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:
dq8 /^1P
b$
x"&& 一、实现方法
PPqTmx5S j^ _I{ 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:
3N
bn|_`( !Q(xOc9>Ug #pragma data_seg("shareddata")
}g*-Ty HHOOK hHook =NULL; //钩子句柄
@*uX[) UINT nHookCount =0; //挂接的程序数目
QB.'8B_ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
{''|iwLr static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
B![5+ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
'iVo,m[yKU static int KeyCount =0;
BH-[q9pf static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
*QG3 Jz #pragma data_seg()
YMi(Cyja& r~}}o o4K 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。
)*A,L% '<0q"juXE 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:
q%k+x) TN
%"RL BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
bSr 'ji cKey,UCHAR cMask)
Z M+Hb_6f {
tRy
D@} BOOL bAdded=FALSE;
FR}H$R7# for(int index=0;index<MAX_KEY;index++){
.?p}: if(hCallWnd[index]==0){
2&Byq hCallWnd[index]=hWnd;
R2$ U K HotKey[index]=cKey;
Vf?#W,5>= HotKeyMask[index]=cMask;
yo*iv+l bAdded=TRUE;
/,Rca1W KeyCount++;
gr
5]5u
break;
rEhf_[Dv }
j&/.[?K }
=GQ^uVf1 return bAdded;
y^AA#kk }
N4To#Q1w //删除热键
ys/mv'#> BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Q@2tT&eL {
GVEWd/:X( BOOL bRemoved=FALSE;
u!uDu,y for(int index=0;index<MAX_KEY;index++){
Y(y9l{' if(hCallWnd[index]==hWnd){
W"kw>JEt if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
VWshFI hCallWnd[index]=NULL;
&{ {DS HotKey[index]=0;
1qC:3
;P HotKeyMask[index]=0;
%]ayW$4 bRemoved=TRUE;
R1.sq(z` KeyCount--;
@ >(u:. break;
i$ L]X[ }
*|HZ&} }
j/9QV }
=4e=wAO(i return bRemoved;
TJXraQK-= }
<KwK
tgzs Uk:.2%S2 cU*lB! DLL中的钩子函数如下:
vSYKe !/}FPM_ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
,%h!% nz! {
R9l7CJM@ BOOL bProcessed=FALSE;
&ZE\@Vc if(HC_ACTION==nCode)
;x-H$OZX {
|2@en=EYk if((lParam&0xc0000000)==0xc0000000){// 有键松开
S7kT3zB switch(wParam)
9"aFS=>< {
4$aO;Z_ case VK_MENU:
z@~&Kwf\} MaskBits&=~ALTBIT;
hRr1#'& break;
Y_@"v#, case VK_CONTROL:
A$~xG( MaskBits&=~CTRLBIT;
jRG\C=&(x break;
$W$# CTM case VK_SHIFT:
ZB[(Tv1 MaskBits&=~SHIFTBIT;
g?~ Tguv break;
+oy&OKCa default: //judge the key and send message
m`$>:B break;
V+qJrZ,i }
g6g$nY@Jm for(int index=0;index<MAX_KEY;index++){
lmQ 6X if(hCallWnd[index]==NULL)
#jZ@l3 continue;
{KDgK if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
KO|pJ3 {
"W@XP+POAY SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
0i\',h}9 bProcessed=TRUE;
h4anr7g{ }
EF=dXm/\ }
NGD*ce"w }
Q0cY/'>4 else if((lParam&0xc000ffff)==1){ //有键按下
ck+b/.gw` switch(wParam)
qon{
g {
tKZ&1E case VK_MENU:
`\jTpDV_W MaskBits|=ALTBIT;
ISS\uj63M break;
s8_aL)@f case VK_CONTROL:
|=cCv_y MaskBits|=CTRLBIT;
m1-\qt-yy break;
*AH^%!kVP case VK_SHIFT:
[8@kx Cq MaskBits|=SHIFTBIT;
i
u1KRuaF[ break;
iS1Gb$? default: //judge the key and send message
U,<]J*b(@4 break;
/zG+] }
gcg>Gjp for(int index=0;index<MAX_KEY;index++){
^Cg^`n?@b if(hCallWnd[index]==NULL)
e3eVvl5] continue;
ejklpa ./ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$(gGoL< {
fpvvV( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
1OJ*wI* bProcessed=TRUE;
|mxNUo- }
S<nP80C }
.G}k/`a }
w<65S if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
PW%1xHLfk for(int index=0;index<MAX_KEY;index++){
5g``30:o if(hCallWnd[index]==NULL)
WRD
A ` continue;
2@ 9pr if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
>?5xDbRj SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
fw' r. //lParam的意义可看MSDN中WM_KEYDOWN部分
MBB5wj }
lwOf)jK:J }
s>|Z7[* }
