在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
{8>_,z^P)
iC5JU&l 一、实现方法
9^C!,A{u4 ^c[CyZ:a 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
=w;xaxjL Rm[rQ}: #pragma data_seg("shareddata")
i+T0}M< HHOOK hHook =NULL; //钩子句柄
)n3biQL_ UINT nHookCount =0; //挂接的程序数目
4%c7#AX[T static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
B9;,A;E}; static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
9cw4tqTm static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
?SsRN jeL static int KeyCount =0;
S*DBY~pZy static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
[<3Q$*Ew #pragma data_seg()
EiIFVP [&]YVn>kj 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
{*5;:QnT 7:R{~|R DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
/="D]K)%b8 ^JF_;~C BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
fi-&[llg cKey,UCHAR cMask)
6&xW9' 6b: {
XM5;AcD BOOL bAdded=FALSE;
pFv[z':&Q for(int index=0;index<MAX_KEY;index++){
>/OXC+=^4 if(hCallWnd[index]==0){
_
/28Cw hCallWnd[index]=hWnd;
K&"Pm9
HotKey[index]=cKey;
);/5#b@<Y HotKeyMask[index]=cMask;
RGPU~L bAdded=TRUE;
e&a[k KeyCount++;
>a anLLO break;
Spr:K, }
exrt|A]_[ }
)1tnZ=& return bAdded;
3K'o&>}L }
me}Gb a //删除热键
dO4U9{+ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
c_8 mQ {
;HLMU36q BOOL bRemoved=FALSE;
<J_,9&\J for(int index=0;index<MAX_KEY;index++){
77=y!SDP if(hCallWnd[index]==hWnd){
C6=;(=?C if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
'm p{O hCallWnd[index]=NULL;
.5Z@5g` HotKey[index]=0;
3vGaT4TDx HotKeyMask[index]=0;
U*+!w@
. bRemoved=TRUE;
|@bNd7=2d KeyCount--;
,aj+mlZd2 break;
%>z8:oJ }
mLxwJ }
r@@eC[' }
%[bO\, return bRemoved;
%RD7=Z-z }
BQfAen] J/&*OC pfn#~gC_= DLL中的钩子函数如下:
=x.v*W]F` ([XyW{=h! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
"62Ysapq+ {
Go+,jT- BOOL bProcessed=FALSE;
!&:W1Jkp( if(HC_ACTION==nCode)
OXCml(>{ {
^[?+=1
k if((lParam&0xc0000000)==0xc0000000){// 有键松开
D(ntVR switch(wParam)
Bw/H'Y {
/dvnQW4}8 case VK_MENU:
&+r
;> MaskBits&=~ALTBIT;
6_}){ZR break;
:>-sITeY case VK_CONTROL:
!m O] zn MaskBits&=~CTRLBIT;
[F-u'h< *l break;
>p#d;wK4_ case VK_SHIFT:
U@t?jTMBkO MaskBits&=~SHIFTBIT;
VEYKrZA break;
uB&I56 default: //judge the key and send message
cS ;=_%~ break;
&/#Tk>: }
i^V4N4ux] for(int index=0;index<MAX_KEY;index++){
@f01xh=8 if(hCallWnd[index]==NULL)
u9~V2>r\ continue;
s1b\I6&:J if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-N!soJ< {
`&Of82*w SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
aKU8"
5 bProcessed=TRUE;
cM'[;u }
}PD(kk6fX }
w0%ex#lkm }
J<:D~@qq else if((lParam&0xc000ffff)==1){ //有键按下
hE`%1j2( switch(wParam)
%|6Q7'@p {
7z0uj case VK_MENU:
~Wd8>a{w MaskBits|=ALTBIT;
nsw8[pk break;
i2R]lE8 case VK_CONTROL:
UU~;B MaskBits|=CTRLBIT;
K~~*M?.Z break;
cw-JGqLx case VK_SHIFT:
`0vy+T5 MaskBits|=SHIFTBIT;
KdQ|$t break;
;%.k}R%O@ default: //judge the key and send message
6!PX!
