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:
XD|&{/O VS}Vl 一、实现方法
$~:hv7% @x=CMF15 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
rBny*! n QY^ y(I49 #pragma data_seg("shareddata")
N@A#e/8 HHOOK hHook =NULL; //钩子句柄
xE)pj| UINT nHookCount =0; //挂接的程序数目
KX9ZwsC0 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
k~q[qKb8y: static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
+pFz&)? static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
#);
6+v static int KeyCount =0;
ED$gnFa3I static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
RMvlA'c #pragma data_seg()
|RjjP 7 d->b9 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。
KK] >0QAY ar^`r!ABEh 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:
SjJUhTb &c\8`# 6 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Yb6\+}th cKey,UCHAR cMask)
tjTF?>^6| {
QWxQD'L' BOOL bAdded=FALSE;
o3W5FHFAv for(int index=0;index<MAX_KEY;index++){
?.Kl/8ml if(hCallWnd[index]==0){
zh4o<f:- hCallWnd[index]=hWnd;
lO) B/N& HotKey[index]=cKey;
I+<; Dsp HotKeyMask[index]=cMask;
&G"]v]V bAdded=TRUE;
IcIMa KeyCount++;
.9ROa#7U;n break;
nut7b }
ILVbbC`D }
<y'ttxeS return bAdded;
@+2Zt% }
hT
Xc0 //删除热键
brVT BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
:5Vu.\,1 {
jxoEOEA BOOL bRemoved=FALSE;
*1%g=vb for(int index=0;index<MAX_KEY;index++){
qMUqd}=P if(hCallWnd[index]==hWnd){
Jg Xbs+. if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
cbteNA!> hCallWnd[index]=NULL;
C9nNziws HotKey[index]=0;
!*cf}<Kmw HotKeyMask[index]=0;
EP8LJzd" bRemoved=TRUE;
y%GV9 KeyCount--;
gTq-\k( break;
[Dt\E4 }
zH_q6@4 }
l9jcoVo. }
K:Ap|F return bRemoved;
\.{JS>! }
Kr#=u~~M 'v,W
gPe :#L B}=HQ DLL中的钩子函数如下:
K)14v;@ <AIsNqr LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
cK258mY {
$wN .~"T BOOL bProcessed=FALSE;
980+Y if(HC_ACTION==nCode)
3LTO+>, |" {
jsG9{/Ov3 if((lParam&0xc0000000)==0xc0000000){// 有键松开
af_zZf!0 switch(wParam)
f>'7~69 {
DTJ case VK_MENU:
O3_Mrn(R MaskBits&=~ALTBIT;
ZHBwoC#5} break;
Z5U~g? case VK_CONTROL:
PY2`RZ/ @ MaskBits&=~CTRLBIT;
)CmuC@ Q" break;
G]S E
A case VK_SHIFT:
CVUDN2 MaskBits&=~SHIFTBIT;
A1@-;/H3 break;
;klDt|%3j default: //judge the key and send message
63f/-64?7 break;
f^]AyU;F: }
a}
/Vu" for(int index=0;index<MAX_KEY;index++){
\uYUX~}i" if(hCallWnd[index]==NULL)
7q?YdAUz continue;
L=p.@VSZ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
r" D |1 {
2iGRw4`_a SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
w iq{Jo# bProcessed=TRUE;
b^xf,`D }
dnx}c4P }
}/LYI }
i~,k2*o else if((lParam&0xc000ffff)==1){ //有键按下
Y[H_?f=;% switch(wParam)
YOY+z\Q {
G^R;~J*TDE case VK_MENU:
Cb13 Qz MaskBits|=ALTBIT;
NqWHR~& break;
i-<=nD&?t case VK_CONTROL:
GBQb({ MaskBits|=CTRLBIT;
j@ "`!uPz break;
i`Yf|^;@2> case VK_SHIFT:
9j 8t<5s MaskBits|=SHIFTBIT;
D;L :a`Y break;
`~RV default: //judge the key and send message
5bw]cv$i break;
79V5{2Y*U }
bDkE*4SRX for(int index=0;index<MAX_KEY;index++){
!vB%Q$!x if(hCallWnd[index]==NULL)
y"hM6JI continue;
W(8g3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
gv,T<A?Z2 {
c,qCZ-.Sg SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
0
mQ3P.9 bProcessed=TRUE;
7L]?)2= }
Pjy?&;GvT }
DG-vTr }
GKS y|z if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
D6]$P%t9 for(int index=0;index<MAX_KEY;index++){
%8tN$8P if(hCallWnd[index]==NULL)
e.+)0)A- continue;
5 QeGx3' if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
oD7H6\_ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
^ZlV1G;/W@ //lParam的意义可看MSDN中WM_KEYDOWN部分
%(Ys-GeGr }
vz:0"y }
:2My|3H\ }
)eEvyU