0e+W/Tq return CallNextHookEx( hHook, nCode, wParam, lParam );
3;a
R\:p@w }
,?g=U8y| sEce{"VC 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
^/>Wr'w 4\N_ G
@ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
J/'M N BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
#JA}LA"l 5"JU?e59M 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
2{ o0@ [ -ISR7D LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
|2)Sd[q {
r C_d$Jv if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
hq<5lE^ {
TDlZ!$g( //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
3J%V%}mD SaveBmp();
q2e]3{l3 return FALSE;
bj@xqAGl }
6&89~W{
…… //其它处理及默认处理
yl-fbYH }
iJdP>x 2sKG(^=Z .^i<xY 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。
k(P3LJcYQ )Zas
x6` 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。
vsKl#R B (I4y[jnD 二、编程步骤
[O2h-` +YTx
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";
&Y1`?1;nw .APVjqG 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
}A|))Ao| (w+%=z"M 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:#Ok+ S5N@\ x 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;
3bH~';<
tPA:_ 5、 添加代码,编译运行程序。
p8=|5. Qyz>ZPu}sz 三、程序代码
{XtoiI ~r<p@k=.#0 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
q7,^E`5EgU #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
<_9!
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
nbGoJC:U #if _MSC_VER > 1000
6xHi\L #pragma once
sAi&A9"* #endif // _MSC_VER > 1000
`(!NYx #ifndef __AFXWIN_H__
6lsL^]7 #error include 'stdafx.h' before including this file for PCH
*>k!hq;j #endif
Q',m{;; #include "resource.h" // main symbols
EX:{EmaT class CHookApp : public CWinApp
W,3zL.qH" {
o(qEkR:4kd public:
/xySwSmh3 CHookApp();
3 > |uF // Overrides
3 jF|Ic // ClassWizard generated virtual function overrides
-#aZF2z //{{AFX_VIRTUAL(CHookApp)
&]< 3~6n public:
O)uOUB virtual BOOL InitInstance();
66Gx.tE virtual int ExitInstance();
(SF1y/g@= //}}AFX_VIRTUAL
asr=m{C" //{{AFX_MSG(CHookApp)
R2 lXTW* // NOTE - the ClassWizard will add and remove member functions here.
|5,<jyp // DO NOT EDIT what you see in these blocks of generated code !
>
\3ah4"o //}}AFX_MSG
&~#iIk~% DECLARE_MESSAGE_MAP()
D`VFf\7 };
Vclr2]eV4O LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
=_
y\Y@J
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
%c X"#+e BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
M)JADX BOOL InitHotkey();
+I52EXo BOOL UnInit();
rB%y6P B #endif
|SQ|qbe= )11W)G`w //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
QR"bYQ #include "stdafx.h"
=&Xdm( #include "hook.h"
0|XKd24BN #include <windowsx.h>
=Vb~s+YW #ifdef _DEBUG
,
T\- ;7 #define new DEBUG_NEW
&>(gt<C$ #undef THIS_FILE
T%(C-Quh static char THIS_FILE[] = __FILE__;
\"x>JW4w #endif
:)IV!_>'d #define MAX_KEY 100
/L&M,OUcr. #define CTRLBIT 0x04
cy|%sf` #define ALTBIT 0x02
Oz{%k#X- #define SHIFTBIT 0x01
Qz+sT6js- #pragma data_seg("shareddata")
jl}$HEI5m} HHOOK hHook =NULL;
]JjK#eh UINT nHookCount =0;
:l,OalO static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
J02^i5l static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Es.nHN^]%K static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
1fFj:p./l_ static int KeyCount =0;
J}TfRrf static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
y+U83a[L* #pragma data_seg()
J8<J8x4 HINSTANCE hins;
_D,eyP9P void VerifyWindow();
5mgHlsDzu BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
y-B=W]E //{{AFX_MSG_MAP(CHookApp)
*C6 D3y // NOTE - the ClassWizard will add and remove mapping macros here.