UkF break;
bIl0rx[` }
]]QCJf@p for(int index=0;index<MAX_KEY;index++){
{_N(S]Z if(hCallWnd[index]==NULL)
4)Wzj4qW continue;
0+`*8G) if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
!F s)"? {
91Sb=9 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
<u%e* bProcessed=TRUE;
[B;Ek\ 5W }
M#<fh:> }
ZaV66Y> }
!_z>w6uR
if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
FJH8O7 for(int index=0;index<MAX_KEY;index++){
c] 9CN if(hCallWnd[index]==NULL)
k yA(m;r continue;
>-WOw if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ED_5V@ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
T7nX8{l[RG //lParam的意义可看MSDN中WM_KEYDOWN部分
u\Q**m2XP }
PsT v\! }
bH]!~[ }
C^v- &*v return CallNextHookEx( hHook, nCode, wParam, lParam );
_;RD-kv }
N28?JQha D_kzR 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
XQ y|t"Vq> *G"#.YvE BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Y-k~ 7{7 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
MM$"6Jor
:@'0)7 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
qCT\rZU _( /lBf{| LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
gxtbu$ {
tdK^X1 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
AsF`A"Cdw< {
2G>
]W?> //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
xJ5!`#= SaveBmp();
k(Xv&Zn return FALSE;
4^9_E&Fa }
yp'>+cLa …… //其它处理及默认处理
A>@epCD }
"lb!m9F{ P&,cCR> V!tBipX% 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
zgTi Az qnV9TeU) 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
>5W"a?( L 'Rapu 二、编程步骤
1caod0gor [m&ZAq 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
q9]L!V9Rv 7u0R=q 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
5!p'n#_ _
9]3S>Rn 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
I"?&X4%e >&z+ih 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
,1+_k ="Z 6;V1PK>9 5、 添加代码,编译运行程序。
&h[}5 p[:%Ck"$7 三、程序代码
ZJM^P'r.1c Bq`kVfx ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
<cjTn:w #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
aBLb i #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
L#bQ`t #if _MSC_VER > 1000
ay[*b_f #pragma once
M&-/&>n! #endif // _MSC_VER > 1000
"A3xX&9-q #ifndef __AFXWIN_H__
l_EI7mJ #error include 'stdafx.h' before including this file for PCH
A2S9h,t #endif
S*:w\nXP~ #include "resource.h" // main symbols
>ON.ftZi class CHookApp : public CWinApp
&$im^0`r_ {
Rj=Om public:
DlO;EH CHookApp();
(LPD // Overrides
S`.-D+.68 // ClassWizard generated virtual function overrides
F\72^,0 //{{AFX_VIRTUAL(CHookApp)
I ^92b public:
IbwRb virtual BOOL InitInstance();
ZK*aVYnu virtual int ExitInstance();
l]&)an //}}AFX_VIRTUAL
;wB3H //{{AFX_MSG(CHookApp)
T0jJp7O // NOTE - the ClassWizard will add and remove member functions here.
! .}{
f;Ls // DO NOT EDIT what you see in these blocks of generated code !
G"wQ(6J@ //}}AFX_MSG
mr.DP~O:9p DECLARE_MESSAGE_MAP()
4/_|Qy };
$Bb/GXn{\ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
(DAJ(r~ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
5)6%D BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
+06j+I BOOL InitHotkey();
lNAHn<ht BOOL UnInit();
WQ`T'k#ESW #endif
i(rY'o2 BN net9KX4\ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
px@\b]/ #include "stdafx.h"
H:6$)# #include "hook.h"
0k [6 #include <windowsx.h>
nsk
6a #ifdef _DEBUG
R0'EoX #define new DEBUG_NEW
?>&Zm$5V #undef THIS_FILE
s6uAF(4, static char THIS_FILE[] = __FILE__;
Cn '=_1p #endif
U 7?ez #define MAX_KEY 100
pXa? Q@6 #define CTRLBIT 0x04
N3) v,S- #define ALTBIT 0x02
~G:7*:[b #define SHIFTBIT 0x01
#w6CL #pragma data_seg("shareddata")
"-%H</ HHOOK hHook =NULL;
v^'~-^s
UINT nHookCount =0;
iSHl_/I< static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
nrBitu, static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
<X*8Xzmv static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
37Y]sJrs$ static int KeyCount =0;
_#B/#^a static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
eH{ 9w8~ #pragma data_seg()
6Tnzg`0I HINSTANCE hins;
]9Hy
"#Fz void VerifyWindow();
Ea?.HRxl BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Ags`%( //{{AFX_MSG_MAP(CHookApp)
L4b4X // NOTE - the ClassWizard will add and remove mapping macros here.
