdc;
HBRUSH hbrush;
static int cxclient, cyclient;
int i;
PAINTSTRUCT ps;
srand((unsigned)time(NULL));
COLORREF color = { RGB(rand() % 256, rand() % 256, rand() % 256), RGB(rand() % 256, rand() % 256, rand() % 256), RGB(rand() % 256, rand() % 256, rand() % 256),
RGB(rand() % 256, rand() % 256, rand() % 256), RGB(rand() % 256, rand() % 256, rand() % 256), RGB(rand() % 256, rand() % 256, rand() % 256) };
int apt = { HS_HORIZONTAL, HS_BDIAGONAL, HS_VERTICAL, HS_CROSS, HS_FDIAGONAL, HS_DIAGCROSS };
switch (message)
{
case WM_CREATE:
cxclient = LOWORD(lParam);
cyclient = HIWORD(lParam);

return 0;

case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
for (i = 0; i < 6; i++)
{
SelectObject(hdc, CreateHatchBrush(apt, color));
Rectangle(hdc, cxclient*i / 6, 0, cxclient * (i + 1) / 6, cyclient);
}
EndPaint(hwnd, &ps);
return 0;

case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}

我是一只小菜鸟 发表于 2015-6-1 19:19:58

{:9_233:}

abc75727 发表于 2015-6-1 21:49:16

我是一只小菜鸟发表于 2015-6-1 19:19

:cry

南郊居士 发表于 2015-6-9 18:07:09

楼主的消息处理错了，在WM_CREATE消息里是不能这样获取窗口大小的，应该处理WM_SIZE消息，也就是：
case WM_SIZE:
            cxclient = LOWORD(lParam);
            cyclient = HIWORD(lParam);

            return 0;
详情参考MSDN

顺便说一句，楼主在处理SelectObject的时候应该处理得更细致一点，比如保存旧画刷与销毁新画刷，这都是MSDN要求进行的动作

abc75727 发表于 2015-6-12 12:38:57

南郊居士发表于 2015-6-9 18:07
楼主的消息处理错了，在WM_CREATE消息里是不能这样获取窗口大小的，应该处理WM_SIZE消息，也就是：
case W ...

嗯，谢谢了啊，问题解决咯

智商是硬伤 发表于 2015-8-15 08:34:42

咱们码农有力量，嘿{:7_146:}

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本意用for循环显示6个阴影线画刷，颜色随机，但是显示错误