51 b y // DO NOT EDIT what you see in these blocks of generated code!
~W03{9(Vp8 //}}AFX_MSG_MAP
l -.(Ez* END_MESSAGE_MAP()
{38\vX,I(w Z\? E3j CHookApp::CHookApp()
aV6#t*\J {
V8PLFt; // TODO: add construction code here,
"DQ'C%sL9 // Place all significant initialization in InitInstance
m\vmY }
pSfYu=#f ? \m3~6y CHookApp theApp;
@{d\j]Nw LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
>7b)y {
ZFvyL8o BOOL bProcessed=FALSE;
p[v#EyoC if(HC_ACTION==nCode)
9(, @aZ {
Y3'," if((lParam&0xc0000000)==0xc0000000){// Key up
-5bA
$ switch(wParam)
rmd;\)#*` {
@r;wobt case VK_MENU:
0$HmY2
Men MaskBits&=~ALTBIT;
2e1]}wlK break;
27D!'S case VK_CONTROL:
)oU)}asY MaskBits&=~CTRLBIT;
W5pb;74| break;
5`-UMz<] case VK_SHIFT:
PaO-J&< MaskBits&=~SHIFTBIT;
qlsQ|/'D break;
O1P=#l iYX default: //judge the key and send message
7G93,dJ break;
j9R6ta3\l }
K84^Oq for(int index=0;index<MAX_KEY;index++){
^G|98yc!' if(hCallWnd[index]==NULL)
xT*d/Oa w continue;
Ug%_@t/? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
jQh^WmN {
{Wv%zA*8 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
!EBY@ Y1 bProcessed=TRUE;
0Scm?l3 }
\9{F5Sz }
E167=BD9< }
e3[:D5 else if((lParam&0xc000ffff)==1){ //Key down
:c.JhE3D switch(wParam)
06mlj6hV {
K@u&(} case VK_MENU:
3x@<Z68S MaskBits|=ALTBIT;
)9v`f9X){ break;
Dg>^A case VK_CONTROL:
=!b6FjsiG MaskBits|=CTRLBIT;
6^)}PX= * break;
LM)`CELsYc case VK_SHIFT:
f{&bOF v MaskBits|=SHIFTBIT;
?GT@puJS- break;
@T-p2#& default: //judge the key and send message
[A2`]CE<@ break;
(Ddp|a"b }
Pm{*.AW1 for(int index=0;index<MAX_KEY;index++)
T*[
VY1 {
w:i:~f . if(hCallWnd[index]==NULL)
,!#ccv+Vm% continue;
Q<(YP.k if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
e Y$qV} {
_5Bcwa/ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
&^".2)zU bProcessed=TRUE;
O;9?(:_ }
)_7>nuQ6 }
u1^wDc*xg }
{QAv~S>4 if(!bProcessed){
mpw~hW0- for(int index=0;index<MAX_KEY;index++){
ZWUP^V if(hCallWnd[index]==NULL)
3gZ8.8q3 continue;
W"q@Qa`Bm if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
*OjKcs SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
An`3Ex[
}
GW^,g@%C }
Orn0Zpp<z }
) c2_b return CallNextHookEx( hHook, nCode, wParam, lParam );
1bnBji }
eU@Cr7@,| iq$$+y, BOOL InitHotkey()
w'T q3-%V {
-~{c
u47_ if(hHook!=NULL){
K2)!h.W nHookCount++;
dl-l"9~; return TRUE;
b7`D|7D }
`:NaEF?Sj else
d3Mva,bw< hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
,:2'YB if(hHook!=NULL)
LNYKm~cN nHookCount++;
=='Td[ return (hHook!=NULL);
r,1e 'd: }
}T2xXbU BOOL UnInit()
k?B[>aQn.0 {
dihjpI_ if(nHookCount>1){
Uz7oL8 nHookCount--;
%r\n%$@_ return TRUE;
'9p@vi{\ }
eV^d6T$ BOOL unhooked = UnhookWindowsHookEx(hHook);
YY((#"o;l if(unhooked==TRUE){
