图像无法加载

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问题描述

我正在尝试使用它作为资源加载.bmp图像。但它没有正确加载。放心bmp图像，它们位于正确的位置。现在，当我调试程序时，MessageBox（"图像未正确加载"）不会出现
但是弹出MessageBox（"SelectObject（）失败"）。使用它作为资源的图像加载有什么问题。使用fuLoad作为LR_LOADFROMFILE的bitmap1正确加载并显示图像。但是我认为IDB_BITMAP1正在构成装载问题
。

I am trying to load a .bmp image using it as a resource. But it is not loading properly. Rest assured about the bmp images, they are at the correct location. Now when I debug the program the MessageBox("Image not loaded properly") does not come but the MessageBox("SelectObject() failed") pops up. What's the problem with the image loading using it as a resource. The bitmap1 using fuLoad as LR_LOADFROMFILE is loading properly and displays the image. But the IDB_BITMAP1 is posing loading problems I suppose.

#ifndef UNICODE
#define UNICODE
#endif

#include <windows.h>
#include "resource.h"

LRESULT CALLBACK WindowProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
HBITMAP bitmap,bitmap1;
HINSTANCE hInst;
HWND hwnd;
HDC hdc;

int WINAPI wWinMain (HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow)
{
	// Register the window class.
	const wchar_t CLASS_NAME[] = L"Sample Window Class";

	WNDCLASS wc = {};

	wc.lpfnWndProc = WindowProc;
	hInst=wc.hInstance = hInstance;
	wc.lpszClassName = CLASS_NAME;
	wc.hCursor = LoadCursor (NULL, IDC_ARROW);

	RegisterClass (&wc);

	// Create the window.

	hwnd = CreateWindowEx (
		0,                              // Optional window styles.
		CLASS_NAME,                     // Window class
		L"Learn to Program Windows",    // Window text
		WS_OVERLAPPEDWINDOW,            // Window style

										// Size and position
		CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,

		NULL,       // Parent window
		NULL,       // Menu
		hInstance,  // Instance handle
		NULL        // Additional application data
	);

	if ( hwnd == NULL )
	{
		return 0;
	}

	ShowWindow (hwnd, nCmdShow);

	// Run the message loop.

	MSG msg = {};
	while ( GetMessage (&msg, NULL, 0, 0) )
	{
		TranslateMessage (&msg);
		DispatchMessage (&msg);
	}

	return 0;
}
HDC image;

/*
void OpenImage ()
{
	int x, y, xs, ys;

	h = (HBITMAP)LoadImage (NULL, pszFilePath, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);

	BITMAP q;
	GetObject (reinterpret_cast<HGDIOBJ>(h), sizeof (BITMAP),
		reinterpret_cast<LPVOID>(&q));
	if ( gx > q.bmWidth ) { x = q.bmWidth; xs = (gx - x) / 2; }
	else { x = 0.95*gx; xs = (gx - x) / 2; }
	if ( gy > q.bmHeight ) { y = q.bmHeight; ys = (gy - y) / 2; }
	else { y = 0.95*gy; ys = (gy - y) / 2; }
	h = (HBITMAP)LoadImage (NULL, pszFilePath, IMAGE_BITMAP, x, y, LR_LOADFROMFILE);
	if ( h == NULL )
	{
		MessageBox (hwnd, L"File not loaded properly", L"Error", MB_OK); DeleteObject (h); value = FALSE;
		return;
	}
	hdcMem = CreateCompatibleDC (hdc);
	if ( hdcMem == NULL )
	{
		MessageBox (hwnd, L"CreateCompatibleDC failed", L"Error", MB_OK); DeleteObject (hdcMem); value = FALSE;
		return;
	}
	HBITMAP old = (HBITMAP)SelectObject (hdcMem, h);
	if ( old == NULL )
	{
		MessageBox (hwnd, L"SelectObject failed", L"Error", MB_OK); DeleteObject (old); value = FALSE;
		return;
	}

	BOOL j = BitBlt (hdc, xs, ys, x, y, hdcMem, 0, 0, SRCCOPY);
	if ( !j )
	{
		MessageBox (hwnd, L"BitBlt failed", L"Error", MB_OK); value = FALSE;
		return;
	}
	SelectObject (hdcMem, old);
	DeleteObject (h);
	DeleteObject (hdcMem);
	value = FALSE;

}
*/
void draw ()
{
	bitmap1 = (HBITMAP)LoadImage (NULL, L"Alok.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
	if ( bitmap1 == NULL )
	{
		MessageBox (hwnd, L"bitmap1 dosen't load properly", L"Faliure", MB_OK);
	}
	//bitmap = bitmap1;
	BITMAP q;
	GetObject (reinterpret_cast<HGDIOBJ>(bitmap), sizeof (BITMAP),
		reinterpret_cast<LPVOID>(&q));
	HDC hdcMem = CreateCompatibleDC (hdc);
	if ( hdcMem == NULL )
	{
		MessageBox (hwnd, L"CreateCompatibleDC() failed", L"Faliure", MB_OK);
	}
	HBITMAP bold = (HBITMAP)SelectObject (hdcMem, bitmap);
	if ( bold == NULL )
	{
		MessageBox (hwnd, L"SelectObject() failed", L"Faliure", MB_OK);
	}
	BOOL g = BitBlt (hdc, 0, 0, q.bmWidth,q.bmHeight, hdcMem, 0, 0, SRCCOPY);
	if ( !g )
	{
		MessageBox (hwnd, L"BitBlt() failed", L"Faliure", MB_OK);
	}
}
LRESULT CALLBACK WindowProc (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	switch ( uMsg )
	{
		case WM_DESTROY:
			PostQuitMessage (0);
			return 0;

		case WM_CREATE:
		{
			bitmap = (HBITMAP)LoadImage (hInst, MAKEINTRESOURCE (IDB_BITMAP1), IMAGE_BITMAP, 400, 400, LR_DEFAULTCOLOR);

			//bitmap = (HBITMAP)LoadImage (hInstance, MAKEINTRESOURCE (IDB_BITMAP1), IMAGE_BITMAP, 0, 0, LR_DEFAULTCOLOR);
			if ( bitmap == NULL )
			{
				MessageBox (hwnd, L"Failed to load image", L"Error", MB_OK);
			}

			wchar_t ch[10];
			BITMAP q;
			GetObject (reinterpret_cast<HGDIOBJ>(bitmap), sizeof (BITMAP),
				reinterpret_cast<LPVOID>(&q));
			_itow (q.bmHeight, ch, 10);
			MessageBox (hwnd, ch, L"Height", MB_OK);
			_itow (q.bmWidth, ch, 10);
			MessageBox (hwnd, ch, L"Width", MB_OK);
		}

		case WM_PAINT:
		{
			PAINTSTRUCT ps;
			hdc = BeginPaint (hwnd, &ps);
			FillRect (hdc, &ps.rcPaint, (HBRUSH)(COLOR_WINDOW + 1));

			draw ();

			EndPaint (hwnd, &ps);
		}
		return 0;

	}
	return DefWindowProc (hwnd, uMsg, wParam, lParam);
}

请告诉我如何使用gdi加载.jpg图像。我在网上搜索都是徒劳的，但却找不到解决办法。如果你知道的话请提示。

Please also tell me how to load a .jpg image using gdi. I had searched all over the web in vain but come up with no solution. Please drop a hint if you know.

Saurav yadav

properly

图像无法加载

问题描述

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