【发布时间】:2014-01-01 19:39:02
【问题描述】:
好吧,我已经尝试学习 c 一段时间了,我刚拿到一本书(Charles Petzold 的《Programming Windows》),我刚刚使用 code:blocks 编写了我的第一个程序。一切正常,但由于某种原因,它会打开 cmd 窗口,如果它关闭程序。这是代码
#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 ("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 computer is stupid so im not gona work!"), szAppName, MB_ICONERROR);
return 0;
}
hwnd = CreateWindow (szAppName, TEXT ("The program"), 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))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam ;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )
{
HDC hdc;
PAINTSTRUCT ps;
RECT rect;
switch (message)
{
case WM_CREATE:
MessageBox(NULL, TEXT("a sound would play but i dont have the cd"),
TEXT("sound"), 0);
return 0;
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps);
GetClientRect(hwnd, &rect);
DrawText (hdc, TEXT("sup, bra."), -1, &rect, DT_SINGLELINE | DT_CENTER
| DT_VCENTER);
EndPaint (hwnd, &ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
【问题讨论】:
-
DefWindowProc 语句放错了位置。它应该移到 switch 语句块中,而不是作为 WinMain 的 return 语句。 WinMain 应该简单地将
return 0语句作为最后一行。