D/y bFk nHookCount=0;
hwYQGtjF hHook=NULL;
H6*^Ga }
y9H%
Xl return unhooked;
<xpph
t< }
ZUm?*.g\^ 9m2, qr| BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
M9\#Aq&\i {
&)wiKh"$ BOOL bAdded=FALSE;
I=)hWC/ for(int index=0;index<MAX_KEY;index++){
6RO(]5wX if(hCallWnd[index]==0){
C$h<Wt=< hCallWnd[index]=hWnd;
yOU(2"8p HotKey[index]=cKey;
2jJmE&)7, HotKeyMask[index]=cMask;
s9;#!7ms bAdded=TRUE;
tc;'oMUP KeyCount++;
Qj{8?lew break;
|~`as(@Ih }
+d}E&=p_ }
>^Q&nkB"B return bAdded;
O|IG_RL] }
BF*kb2"GZ6 $
i)bq6 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
^ 2GHe<Y {
2,2Z`X BOOL bRemoved=FALSE;
C&LBr| for(int index=0;index<MAX_KEY;index++){
2"P99$" if(hCallWnd[index]==hWnd){
6k{2 +P if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
8
;d$54
b hCallWnd[index]=NULL;
{'sY|lou HotKey[index]=0;
N[]Hc HotKeyMask[index]=0;
1d"Z>k:mn bRemoved=TRUE;
T3UMCqc= KeyCount--;
zLs|tJOVp break;
@+vXMJ $ }
>WJf=F`_H }
K5ZC:Ks }
l:0s2 return bRemoved;
;7]u!Q }
5,qj7HZF _R'Fco void VerifyWindow()
'|]e<Mt- {
Q)m4_+,d for(int i=0;i<MAX_KEY;i++){
?&G`{Ey if(hCallWnd
!=NULL){ E1dD7r\
if(!IsWindow(hCallWnd)){ ^'CPM6J
hCallWnd=NULL; n~"$^Vr
HotKey=0; <?-YTY|
HotKeyMask=0; w{[=l6L m
KeyCount--; 4%4avEa"w
} (fNUj4[
} v 8T$ &-HJ
} 'w>_+jLT
} 0nn okN^
mpAR7AG6
BOOL CHookApp::InitInstance() W>r#RXmh
{ ?]fF3 SJk
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 2XTPBZNe
hins=AfxGetInstanceHandle(); bmN q[}
InitHotkey(); tO7v4
return CWinApp::InitInstance(); LTNj| u
} 3!Sp0P
:q8b;*:
int CHookApp::ExitInstance() 3czeTj
{ UNijFGi
VerifyWindow(); =PRx?q`d
UnInit(); S)QAXjH
return CWinApp::ExitInstance(); ;Op3?_
} +4[^!q*
H
Vd".u'r
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file b KTcZG
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) tQZs.1=z
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ &PkLp4mQ
#if _MSC_VER > 1000 Y2xL>F
#pragma once @L.82p{h
#endif // _MSC_VER > 1000 Um1[sMc{au
Z3>N<u8)
class CCaptureDlg : public CDialog a#mNE*Dg
{ F'g Vzf
// Construction ]\/tVn.'
public: jV.g}F+1m
BOOL bTray; 4}_O`Uxh
BOOL bRegistered; a+hd(JX0~
BOOL RegisterHotkey(); o]nw0q?
UCHAR cKey; `cPywn@uGZ
UCHAR cMask; REZJ}%}/
void DeleteIcon(); S3L~~X/=
void AddIcon(); uwRr LF
UINT nCount; fLV"T_rk
void SaveBmp(); %6AW7q
t
CCaptureDlg(CWnd* pParent = NULL); // standard constructor KD/V aN
// Dialog Data pF
^#}L
//{{AFX_DATA(CCaptureDlg) #cj6{%c4
enum { IDD = IDD_CAPTURE_DIALOG }; /R>nr"
CComboBox m_Key; MCU_Z[N#10
BOOL m_bControl; *~m+Nc`D,N
BOOL m_bAlt; 8ElKD{.BU8
BOOL m_bShift; Z%I
CString m_Path; ;'81jbh
CString m_Number; 2o>)7^9|#<
//}}AFX_DATA _qbIh
// ClassWizard generated virtual function overrides {Fzs@,|W.