g!ww;_ // DO NOT EDIT what you see in these blocks of generated code!
cK&oC$[r- //}}AFX_MSG_MAP
ibyA~YUN/ END_MESSAGE_MAP()
%\0 Y1!Hw KHtY
+93 CHookApp::CHookApp()
AAcbY; {
|#6Lcz7[ // TODO: add construction code here,
P_U-R%f // Place all significant initialization in InitInstance
oDa{HP\O]W }
$}fA;BP 2Fi*)\{ CHookApp theApp;
~l~g0J LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
): 6d_g{2 {
.>n|#XK BOOL bProcessed=FALSE;
bE~lc}% if(HC_ACTION==nCode)
k7*q.2 0 {
$'q(Z@ if((lParam&0xc0000000)==0xc0000000){// Key up
QL#y)G53Q switch(wParam)
cx}-tj"m- {
k9n93I|Cm case VK_MENU:
hLRQ) MaskBits&=~ALTBIT;
Z]<_a)> break;
<h({+N case VK_CONTROL:
L%FL{G
MaskBits&=~CTRLBIT;
#ZA
YP break;
30@ GFaab case VK_SHIFT:
^dqEOW MaskBits&=~SHIFTBIT;
yhaYlYv[_3 break;
e^ yB9b default: //judge the key and send message
/Ny&;Y break;
+Sfv.6~v }
e=2D^G#qE for(int index=0;index<MAX_KEY;index++){
F*f)Dv$p if(hCallWnd[index]==NULL)
]_s]Q_+E continue;
sXu]k#I^" if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
lS^0*(Y {
DZue.or SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
s><co] bProcessed=TRUE;
AM>:AtY }
JFZ p^{ }
P*>V6SK>b }
ioggD else if((lParam&0xc000ffff)==1){ //Key down
!_@%/I6 switch(wParam)
D_Y;N3E/rS {
FWg7e3 case VK_MENU:
9\F^\h{ MaskBits|=ALTBIT;
{\B!Rjt[T break;
(Gcl,IW case VK_CONTROL:
iwbjjQPr MaskBits|=CTRLBIT;
Zu,f&smb break;
VZ8L9h<{" case VK_SHIFT:
<CFur MaskBits|=SHIFTBIT;
qb Q> z+c break;
?D_zAh?pW default: //judge the key and send message
G;e}z&6<k break;
l_:%?4MA }
)7^jq| for(int index=0;index<MAX_KEY;index++)
&kG<LGXP# {
-Q;
w4@ if(hCallWnd[index]==NULL)
{-xnBx continue;
zF PSk] if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$IHa]9 { {
pfT7 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
(I$hw"%& bProcessed=TRUE;
AF@C9s }
_PIk,!< }
d1-QkW^0y }
b}fH$.V@ if(!bProcessed){
+"!IVHY for(int index=0;index<MAX_KEY;index++){
DsoF4&>g[B if(hCallWnd[index]==NULL)
<Wpz\U continue;
?V0IryF; if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Oe$C5KA>LW SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Nx99dr }
6
Qmtb2 }
gisZmu0 }
LE;c+(CAU return CallNextHookEx( hHook, nCode, wParam, lParam );
qVfOf\x.e }
*$QUE0 5J,vH[E BOOL InitHotkey()
\m<*3eS {
IY'S<)vOY if(hHook!=NULL){
rZLMYM nHookCount++;
+mJAIjH return TRUE;
>_@J&vC }
FW2} 9#R else
OHU(?TBo hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
>a<;)K^1 if(hHook!=NULL)
\?j(U8mB> nHookCount++;
*d=pK*g return (hHook!=NULL);
@c.pOX[]m, }
%lBFj/B BOOL UnInit()
}{$@|6)R {
HkrNt/] if(nHookCount>1){
N67m=wRx nHookCount--;
FX{Sb" return TRUE;
/O9z-!Jz }
aa|xZ BOOL unhooked = UnhookWindowsHookEx(hHook);
%EuSP0 if(unhooked==TRUE){
`!i>fo~ nHookCount=0;
<*L8kNykK hHook=NULL;
E:2Or~ }
NunT1ved return unhooked;
Af;$}P }