return CallNextHookEx( hHook, nCode, wParam, lParam );
:6/OU9f/R }
VqrMi *W6 Z)A+ wM 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:
_HK&KY ]aRD6F:L BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
a7|&Tbv BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
"{k
)nr+7U of`]LU: 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:
Ak1) QT$1D[> LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
."X~?Nk {
=Q}mJs if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
t4*A+"~j {
%MJ7u} //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
$te,\$&} SaveBmp();
\i+h P1mz return FALSE;
(3h*sd5ly }
hyKg=Foq …… //其它处理及默认处理
Zsogx}i- }
5Nb_K`Vp* ehusI-q LwPM7S~ * 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
cv4M[]U~ zrO|L|F&P 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
UK>=y_FYO SU'9+=_$ 二、编程步骤
4Jr[8P0/A9 "V0:Lq 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";
7 !.8#A': KL mB 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
-C}59G8 ~k0)+D} 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;
J\ +gd% b6Hk20+B; 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;
Iq]6] Pu*HZW3l 5、 添加代码,编译运行程序。
ls\E%d 6a7iLQA 三、程序代码
}.) 43(>] ?1:/
6 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
SQU%N #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
Z{4aGp* #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
SWsv, #if _MSC_VER > 1000
%`'z^W #pragma once
)x x/di #endif // _MSC_VER > 1000
K=?F3tX^ #ifndef __AFXWIN_H__
]C6[`WF #error include 'stdafx.h' before including this file for PCH
$cK
B+} #endif
} !<cph #include "resource.h" // main symbols
w
a<C*o class CHookApp : public CWinApp
5b`xN!c {
)v{41sM+ public:
z~e~K`S CHookApp();
/_OZ1jX // Overrides
rY?F6'} // ClassWizard generated virtual function overrides
Pd "mb~ //{{AFX_VIRTUAL(CHookApp)
d"6]? public:
-,A5^>}%,Y virtual BOOL InitInstance();
m'(;uR` virtual int ExitInstance();
:2)1vQH0L //}}AFX_VIRTUAL
6a?$=y //{{AFX_MSG(CHookApp)
HL}~W}!j // NOTE - the ClassWizard will add and remove member functions here.
~1r*/@M[V // DO NOT EDIT what you see in these blocks of generated code !
[F)/mN //}}AFX_MSG
?U/Wio$@ DECLARE_MESSAGE_MAP()
XQJ^)d00h };
ObyuhAR LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
d<Q+D1 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
+%qSB9_>N{ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Qy^z *s BOOL InitHotkey();
a!y,!EB+Qu BOOL UnInit();
iQzX-a|4] #endif
;#yu"6{ z2Y_L8u2 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
BZ;}ROmqk #include "stdafx.h"
Mev-M2A #include "hook.h"
)*K<;WIWH #include <windowsx.h>
b({Nf,(a2
#ifdef _DEBUG
;IuK2iDt< #define new DEBUG_NEW
y^QYlZO #undef THIS_FILE
dXcPWbrU4 static char THIS_FILE[] = __FILE__;
r d6F"W #endif
@> Ghfh>~D #define MAX_KEY 100
ZE8/ m") #define CTRLBIT 0x04
{pe7]P? #define ALTBIT 0x02
!jnqA Z #define SHIFTBIT 0x01
('**nP
#pragma data_seg("shareddata")
:DMHezaU HHOOK hHook =NULL;
mbX)'. +L UINT nHookCount =0;
Ku/H= static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
<duBwkiG static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
[|[sYo static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
w38c static int KeyCount =0;
9Z0CF~Y5 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Oh/b?|imG #pragma data_seg()
CaYos;Pl HINSTANCE hins;
c2/R]%`)9 void VerifyWindow();
zyZok*s BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
&V#z kW //{{AFX_MSG_MAP(CHookApp)
YQ@dl // NOTE - the ClassWizard will add and remove mapping macros here.
,%?; \?b%h // DO NOT EDIT what you see in these blocks of generated code!