//{{AFX_VIRTUAL(CCaptureDlg) f;}EhG'
public: !"e5~7
virtual BOOL PreTranslateMessage(MSG* pMsg); n@ w^V
protected: sAg Kg=)
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support P&Pj>!T5
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); mv5n4mav
//}}AFX_VIRTUAL yLsz8j-QJ
// Implementation e/->_T(I
protected: -P&6L\V
HICON m_hIcon; Lm@vXgMD
// Generated message map functions "V&+7"Q
//{{AFX_MSG(CCaptureDlg) `"qP
virtual BOOL OnInitDialog(); 0IQ'3_
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {.yStB.T
afx_msg void OnPaint(); ]xguBh ]
afx_msg HCURSOR OnQueryDragIcon(); E*# ]**
virtual void OnCancel(); ?$e9<lsQq)
afx_msg void OnAbout(); `DT3x{}_S
afx_msg void OnBrowse(); 8k(P,o
afx_msg void OnChange(); upeU52@\
//}}AFX_MSG C7H/N<VAq
DECLARE_MESSAGE_MAP() DJP2IP
}; -hkQ2[Ew#
#endif [:^-m8QC
K|DWu8
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 88c<:fK
#include "stdafx.h" C&++VRnm
#include "Capture.h" ~rjTF!
#include "CaptureDlg.h" 5OoN!TEM
#include <windowsx.h> }du XC[ 6
#pragma comment(lib,"hook.lib") :VF<9@t
#ifdef _DEBUG lg047K
#define new DEBUG_NEW lV.F,3
#undef THIS_FILE ho>k$s?
static char THIS_FILE[] = __FILE__; QdLYCR4f
#endif U%h);!<
#define IDM_SHELL WM_USER+1 xQw7 :18wQ
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); V7TVt,-3
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u*qV[y5Bl
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; rp5(pV7*
class CAboutDlg : public CDialog
BUwONF
{ RxMH!^
public: ORu2V#Z[
CAboutDlg(); -{`@=U
// Dialog Data |Yq$sU
//{{AFX_DATA(CAboutDlg) c{[q>@y
pK
enum { IDD = IDD_ABOUTBOX }; A>{p2?`+!
//}}AFX_DATA o!4!"O'E
// ClassWizard generated virtual function overrides lY*[tmz)
//{{AFX_VIRTUAL(CAboutDlg) UX]L;kI
protected: F#|:`$t
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,t)x{I;C)
//}}AFX_VIRTUAL U35AX9/
// Implementation kh%{C]".1
protected: jYiv'6z
//{{AFX_MSG(CAboutDlg) >J u]2++lx
//}}AFX_MSG :_Eqf8T
DECLARE_MESSAGE_MAP() Jk0r&t7
}; .rPn5D Y
%r4q8-
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 6i0A9SN
{ ZylJp8U
//{{AFX_DATA_INIT(CAboutDlg) 7OjR._@
//}}AFX_DATA_INIT 8( btZt
} z"*/mP2
c$wsH25KH8
void CAboutDlg::DoDataExchange(CDataExchange* pDX) r[?1
{ h[Gg}N!
CDialog::DoDataExchange(pDX); ^[15&T5
//{{AFX_DATA_MAP(CAboutDlg) WoxwEi1~0
//}}AFX_DATA_MAP 0j C3fT!n
} M`6y@<
#M A4
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) #[#KL/i)$
//{{AFX_MSG_MAP(CAboutDlg) m~uOXb
// No message handlers y*MF&mQ[
//}}AFX_MSG_MAP f@co<iA
END_MESSAGE_MAP() %p
X6QRt?