="V6z$N LVSJK.B BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
mz47lv1? {
HxjhP( BOOL bAdded=FALSE;
C`fQ` RL\ for(int index=0;index<MAX_KEY;index++){
`W5f'RU if(hCallWnd[index]==0){
=vR>KE hCallWnd[index]=hWnd;
kp[Jl0K5 HotKey[index]=cKey;
jN'zNOV~ HotKeyMask[index]=cMask;
~!I
\{( bAdded=TRUE;
Z',pQ{rD KeyCount++;
7>#74oy break;
d4lEd>Ni }
N)QW$iw9 }
@sP?@<C return bAdded;
r'&VH]m }
;e+ErN`a.~ 4XRVluD%W. BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
lyP<&<Y5 {
RJ`F2b sYN BOOL bRemoved=FALSE;
-0Ps.B for(int index=0;index<MAX_KEY;index++){
'2eggX% if(hCallWnd[index]==hWnd){
[l0>pHl@ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
OmsNo0OA hCallWnd[index]=NULL;
YtFtU;{ HotKey[index]=0;
%
_ N-:.S HotKeyMask[index]=0;
JMXCyDy; bRemoved=TRUE;
~x2azY2DP KeyCount--;
A," u~6Bn break;
b^0=X!bg }
q%nWBmPZ~y }
BRzrtK }
flRok?iF return bRemoved;
Gx!Y
4Q}- }
o<Q~pd#Ip, Wh,p$|vL void VerifyWindow()
`rvS(p[s {
Pwf":U) for(int i=0;i<MAX_KEY;i++){
"5=Gu1 if(hCallWnd
!=NULL){ @I9A"4Im
if(!IsWindow(hCallWnd)){ ->d3FR
hCallWnd=NULL; svN&~@l
HotKey=0; y6fYNB
HotKeyMask=0; @PutUYz
KeyCount--; fnB[b[
} :M3Fq@w=
} *&XOzaVU
} g/eE^o~;
} Hi#hf"V
R,8;GS42
BOOL CHookApp::InitInstance() +Y-Gp4"
{ r3'0{Nn+
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 8K'3iw>z
hins=AfxGetInstanceHandle(); G@s
rQum(
InitHotkey(); `#R[x7bA1
return CWinApp::InitInstance(); W2'u]1bs
} &=~Jw5WK
f-^JI*hj
int CHookApp::ExitInstance() _vm ~yKId
{ p[>!;qI
VerifyWindow(); }Ge$?ZFH
UnInit(); RGsgT ^
return CWinApp::ExitInstance(); EJrP{GH
} iU+O(vi
xQ%N%
`
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file =A{F&:+a]
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) )vn{?Ulj
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ;ry~x:7L7
#if _MSC_VER > 1000 Pd)mLs Jg
#pragma once 3VaL%+T$,
#endif // _MSC_VER > 1000 3%P<F>6
J
{{qu:(_g
class CCaptureDlg : public CDialog ~m3Q^ue
{ yhc}*BMZ
// Construction a[I
: ^S
public: mb,\ wZ
BOOL bTray; vhvFBx0
BOOL bRegistered; }Y:V&4DW
BOOL RegisterHotkey(); shKTj5s?
UCHAR cKey; \ ,D>zF
UCHAR cMask; E%LUJx}
void DeleteIcon(); .~u[rc|<
void AddIcon(); #Pt_<?JtV
UINT nCount; WUrE1%u
void SaveBmp(); t^
Ge "
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^,}1^?*
// Dialog Data LGB}:;$AL
//{{AFX_DATA(CCaptureDlg) wDR/Vr"f
enum { IDD = IDD_CAPTURE_DIALOG }; {.eo?dQ
CComboBox m_Key; m~04I~8vk
BOOL m_bControl; 2ci[L:U
BOOL m_bAlt; 2ca#@??R
BOOL m_bShift; ~[<C6{
CString m_Path; C cPOK2
CString m_Number; |P@N}P@
//}}AFX_DATA Hsn'"
// ClassWizard generated virtual function overrides L>L IN 1A
//{{AFX_VIRTUAL(CCaptureDlg) dIW@L
public: 9HB+4q[
virtual BOOL PreTranslateMessage(MSG* pMsg); #lR-?Uh
protected:
pu~b\&^G
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9TX2h0U?
