Win32 API - Захват изображения рабочего стола

[Shenochek]

Уважаемые знатоки ресурса, прошу помочь доделать программу.

Исходный код прилагаю.

При компиляции приложения возникают 3 ошибки:

- error C4700: uninitialized local variable 'hdcCompatible' used

- error C4700: uninitialized local variable 'hdcScreen' used

- error C4700: uninitialized local variable 'hOldBitmap' used

Прошу ткнуть носом, или помочь довести код до рабочего состояния. Буду благодарен за любую помощь.


Цитата:



#include "stdafx.h"

#include "resource.h"

#define MAX_LOADSTRING 100



// Global Variables:

HINSTANCE hInst;

TCHAR szTitle[MAX_LOADSTRING];

TCHAR szWindowClass[MAX_LOADSTRING];



ATOM MyRegisterClass(HINSTANCE hInstance);

BOOL InitInstance(HINSTANCE, int);

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

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



int APIENTRY WinMain(HINSTANCE hInstance,

HINSTANCE hPrevInstance,

LPSTR lpCmdLine,

int nCmdShow)

{

// TODO: Place code here.

MSG msg;

HACCEL hAccelTable;



// Initialize global strings

LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);

//LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);

LoadString(hInstance, IDC_WIN32PROJECT1, szWindowClass, MAX_LOADSTRING);

//LoadString(hInstance, IDC_PRINTSCREEN, szWindowClass, MAX_LOADSTRING);

MyRegisterClass(hInstance);



// Perform application initialization:

if (!InitInstance (hInstance, nCmdShow))

{

return FALSE;

}



hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_WIN32PROJECT1));

//hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_PRINTSCREEN);



// Main message loop:

while (GetMessage(&msg, NULL, 0, 0))

{

if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))

{

TranslateMessage(&msg);

DispatchMessage(&msg);

}

}



return msg.wParam;

}



ATOM MyRegisterClass(HINSTANCE hInstance)

{

WNDCLASSEX wcex;



wcex.cbSize = sizeof(WNDCLASSEX);

wcex.style = CS_HREDRAW | CS_VREDRAW;

wcex.lpfnWndProc = (WNDPROC)WndProc;

wcex.cbClsExtra = 0;

wcex.cbWndExtra = 0;

wcex.hInstance = hInstance;

//wcex.hIcon = LoadIcon(hInstance, (LPCTSTR)IDI_PRINTSCREEN);

wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_WIN32PROJECT1));

wcex.hCursor = LoadCursor(NULL, IDC_ARROW);

wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);

//wcex.lpszMenuName = (LPCSTR)IDC_PRINTSCREEN;

wcex.lpszMenuName = MAKEINTRESOURCE(IDC_WIN32PROJECT1);

wcex.lpszClassName = szWindowClass;

wcex.hIconSm = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);



return RegisterClassEx(&wcex);

}

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)

{

HWND hWnd;

hInst = hInstance; // Store instance handle in our global variable



hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);



if (!hWnd)

{

return FALSE;

}



ShowWindow(hWnd, nCmdShow);

UpdateWindow(hWnd);



return TRUE;

}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

{

int wmId, wmEvent;

TCHAR szHello[MAX_LOADSTRING];

HDC hDC,hCompatibleDC,hDC1,hdcScreen,hdcCompatible;

PAINTSTRUCT PaintStruct;

HANDLE hBitmap,hOldBitmap,hbmScreen,hwnd;

RECT Rect;

BITMAP Bitmap;



LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);

switch (message)

{

case WM_COMMAND:

wmId = LOWORD(wParam);

wmEvent = HIWORD(wParam);

// Parse the menu selections:

switch (wmId)

{

case IDM_EXIT:

DestroyWindow(hWnd);

break;

default:

return DefWindowProc(hWnd, message, wParam, lParam);

}

break;



case WM_CREATE:

/////////////////////////////////////////////////////////////////////

hdcScreen = GetDC(NULL);

hdcCompatible = CreateCompatibleDC(hdcScreen);

hbmScreen = CreateCompatibleBitmap(hdcScreen,GetDeviceCaps(hdcScreen, HORZRES),GetDeviceCaps(hdcScreen, VERTRES));

// Выбираем совместимый точеный рисунок в DC.

hOldBitmap=SelectObject(hdcCompatible,hbmScreen);

// копируем цветовые данные для всего дисплея в точечный рисунок,

// который выбирается в совместимый DC.

BitBlt(hdcCompatible,0,0,GetDeviceCaps(hdcScreen,HORZRES),GetDeviceCaps(hdcScreen,VERTRES),hdcScreen ,0,0,SRCCOPY);

//

break;



case WM_PAINT:

/////////////////////////////////////////////////////////////////////

hDC1=BeginPaint(hWnd,&PaintStruct);

BitBlt(hDC1,0,0,GetDeviceCaps(hdcScreen, HORZRES),GetDeviceCaps(hdcScreen, VERTRES),hdcCompatible,0,0,SRCCOPY);

EndPaint(hWnd,&PaintStruct);

//

return 0;



case WM_DESTROY:

///////////////////////////////////////////////////////////////////////

SelectObject(hdcCompatible,hOldBitmap);

DeleteDC(hdcCompatible);

DeleteObject(hOldBitmap);

ReleaseDC(NULL, hdcScreen);

//

PostQuitMessage(0);

break;

default:

return DefWindowProc(hWnd, message, wParam, lParam);

}

return 0;

}