f-nz{U
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Y'e eA 2O
: CDialog(CCaptureDlg::IDD, pParent) \p%3vRwS%p
{ sZ?mP;Q
//{{AFX_DATA_INIT(CCaptureDlg) @,XSs
m_bControl = FALSE; 2 1PFR:lP7
m_bAlt = FALSE; sl*5Y#,|1
m_bShift = FALSE; I5h[%T
m_Path = _T("c:\\"); @]bPVG?d
m_Number = _T("0 picture captured."); g:0#u;j^7
nCount=0; _j_x1.l
bRegistered=FALSE; 'H7x L
bTray=FALSE; d,$d~alY
//}}AFX_DATA_INIT ,.gQ^^+=
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 'EFyIVezg9
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); z4 E|Ai
} id?h >g
xooY'El*#
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) yUPIY:0
{ jjM{]
CDialog::DoDataExchange(pDX); pKS
{ 6P
//{{AFX_DATA_MAP(CCaptureDlg) {-BRt)L[
DDX_Control(pDX, IDC_KEY, m_Key); f3|@|'
;
DDX_Check(pDX, IDC_CONTROL, m_bControl); fqu}Le
DDX_Check(pDX, IDC_ALT, m_bAlt); 9_sA&2P{uV
DDX_Check(pDX, IDC_SHIFT, m_bShift); rxme(9M
DDX_Text(pDX, IDC_PATH, m_Path); >3u]OSb
DDX_Text(pDX, IDC_NUMBER, m_Number); Q?AmOo-a
//}}AFX_DATA_MAP N$[$;Fm:
} lgpW@g
9Ct`
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ud fe
//{{AFX_MSG_MAP(CCaptureDlg) ddVa.0Z!<
ON_WM_SYSCOMMAND() G^"Vo x4
ON_WM_PAINT() KN"S?i]X
ON_WM_QUERYDRAGICON() eiJ2NwR\w
ON_BN_CLICKED(ID_ABOUT, OnAbout) wM_c48|d
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) hXGwP4
ON_BN_CLICKED(ID_CHANGE, OnChange) /*Qq[C
//}}AFX_MSG_MAP XlI!{qj|
END_MESSAGE_MAP() R}mn*h6
^s.V;R
BOOL CCaptureDlg::OnInitDialog() mZIoaF>t
{ n&MG7`]N
CDialog::OnInitDialog(); "7>>I D
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); f&D]anf33
ASSERT(IDM_ABOUTBOX < 0xF000); flgRpXt
CMenu* pSysMenu = GetSystemMenu(FALSE); wM[~2C=vx
if (pSysMenu != NULL) mJB2)^33a
{ PA w-6;
CString strAboutMenu; _7DkS}NJs
strAboutMenu.LoadString(IDS_ABOUTBOX); CQ;]J=|<_
if (!strAboutMenu.IsEmpty()) A8A~!2V
{ ;6
+}z~
pSysMenu->AppendMenu(MF_SEPARATOR); .Wi{lt
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); a^5^gId5l!
} {G*A.$-d
} ceGa([#!\_
SetIcon(m_hIcon, TRUE); // Set big icon e4FM} z[
SetIcon(m_hIcon, FALSE); // Set small icon 1y^K/.5-
m_Key.SetCurSel(0); #y|V|nd
RegisterHotkey(); d3^OEwe
CMenu* pMenu=GetSystemMenu(FALSE); rw)kAe31
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 0ult7s}
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); /J)l /oI
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Jw~( G9G
return TRUE; // return TRUE unless you set the focus to a control ``ekR6[ 8c
} *Ywpz^2?:
80M;4nH^5
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) R_sC! -
{ 2wqk,c[]
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 8vk..!7n}
{ ^[Cv26
CAboutDlg dlgAbout; w<9>Q1(
dlgAbout.DoModal(); 5BR5X\f0
} ZDL']*)'
else U}Hwto`R
{ x ]5@>5
CDialog::OnSysCommand(nID, lParam); ]\RRqLDzkg
}
>ds%].$-\
} 0tk#Gs[
VCy5JH
void CCaptureDlg::OnPaint() I &* _,d
{ YJxw 'U
>P
if (IsIconic()) Ff^@~X+W<
{ #<( = }?