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ClG\Kpirh
//}}AFX_VIRTUAL \HXq~Y
// Implementation C#-HWoSi
protected: p4V* %A&w
HICON m_hIcon; q
#mBNe62p
// Generated message map functions _K}q%In
//{{AFX_MSG(CCaptureDlg) 9U8x&Z]P
virtual BOOL OnInitDialog(); ?VlGTMaS+
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); BmKf%:l}
afx_msg void OnPaint(); "AU.Eh"-1
afx_msg HCURSOR OnQueryDragIcon(); /poGhB1k
virtual void OnCancel(); elAWQE us
afx_msg void OnAbout(); %N)B8A9kh
afx_msg void OnBrowse(); "4\k1H"_
afx_msg void OnChange(); 9}%$j
//}}AFX_MSG d(|q&b:
DECLARE_MESSAGE_MAP() ~Oa$rqu%m
}; GF6 o
#endif XwUa|"X6
Da615d
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file EjL]#,QR
#include "stdafx.h" C7ug\_,s
#include "Capture.h" 8T1zL.u>q
#include "CaptureDlg.h" )7 q"l3e"u
#include <windowsx.h> o2X95NiH
#pragma comment(lib,"hook.lib") ?TeozhUY
#ifdef _DEBUG T?Kh'
#define new DEBUG_NEW g3].STz6w
#undef THIS_FILE 9v_s_QkL2
static char THIS_FILE[] = __FILE__; <Xl#}6II
#endif K fD.J)
#define IDM_SHELL WM_USER+1 VxBBZsZO~
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); jB(+9?;1${
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); M#;
ks9
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; I<O$);DV'
class CAboutDlg : public CDialog N]w_9p~=1
{ O`c+y
public: RI@\cJ\}
CAboutDlg(); T/\RViG3
// Dialog Data y QClq{A
//{{AFX_DATA(CAboutDlg) x>}ml\R
enum { IDD = IDD_ABOUTBOX }; =nHKTB>
//}}AFX_DATA iP0m1
// ClassWizard generated virtual function overrides N2O *g`YC
//{{AFX_VIRTUAL(CAboutDlg) r5DRF4,7
protected: V_:`K$
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?D6uviQg
//}}AFX_VIRTUAL 6LBdTnzUd
// Implementation
jd](m:eG
protected: \= v.$u"c
//{{AFX_MSG(CAboutDlg) Hl,{4%]
//}}AFX_MSG >=[uLY[aK
DECLARE_MESSAGE_MAP() eJ99 W=
}; Up{[baWF
:D*U4<
/u
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) x=t(#R m
{ l)9IgJ|<b
//{{AFX_DATA_INIT(CAboutDlg) <%m YsaM
//}}AFX_DATA_INIT >E>yA d
} 1Z)Et,
G
IN|cv=
void CAboutDlg::DoDataExchange(CDataExchange* pDX) !l9{R8m>eJ
{ "E(i<
CDialog::DoDataExchange(pDX); 6;Z-Y>\c
//{{AFX_DATA_MAP(CAboutDlg) bZ\R0[0
//}}AFX_DATA_MAP dymq
Z<
} v>_@D@pr
~Q&J\'GQH
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) U05;qKgkDF
//{{AFX_MSG_MAP(CAboutDlg) &"^F;z/
// No message handlers lS4r pbU_
//}}AFX_MSG_MAP &Q3Fgj
END_MESSAGE_MAP() GGp.u@\r
6Ijt2c'A}
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ISGw}# }]?
: CDialog(CCaptureDlg::IDD, pParent) <rBW6o7
{ 'XK 'T\m
//{{AFX_DATA_INIT(CCaptureDlg) PMfW;%I.
m_bControl = FALSE; BpZ~6WtBq
m_bAlt = FALSE; zMsup4cl
m_bShift = FALSE; l~i?
m_Path = _T("c:\\"); iH8we,s'
m_Number = _T("0 picture captured."); B*Tn@t W
nCount=0; GC')50T J
bRegistered=FALSE; X'`n>1z
bTray=FALSE; Zw]"p63eMa
//}}AFX_DATA_INIT )9hqd
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 .9bi%=hP
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Y4rxnXGw
} Lc{AB!Br
ANhqS
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) iXDG-_K
{ 9{u=
CDialog::DoDataExchange(pDX); F7DA~G!
