在重新评估从 mfc 指出的可嵌入资源加载动画光标后，我找到了一个解决方案，允许我从任意内存地址加载光标。
来自可嵌入资源的数据和从文件读入内存的数据完全相同。因此，它建议 CreateIconFromResource也应该在正常的常规内存上工作。但是，有一个根本区别。可嵌入资源的内存驻留在可执行文件的特殊部分中，这些部分通常填充到最近的 4096 字节边界。在运行时分配的内存包含垃圾值。
现在，我发现可行的解决方案通过简单地分配零填充字节的保护带来利用这一点。在我自己的测试用例中，我发现 8 是最小值，它也恰好是 riff 容器中块的大小。巧合？我怀疑这是一个错误，由于它在 dll/可执行文件中的对齐限制，该算法恰好适用于可嵌入资源。
const int guardbandSize = 8;
FILE* fs = fopen("action.ani", "rb");
fseek(fs, 0,SEEK_END); int dwSize = ftell(fs); fseek(fs, 0,SEEK_SET);
char* memory = new char[dwSize + guardbandSize];
fread(memory, 1, dwSize, fs); memset(memory + dwSize, 0, guardbandSize);
fclose(fs);
cursor = (HCURSOR)CreateIconFromResource((PBYTE)memory,dwSize,FALSE,0x00030000);
delete memory;
以下是加载动画光标的各种方法的概述。
#include <Windows.h>
#include <stdio.h>
#include "resource2.h"
void* hWnd;
bool visible = true;
bool running = true;
LRESULT CALLBACK WndProcInternal( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) ;
HCURSOR cursor = 0;
void main()
{
//Setup configuration
const int Width = 640, Height = 480;
const int Method = 4;
//Setup window class
WNDCLASS wcd;
wcd.style = CS_PARENTDC | CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
wcd.lpfnWndProc = (WNDPROC)WndProcInternal;
wcd.cbClsExtra = 0;
wcd.cbWndExtra = 0;
wcd.hInstance = GetModuleHandle(NULL);
wcd.hIcon = LoadIcon(NULL, IDI_WINLOGO);
wcd.hCursor = LoadCursor(NULL, IDC_ARROW);
wcd.hbrBackground = (HBRUSH)COLOR_BACKGROUND;
wcd.lpszMenuName = NULL;
wcd.lpszClassName = TEXT("AnimatedIcon");
//Register the window class
if(!RegisterClass(&wcd))
{
MessageBox(NULL, TEXT("Window Registration Failed!"), TEXT("Error!"),MB_ICONEXCLAMATION | MB_OK);
FatalExit(-1);
}
//Create a window
if (!(hWnd=CreateWindowEx(WS_EX_CLIENTEDGE, TEXT("AnimatedIcon"), TEXT("AnimatedIcon"),
WS_VISIBLE | WS_CAPTION | WS_MINIMIZEBOX | WS_THICKFRAME | WS_MAXIMIZEBOX | WS_SYSMENU,
0, 0, Width, Height, NULL, NULL, NULL, NULL)))
{
MessageBoxA(NULL,"Window Creation Error.","ERROR",MB_OK|MB_ICONEXCLAMATION);
FatalExit(-1);
}
if( Method == 1 )
{
//Method 1: Load cursor directly from a file
cursor = LoadCursorFromFileA("action.ani");
}
if( Method == 2 )
{
//Method 2: Load cursor from an resource section in the executable.
cursor = LoadCursor(0, MAKEINTRESOURCE(IDR_ANICURSORS1));
}
if( Method == 3 )
{
//Method 3: Manually locate the resource section in the executable & create the cursor from the memory.
HINSTANCE hInst=GetModuleHandle(0);
HRSRC hRes=FindResourceA(hInst,MAKEINTRESOURCEA(IDR_ANICURSORS1),"ANICURSORS");
DWORD dwSize=SizeofResource(hInst,hRes);
HGLOBAL hGlob=LoadResource(hInst,hRes);
LPBYTE pBytes=(LPBYTE)LockResource(hGlob);
cursor = (HCURSOR)CreateIconFromResource(pBytes,dwSize,FALSE,0x00030000);
}
if( Method == 4 )
{
//Method 4: Load the cursor from a file into memory & create the cursor from the memory.
const int guardbandSize = 8;
FILE* fs = fopen("action.ani", "rb");
fseek(fs, 0,SEEK_END); int dwSize = ftell(fs); fseek(fs, 0,SEEK_SET);
char* memory = new char[dwSize + guardbandSize];
fread(memory, 1, dwSize, fs); memset(memory + dwSize, 0, guardbandSize);
fclose(fs);
cursor = (HCURSOR)CreateIconFromResource((PBYTE)memory,dwSize,FALSE,0x00030000);
delete memory;
}
//Set the cursor for the window and display it.
SetClassLong((HWND)hWnd, GCL_HCURSOR, (LONG)cursor);
while (running)
{
MSG wmsg;
if (PeekMessage(&wmsg, (HWND)hWnd, 0, 0, PM_REMOVE))
{
TranslateMessage(&wmsg);
DispatchMessage(&wmsg);
}
}
}
LRESULT CALLBACK WndProcInternal( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
if( uMsg == WM_DESTROY )
{
PostQuitMessage(1);
running = false;
}
return (long)DefWindowProc((HWND)hWnd,uMsg,(WPARAM)wParam,(LPARAM)lParam);
}