CPaintDC dc(this); // device context for painting c^8o~K>w84
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ,a?\MM9$
// Center icon in client rectangle 1p`+
int cxIcon = GetSystemMetrics(SM_CXICON); SvvUkQ#1w
int cyIcon = GetSystemMetrics(SM_CYICON); TgU**JN)
CRect rect; ;jK#[*y
GetClientRect(&rect);
t4Z
int x = (rect.Width() - cxIcon + 1) / 2; PCc|}*b
int y = (rect.Height() - cyIcon + 1) / 2; +&KQ28r
// Draw the icon (wRBd
dc.DrawIcon(x, y, m_hIcon); =\ )IaZ
} /W#O +
else b4Y8N"hL%
{ RnfXN)+P
CDialog::OnPaint(); +kdySWF
} mxSKG>
O
} !0/z>#b
!~<siy
HCURSOR CCaptureDlg::OnQueryDragIcon()
IGX:H)&*
{ O gmO&cE
return (HCURSOR) m_hIcon; xa( m5P
} 2}}?'PwwT
#y]3LC#)^G
void CCaptureDlg::OnCancel() yj@tV2
{ M4Z@O3OIE
if(bTray) ANH4IYd3
DeleteIcon(); P,gdnV
^
CDialog::OnCancel(); 151tXSzLT
} "fQRk
x2|6
void CCaptureDlg::OnAbout() P4
ul[zZ
{ PBks`
|+
CAboutDlg dlg; RK9>dkW
dlg.DoModal(); -jg (G GJ
} /7$mxtB5%L
47 u@4"M
void CCaptureDlg::OnBrowse() E(<LvMiCa
{ +V v+K(lh$
CString str; ZeasYSo4P
BROWSEINFO bi; $7I]`Jt
char name[MAX_PATH]; _8K%`6!"Z
ZeroMemory(&bi,sizeof(BROWSEINFO)); 9Z\z96O-
bi.hwndOwner=GetSafeHwnd(); V'Y{v
bi.pszDisplayName=name; xFp<7p
L
bi.lpszTitle="Select folder"; aI#4H+/
bi.ulFlags=BIF_RETURNONLYFSDIRS; #`tD1T{;
LPITEMIDLIST idl=SHBrowseForFolder(&bi);
yeD_j/
if(idl==NULL) U6 82Th
return; ?SY<~i<K-
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 71B3a
str.ReleaseBuffer(); YTY%#"
m_Path=str; 4YbC(f
if(str.GetAt(str.GetLength()-1)!='\\') e/e0d<(1
m_Path+="\\"; dhRJg"vrQ
UpdateData(FALSE); `0BdMKjA
} a
ib}`l
^[h2% c$
void CCaptureDlg::SaveBmp() 2xmk,&s
{ (0*v*kYdL+
CDC dc; nYv#4*
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ^6 /j_G
CBitmap bm; "2n;3ByR
int Width=GetSystemMetrics(SM_CXSCREEN); L9IGK<
int Height=GetSystemMetrics(SM_CYSCREEN); ]S8LY.Az5
bm.CreateCompatibleBitmap(&dc,Width,Height); n~z\?Y=*
CDC tdc; G=M] 8+h
tdc.CreateCompatibleDC(&dc); 0V11#
CBitmap*pOld=tdc.SelectObject(&bm); -oBI+v&
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); AfWl6a?T8:
tdc.SelectObject(pOld); rFag@Z"["
BITMAP btm; #!!AbuhzK{
bm.GetBitmap(&btm); >.dHt\
DWORD size=btm.bmWidthBytes*btm.bmHeight; 4E"d /
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ='/Z;3jt]x
BITMAPINFOHEADER bih; O OlTrLL
bih.biBitCount=btm.bmBitsPixel; +!&$SNLh(
bih.biClrImportant=0; :B#EqeI
bih.biClrUsed=0; y~#\#w{
bih.biCompression=0; ZW ye>]
bih.biHeight=btm.bmHeight; 2o{@nN8%
bih.biPlanes=1; %= u/3b:o
bih.biSize=sizeof(BITMAPINFOHEADER); $>vy(Y
bih.biSizeImage=size; m^$5K's&
bih.biWidth=btm.bmWidth; qMgfMhQ7DU
bih.biXPelsPerMeter=0; hN4VlNKu
bih.biYPelsPerMeter=0; &zN@5m$k;
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); `!c,y~r[
static int filecount=0; .K9l*-e[=
CString name; cqQRU
name.Format("pict%04d.bmp",filecount++); *m_93J
name=m_Path+name; CV^0.