//{{AFX_DATA_MAP(CCaptureDlg) DpRMXo[
DDX_Control(pDX, IDC_KEY, m_Key); W_W !v&@E=
DDX_Check(pDX, IDC_CONTROL, m_bControl); NiZfaC6V
DDX_Check(pDX, IDC_ALT, m_bAlt); RlOy,/-<
DDX_Check(pDX, IDC_SHIFT, m_bShift); Sq5,}oT_{j
DDX_Text(pDX, IDC_PATH, m_Path); \Y4(+t=4
DDX_Text(pDX, IDC_NUMBER, m_Number); B[N]=V
//}}AFX_DATA_MAP ~/L:$
} (!*
l+}
`?z('FV
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) "`qk}n-
//{{AFX_MSG_MAP(CCaptureDlg) =A'>1N
ON_WM_SYSCOMMAND() ,Kv6!ib6Q
ON_WM_PAINT() $|~<6A{y
ON_WM_QUERYDRAGICON() }j/\OY _&
ON_BN_CLICKED(ID_ABOUT, OnAbout) $gl|^c\
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) H8eEBMGo
ON_BN_CLICKED(ID_CHANGE, OnChange) 74([~Qs _M
//}}AFX_MSG_MAP ~su>RolaX
END_MESSAGE_MAP() =t,oj6P~
eKiDc=@
BOOL CCaptureDlg::OnInitDialog() .RroO_H
{ 2xNR=u`
CDialog::OnInitDialog(); b7sfr!t_d
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); HxO+JI`'3
ASSERT(IDM_ABOUTBOX < 0xF000); {y"Kn'1
CMenu* pSysMenu = GetSystemMenu(FALSE); hi(b\ABx
if (pSysMenu != NULL) I'5[8
{ Fl)nmwOc
CString strAboutMenu; e|tx`yA
strAboutMenu.LoadString(IDS_ABOUTBOX); zZMKgFR@
if (!strAboutMenu.IsEmpty()) 1K/HVj+'.
{ Zf$mwRS[_
pSysMenu->AppendMenu(MF_SEPARATOR); |>ztx}\
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); )7.)fY$
} .rBU"Rbo
} ;-3&yQ7N)
SetIcon(m_hIcon, TRUE); // Set big icon G8}owszT
SetIcon(m_hIcon, FALSE); // Set small icon Zq4%O7%
m_Key.SetCurSel(0); lf-.c$.>
RegisterHotkey(); /4+L2O[
CMenu* pMenu=GetSystemMenu(FALSE); .s\lfBo9
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); CzlG#?kU?2
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); (PPC?6s
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); a<-aE4wdm
return TRUE; // return TRUE unless you set the focus to a control _n:RA)4*
} >a975R*g
\:@6(e Bh
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Wrp~OF0k
{ y{M7kYWtHV
if ((nID & 0xFFF0) == IDM_ABOUTBOX) +&\.
]Pp
{ N_92,xI#
CAboutDlg dlgAbout; {`):X _$T
dlgAbout.DoModal(); yV`Tw"p
} GJdL1ptc
else u.A}&'H
{ jTS8
qu
CDialog::OnSysCommand(nID, lParam); k;cIEEdZD
} iY>P7Uvvz
} >)D=PvGlmp
Ys.GBSlHG
void CCaptureDlg::OnPaint() )"?'~ 5A
{ 3D6&0xTq
if (IsIconic()) +tk`$g
{ 4M%|N
CPaintDC dc(this); // device context for painting jwjLxt
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); -~c-mt
// Center icon in client rectangle i=/hLE8T*
int cxIcon = GetSystemMetrics(SM_CXICON); @(c^u;
int cyIcon = GetSystemMetrics(SM_CYICON); Hya.OW{
CRect rect; I:t?# )wl
GetClientRect(&rect); 4Q#{, y944
int x = (rect.Width() - cxIcon + 1) / 2; J<L\IP?%
int y = (rect.Height() - cyIcon + 1) / 2; P84YriLo
// Draw the icon n><ad*|MX
dc.DrawIcon(x, y, m_hIcon); Ytc[ kp
} 0e&&k
else <#8}![3Q
{ 'C}ku>B_r
CDialog::OnPaint(); 2ih}?%H8
} UU(Pg{DA6
} p5qfv>E8)
eaO'|@;{~
HCURSOR CCaptureDlg::OnQueryDragIcon() 1?w=v|b:P)
{ %h(%M'm?
return (HCURSOR) m_hIcon; 9:g A0Z
} 2u-J+
QDj%m %Xd
void CCaptureDlg::OnCancel() )-"<19eu
{ P0; y
if(bTray) j=U"t\{
DeleteIcon(); 0t7)x8c
CDialog::OnCancel(); RSj8T<
} >o13?-S%e
`3jwjy|5
void CCaptureDlg::OnAbout() I++ Le%w
{ .Y2Hd$rs
CAboutDlg dlg; x] `F#5j
dlg.DoModal(); )?OdD7gd
} SFh<>J^ 0a
PSv 5tQhm
void CCaptureDlg::OnBrowse() (;=|2N>7
{ "*/IP9?]
