LRESULT CALLBACK WinProc(HWND hwnd,
UINT message,
WPARAM wparam,
additional message information,
LPARAM lparam)
{
………………
MessageBox(hwnd, lpctstr, _T("WinMain"), MB_OKCANCEL);
}在MessageBox中的第二参数是LPCTSTR类型,而回调函数WinProc的第三个参数是WPARAM类型,他们之间怎么转换啊?
看了许多帖子,也尝试了,但是还是不管用额。
如果传进来就是CString *
那么CString res = *(CString *)wparam;根据你传进来的类型来转换
LPCTSTR 也是一个32位的整数你是不是想自定义消息啊?
然后把WPARAM 传进来一个LPCTSTR指向的字符串那样你在MessageBox的第二个参数直接强制转换一下就行了
(LPCTSTR)wparam
不知道你要的是否是这种效果
#include <windows.h>#define WM_USERDEF WM_USER+100 // 在此定义消息LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;// LPCTSTR lpStr = TEXT("this is a LPCTSTR string"); // 这里有个字符串
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 ;
PAINTSTRUCT ps ;
RECT rect ;
LPCTSTR lpStr = TEXT("this is a LPCTSTR string"); // 这里有个字符串
switch (message)
{
case WM_CREATE:
// PlaySound (TEXT ("hellowin.wav"), NULL, SND_FILENAME | SND_ASYNC) ;
return 0 ;
case WM_LBUTTONDOWN: PostMessage(hwnd,WM_USERDEF,(WPARAM)lpStr,NULL); // 在此发送消息
return 0; case WM_USERDEF: MessageBox(hwnd,lpStr,TEXT("Info"),MB_OK); // 在此响应消息 return 0; case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;
GetClientRect (hwnd, &rect) ;
DrawText (hdc, TEXT ("Hello, Windows 98!"), -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) ;
}
MessageBox(hwnd,(LPTSTR)wParam,TEXT("Info"),MB_OK);
您好,
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