BITMAPFILEHEADER bfh; ]xq::a{Oy
bfh.bfReserved1=bfh.bfReserved2=0; ko[TDh$T5
bfh.bfType=((WORD)('M'<< 8)|'B'); Vq}r_#!Q
bfh.bfSize=54+size; G:+16XCra
bfh.bfOffBits=54; 7~.ZE
CFile bf; {;RF
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ^tE_LL+ji|
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Z H-5Qy_
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); *caLN,G
bf.WriteHuge(lpData,size); M'u=H
bf.Close(); ,RK3eQ
nCount++; ?vu|o'$T,
} ZO7bSxAN-
GlobalFreePtr(lpData); KSOO?X0j
if(nCount==1) u( 9X
m_Number.Format("%d picture captured.",nCount); UD*+"~
else >~&(P_<b
m_Number.Format("%d pictures captured.",nCount); x YT}>#[
UpdateData(FALSE); 3_J>y
} +Jw{qQR/*
i| xt f
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ``-k{C#F
{ ^g]xU1] *
if(pMsg -> message == WM_KEYDOWN) =x4a~=HX
{ 9--dRTG
if(pMsg -> wParam == VK_ESCAPE) =h\E<dw
return TRUE; "]<}Hy
if(pMsg -> wParam == VK_RETURN) ]31$KBC
return TRUE; F50JJZ
} eUs-5
L
return CDialog::PreTranslateMessage(pMsg); ;f(n.i
} =jUnM>23
56ZrCr
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) jM\ %$_/
{ DyX0xx^
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ G;2[
SaveBmp(); ?>)yKa# U
return FALSE; h2&y<Eg >
} Vi,Y@+4
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Y`]rj-8f0B
CMenu pop; c(:Oyba
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); b]K>vhQV
CMenu*pMenu=pop.GetSubMenu(0); WY.5K
=}
pMenu->SetDefaultItem(ID_EXITICON); U3VT*nj'
CPoint pt; S>EDL
GetCursorPos(&pt); E!dp~RwZu
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); /hfUPO5
if(id==ID_EXITICON) wiBuEaUkW
DeleteIcon(); fM9xy \.
else if(id==ID_EXIT) /#IH-2N
OnCancel(); 1)Eq&ASB
return FALSE; {_Np<r;j<
}
|`v^ d|
LRESULT res= CDialog::WindowProc(message, wParam, lParam); \P?--AIq<
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~ a>S#S
AddIcon(); dgY5ccP
return res; ecT]p
} s[Gswd
<)J55++
void CCaptureDlg::AddIcon() Re\o
v x9
{ }6@%((9E2
NOTIFYICONDATA data; W+/2c4$F3
data.cbSize=sizeof(NOTIFYICONDATA); h.D^1
CString tip; r"[L0Cbb
tip.LoadString(IDS_ICONTIP); fr]Hc+7
data.hIcon=GetIcon(0); UhBz<>i;!
data.hWnd=GetSafeHwnd(); 'v+96b/;
strcpy(data.szTip,tip); /=-h:0{M
data.uCallbackMessage=IDM_SHELL; 8'%+G
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; lux9o$ %
data.uID=98; rxArTpS{.#
Shell_NotifyIcon(NIM_ADD,&data); X_!$Pk7ma
ShowWindow(SW_HIDE); _;VYFs
bTray=TRUE; .Map
} K_FBy
a^x
0 l
void CCaptureDlg::DeleteIcon() ja:\W\xhJ
{ ME,duY/>Q
NOTIFYICONDATA data; 8ur_/h7
data.cbSize=sizeof(NOTIFYICONDATA); XJ
_%!
data.hWnd=GetSafeHwnd(); ZgK@Fl*k
data.uID=98; tB!|p 6
Shell_NotifyIcon(NIM_DELETE,&data); gvK"*aIj
ShowWindow(SW_SHOW); ^:U;rHY
SetForegroundWindow(); g.=!3e&z%
ShowWindow(SW_SHOWNORMAL); 6iyt2qkh
bTray=FALSE;
Jb6&
} Mi;Tn;3er
8W{ g
void CCaptureDlg::OnChange() gi
'^qi2
{ Yr:>icz|
RegisterHotkey(); qm~Kw!kV
} .GtINhz*
6eOxF8
BOOL CCaptureDlg::RegisterHotkey() )biX8yqhR
{ |B,dEx/uU
UpdateData(); WE7>?H*Ro
UCHAR mask=0; R,XD6' Q
UCHAR key=0; bf{Ep=-
if(m_bControl) VgUvD1v?}
mask|=4; hN!.@L
if(m_bAlt) k:W=5{[
mask|=2; m/cx|b3hqv
if(m_bShift) l; */M.B
mask|=1; OY$7`8M[
key=Key_Table[m_Key.GetCurSel()]; 9.jG\i
if(bRegistered){ OfW%&LAMQ
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ~LSy7$rz
bRegistered=FALSE; YqkA&qL]#;
} @RQ+JYQi
cMask=mask; :E}6S
cKey=key; Jr|K>
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); YALyZ.d
return bRegistered; w:n(pLc<
} Un~]Q?w
z)r8?9u
四、小结 \gjl^#;
Y{`3`Pg&N
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。