CString str; ewT
K2
BROWSEINFO bi; OLt0Q.{
char name[MAX_PATH]; @f"[*7Q`/
ZeroMemory(&bi,sizeof(BROWSEINFO)); Q}^Ip7T
bi.hwndOwner=GetSafeHwnd(); 1p5'.~J+Q
bi.pszDisplayName=name; \:F$7 *Ne
bi.lpszTitle="Select folder"; fe<7D\Sp@
bi.ulFlags=BIF_RETURNONLYFSDIRS; uv-O`)
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 4$, W\d
if(idl==NULL) Z3MhHvvgp{
return; F5+FO^3E
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); M
hW9^?
str.ReleaseBuffer(); .fqy[qrM
m_Path=str; L'a+1O1q&i
if(str.GetAt(str.GetLength()-1)!='\\') oCE'@}s.i
m_Path+="\\"; |5`ecjb.
UpdateData(FALSE); Q=%W-
} $bKXP(
E@otV6Wk[@
void CCaptureDlg::SaveBmp() {S+?n[1r\
{ D=vw0Q_3Y3
CDC dc; #b&tNZ4!_
dc.CreateDC("DISPLAY",NULL,NULL,NULL); w%TrL+v
CBitmap bm; sZ&6g<8#y
int Width=GetSystemMetrics(SM_CXSCREEN); ts(u7CJd
int Height=GetSystemMetrics(SM_CYSCREEN);
wT19m
bm.CreateCompatibleBitmap(&dc,Width,Height); _1Rw~}O
CDC tdc; %^E7Iqc
tdc.CreateCompatibleDC(&dc); _(?`eWo
CBitmap*pOld=tdc.SelectObject(&bm); K_ymA,&()
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); :sK4mR F
tdc.SelectObject(pOld); s*
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BITMAP btm; Wtw,YFT
bm.GetBitmap(&btm); 6wu`;>
DWORD size=btm.bmWidthBytes*btm.bmHeight; >`&2]Wc)
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); )N~ p4kp
BITMAPINFOHEADER bih; ChUE,)
bih.biBitCount=btm.bmBitsPixel; xx1l Ecj
bih.biClrImportant=0; &QD)1b[U
bih.biClrUsed=0; Z~h6^h
bih.biCompression=0; k7@QFw4 j
bih.biHeight=btm.bmHeight; l="X|t
bih.biPlanes=1; dHiir&Rd9`
bih.biSize=sizeof(BITMAPINFOHEADER); 4x-,l1NMR
bih.biSizeImage=size; K%L6UQ;
bih.biWidth=btm.bmWidth; ^S;{;c+'
bih.biXPelsPerMeter=0; S'$m3,l(k
bih.biYPelsPerMeter=0; *7Y#G8 s
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); qov<@FvE0
static int filecount=0; T=~d.&J
CString name; /N%i6t<xU
name.Format("pict%04d.bmp",filecount++); li?@BHEf
name=m_Path+name; +\%]<YO
BITMAPFILEHEADER bfh; 6
%aaK|0
bfh.bfReserved1=bfh.bfReserved2=0; `WCL-OoZc5
bfh.bfType=((WORD)('M'<< 8)|'B'); 7neJV
bfh.bfSize=54+size; $Yu'B_E6p
bfh.bfOffBits=54; gloG_*W
CFile bf; |uz<)
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <Qv/#
k
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); \reVA$M[
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); tboQn~&4
bf.WriteHuge(lpData,size); '{~[e**
bf.Close(); WvF{`N
nCount++; Q\IViM
} '?m2|9~
GlobalFreePtr(lpData); ipMSMk7gx
if(nCount==1) - |DWPU!"
