wince6.0操作系统下
请问 下面这段代码为何不能从电脑路径下 D:/Lena.bmp，加载一幅位图呢？？？？？
其实代码没有问题，重点是这个函数的问题，麻烦大家看一看。LRESULT DoPaintMain (HWND hWnd, UINT wMsg, WPARAM wParam, LPARAM lParam)
//======================================================================
// Header file
//
// Written for the book Programming Windows CE
// Copyright (C) 2007 Douglas Boling
//================================================================
// Returns number of elements
#define dim(x) (sizeof(x) / sizeof(x[0])) //----------------------------------------------------------------------
// Generic defines and data types
//
struct decodeUINT { // Structure associates
UINT Code; // messages
// with a function.
LRESULT (*Fxn)(HWND, UINT, WPARAM, LPARAM);
};
struct decodeCMD { // Structure associates
UINT Code; // menu IDs with a
LRESULT (*Fxn)(HWND, WORD, HWND, WORD); // function
};//----------------------------------------------------------------------
// Function prototypes
//
HWND InitInstance (HINSTANCE, LPWSTR, int);
int TermInstance (HINSTANCE, int);// Window procedures
LRESULT CALLBACK MainWndProc (HWND, UINT, WPARAM, LPARAM);// Message handlers
LRESULT DoPaintMain (HWND, UINT, WPARAM, LPARAM);
LRESULT DoDestroyMain (HWND, UINT, WPARAM, LPARAM);//======================================================================
// HelloCE - A simple application for Windows CE
//
// Written for the book Programming Windows CE
// Copyright (C) 2007 Douglas Boling
//======================================================================
#include <windows.h> // For all that Windows stuff
#include "helloce.h" // Program-specific stuff//----------------------------------------------------------------------
// Global data
//
const TCHAR szAppName[] = TEXT("HelloCE");
HINSTANCE hInst; // Program instance handle// Message dispatch table for MainWindowProc
const struct decodeUINT MainMessages[] = {
WM_PAINT, DoPaintMain,
WM_DESTROY, DoDestroyMain,
};//======================================================================
// Program entry point
//
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPWSTR lpCmdLine, int nCmdShow) {
MSG msg;
int rc = 0;
HWND hwndMain; // Initialize this instance.
hwndMain = InitInstance (hInstance, lpCmdLine, nCmdShow);
if (hwndMain == 0) return 0x10; // Application message loop
while (GetMessage (&msg, NULL, 0, 0)) {
TranslateMessage (&msg);
DispatchMessage (&msg);
}
// Instance cleanup
return TermInstance (hInstance, msg.wParam);
}
//----------------------------------------------------------------------
// InitInstance - Instance initialization
//
HWND InitInstance (HINSTANCE hInstance, LPWSTR lpCmdLine, int nCmdShow) {
WNDCLASS wc;
HWND hWnd; // Save program instance handle in global variable.
hInst = hInstance;#if defined(WIN32_PLATFORM_PSPC) || defined(WIN32_PLATFORM_WFSP)
// If Windows Mobile, only allow one instance of the application
hWnd = FindWindow (szAppName, NULL);
if (hWnd) {
SetForegroundWindow ((HWND)(((DWORD)hWnd) | 0x01));
return 0;
}
#endif // Register application main window class.
wc.style = 0; // Window style
wc.lpfnWndProc = MainWndProc; // Callback function
wc.cbClsExtra = 0; // Extra class data
wc.cbWndExtra = 0; // Extra window data
wc.hInstance = hInstance; // Owner handle
wc.hIcon = NULL, // Application icon
wc.hCursor = LoadCursor (NULL, IDC_ARROW);// Default cursor
wc.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);
wc.lpszMenuName = NULL; // Menu name
wc.lpszClassName = szAppName; // Window class name if (RegisterClass (&wc) == 0) return 0; // Create main window.
hWnd = CreateWindow (szAppName, // Window class
TEXT("HelloCE"), // Window title
// Style flags
WS_VISIBLE | WS_CAPTION | WS_SYSMENU,
CW_USEDEFAULT, // x position
CW_USEDEFAULT, // y position
CW_USEDEFAULT, // Initial width
CW_USEDEFAULT, // Initial height
NULL, // Parent
NULL, // Menu, must be null
hInstance, // Application instance
NULL); // Pointer to create
// parameters
if (!IsWindow (hWnd)) return 0; // Fail code if not created. // Standard show and update calls
ShowWindow (hWnd, nCmdShow);
UpdateWindow (hWnd);
return hWnd;
}
//----------------------------------------------------------------------
// TermInstance - Program cleanup
//
int TermInstance (HINSTANCE hInstance, int nDefRC) {
return nDefRC;
}
//======================================================================
// Message handling procedures for main window
//
//----------------------------------------------------------------------
// MainWndProc - Callback function for application window
//
LRESULT CALLBACK MainWndProc (HWND hWnd, UINT wMsg, WPARAM wParam,
LPARAM lParam) {
INT i;
//
// Search message list to see if we need to handle this
// message. If in list, call procedure.
//
for (i = 0; i < dim(MainMessages); i++) {
if (wMsg == MainMessages[i].Code)
return (*MainMessages[i].Fxn)(hWnd, wMsg, wParam, lParam);
}
return DefWindowProc (hWnd, wMsg, wParam, lParam);
}
//----------------------------------------------------------------------
// DoPaintMain - Process WM_PAINT message for window.
//
LRESULT DoPaintMain (HWND hWnd, UINT wMsg, WPARAM wParam,
LPARAM lParam) {
PAINTSTRUCT ps;
RECT rect;
HDC hdc;
HDC hdcMem;
HBITMAP hBitmap;
HBITMAP hOldSel;
BITMAP bmp; hdc = GetDC( hWnd ); hdcMem = CreateCompatibleDC( hdc);
hBitmap = SHLoadDIBitmap( L" D:/Lena.bmp"); hOldSel = (HBITMAP)SelectObject ( hdcMem, hBitmap ); GetObject ( hBitmap, sizeof( BITMAP), &bmp); BitBlt( hdc, 0,0, bmp.bmWidth, bmp.bmHeight, hdcMem,0,0,SRCCOPY) ; SelectObject( hdcMem, hOldSel);
DeleteDC( hdcMem );
//// Get the size of the client rectangle
//GetClientRect (hWnd, &rect); //hdc = BeginPaint (hWnd, &ps);
//DrawText (hdc, TEXT ("Hello Windows CE!"), -1, &rect,
// DT_CENTER | DT_VCENTER | DT_SINGLELINE); //EndPaint (hWnd, &ps);
return 0;
}
//----------------------------------------------------------------------
// DoDestroyMain - Process WM_DESTROY message for window.
//
LRESULT DoDestroyMain (HWND hWnd, UINT wMsg, WPARAM wParam,
LPARAM lParam) {
PostQuitMessage (0);
return 0;
}
解决方案 »
免费领取超大流量手机卡，每月29元包185G流量+100分钟通话, 中国电信官方发货