m_Number.Format("%d picture captured.",nCount); 5tkKd4VfL
else h]~FYY
m_Number.Format("%d pictures captured.",nCount); aqqo>O3 s
UpdateData(FALSE);
%X\A|V&
} )YwEl72c
.H M3s
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) W{q
P/R
{ *)B \M>
if(pMsg -> message == WM_KEYDOWN) *re?V9
{ NL
`
if(pMsg -> wParam == VK_ESCAPE) MUZ]*n&0
return TRUE; >Ho=L)u
if(pMsg -> wParam == VK_RETURN) RuVk>(?WK%
return TRUE; "8ZV%%elp
} [~|k;\2 +
return CDialog::PreTranslateMessage(pMsg); >oyf i:
} bcT_YFLQ
YWd2bRb
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `)]W~
{ D9P,[:"
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ :,v(lq
SaveBmp(); v,Z]Vqk
return FALSE; z8S]FpM6
} Z/: yYSq
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ E Lq1
CMenu pop; ;c]O *\/
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); k0PwAt)65
CMenu*pMenu=pop.GetSubMenu(0); " v
wLj:
pMenu->SetDefaultItem(ID_EXITICON); $ eL-fg
CPoint pt; \VIY[6sn\M
GetCursorPos(&pt); >{~xO 6H
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); WdS1v%
if(id==ID_EXITICON) wTR?8$
DeleteIcon(); I*o6Bn
|D
else if(id==ID_EXIT) H'k~;
OnCancel(); Jpp-3i.F#
return FALSE; '>1M~B
} Z)~?foe'
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 9'~qA(=.?
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) A_ &IK;-go
AddIcon(); M^HYkXn[
return res; [3S17tTc3
} yp=sL' E
h7K,q S
void CCaptureDlg::AddIcon() x4g6Qze
{ yyu -y0_
NOTIFYICONDATA data; 3j$,L(
data.cbSize=sizeof(NOTIFYICONDATA); hmLI9TUe6
CString tip; Kc^ctAk7;
tip.LoadString(IDS_ICONTIP); P%yL{
data.hIcon=GetIcon(0); kzUj)
data.hWnd=GetSafeHwnd(); Oz_CEMcy
strcpy(data.szTip,tip); 3;}YW^oXq
data.uCallbackMessage=IDM_SHELL; "#0P*3-c
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; NW0se
DL
data.uID=98; 3"0QW4A
Shell_NotifyIcon(NIM_ADD,&data); b0h\l#6
ShowWindow(SW_HIDE); [X@{xF^vBQ
bTray=TRUE; af6<w.i
} +RpCh!KP
zCA8}](C^
void CCaptureDlg::DeleteIcon() txnH~;(
{ t'W6Fmwkx
NOTIFYICONDATA data; B[8RBTsA
data.cbSize=sizeof(NOTIFYICONDATA); 7yg{0a
data.hWnd=GetSafeHwnd();
&``nD
data.uID=98; ]P7gEBi
Shell_NotifyIcon(NIM_DELETE,&data); 5lzbg
ShowWindow(SW_SHOW); >#mKM%T2MJ
SetForegroundWindow(); RYC%;h
ShowWindow(SW_SHOWNORMAL); Ym]g0a
bTray=FALSE; &e).l<B
} buzpmRoN)
'CqAjlj
void CCaptureDlg::OnChange() k)F!gV#
{ "
@""
RegisterHotkey(); XZ$g~r
} w >
GW
?Y\WSI?i
BOOL CCaptureDlg::RegisterHotkey() VY~*QF~P
{ @g#| srYD
UpdateData(); "tk1W>liIN
UCHAR mask=0; U$a)lcJd
UCHAR key=0; ;{iTSsb
if(m_bControl) uW[AnQ1w
mask|=4; ~PF,[$?4n
if(m_bAlt) dE[X6$H[
mask|=2; &l{ctP%q
if(m_bShift) leizjL\P
mask|=1; y<`:I|y
key=Key_Table[m_Key.GetCurSel()]; $ <[r3
if(bRegistered){ ;*Y+. ?>a
DeleteHotkey(GetSafeHwnd(),cKey,cMask); -Tuk.>i)
bRegistered=FALSE; Qqb%^}Xx'u
} *Y53bZ
cMask=mask; 3~WI3ZIR
cKey=key; @*op5qVw
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); A9DFZZ0
return bRegistered; at*DYZBjDB
} +dq2}gM
R"t2=3K
四、小结 +ZE"pA^C
y\iECdPU
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。