].-J. //}}AFX_MSG_MAP
=X`]Ct8Z END_MESSAGE_MAP()
DN"S, YBtq0c CHookApp::CHookApp()
f
OM^V{)T {
2E3?0DL", // TODO: add construction code here,
XSp x''l // Place all significant initialization in InitInstance
H-_^TB }
MvZ+n \,l.p_< CHookApp theApp;
hJ;f1dZ7} LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
\[[TlB> {
2q-:p8 BOOL bProcessed=FALSE;
']ITuP8 if(HC_ACTION==nCode)
]g>m? \'n {
&e-#|p#v if((lParam&0xc0000000)==0xc0000000){// Key up
#h gmUa switch(wParam)
'&-5CpDUs {
;]gsJ9FK< case VK_MENU:
}fJ:wku MaskBits&=~ALTBIT;
>@)*Sn9" break;
HPtTv}l case VK_CONTROL:
@],6SKbG6 MaskBits&=~CTRLBIT;
U]V3DDN break;
R3B5-^s case VK_SHIFT:
ZDOF MaskBits&=~SHIFTBIT;
&G-#*OG break;
smfG,TI default: //judge the key and send message
?w]"~ break;
/nC{)s?S' }
4|>
rwQ~t for(int index=0;index<MAX_KEY;index++){
j-lSFTo if(hCallWnd[index]==NULL)
R`@8.]cpPy continue;
s[G|q5n if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,DQGv_ {
oLrkOn/aY SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
aF&r/j+}o bProcessed=TRUE;
MAE7A"la }
{D_++^ }
^&+zA,aL,A }
.cg= else if((lParam&0xc000ffff)==1){ //Key down
pqyWv; switch(wParam)
je&dioZ> {
!,cQ'*<W8- case VK_MENU:
:3KO6/+ MaskBits|=ALTBIT;
IajD;V break;
rc;7W: case VK_CONTROL:
M82.khm~jM MaskBits|=CTRLBIT;
E4sn[DO break;
LP^p~5Az case VK_SHIFT:
T@;! yz}Pf MaskBits|=SHIFTBIT;
\%sPNw=e break;
Km6Ub?/7o default: //judge the key and send message
A",eS6 break;
3R5K}ZBi% }
2y3?!^$ for(int index=0;index<MAX_KEY;index++)
!]$V9F{K {
Uc_jQ4e_ if(hCallWnd[index]==NULL)
K :1g" continue;
D:=t*2-Iv if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
@%6)^]m}r {
kQ@gO[hS SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
v<L=!-b^ bProcessed=TRUE;
}1QI"M* }
VZ\O9lD }
a?5WKO }
{eEBrJJeB if(!bProcessed){
2 dHM for(int index=0;index<MAX_KEY;index++){
B4`2.yRis if(hCallWnd[index]==NULL)
R=!kbBK>\ continue;
r?fH
&u if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
AXz-4,=xX SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
*:a'GC%/ }
Z;ZuS[ZA }
'S =sj}X }
*8z"^7?^= return CallNextHookEx( hHook, nCode, wParam, lParam );
^'m\D; }
{DU"]c/S q_cC7p6t BOOL InitHotkey()
3^{8_^I {
$z*@2Non if(hHook!=NULL){
ARP KzF`Wq nHookCount++;
z)}3**3'y return TRUE;
oFWt(r }
&|)hCJu else
he"L*p*H hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
O/mR9[} if(hHook!=NULL)
e"]"F{Q nHookCount++;
YPu9Q return (hHook!=NULL);
1o8wy_eSs }
lK0s=4c{ BOOL UnInit()
x
Sv-;!y {
b3}Q#Y\G if(nHookCount>1){
X4a^mw\" nHookCount--;
M)L/d_4ka return TRUE;
BWWq4mdb{ }
)D;*DUtMVm BOOL unhooked = UnhookWindowsHookEx(hHook);
)T9;6R$b if(unhooked==TRUE){
bG"HD?A_ nHookCount=0;
#,G1R7 hHook=NULL;
1Q]Rd }
u^Vh.g] return unhooked;
5L F/5` }
n=q=zn; hi!`9k BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
98GlhogWt {
3?Lgtkb8 BOOL bAdded=FALSE;
W;4Lkk$ for(int index=0;index<MAX_KEY;index++){
`ruNA>M if(hCallWnd[index]==0){
^K+:C;Q| hCallWnd[index]=hWnd;
/#f^n]v HotKey[index]=cKey;
>)Ioo$B HotKeyMask[index]=cMask;
o]<jZ_|gB bAdded=TRUE;
{(4# )K2g% KeyCount++;
$_sYfU9 break;
k'Gw!p} }
BWh}^3?l }
uVGa(4u} return bAdded;
r4u z} jl{ }
)>\4ULR83 (ew}
gJ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
8'_ 0g[s {
6gnbkpYi BOOL bRemoved=FALSE;
{6h|6.S2 for(int index=0;index<MAX_KEY;index++){
UP2}q?4 if(hCallWnd[index]==hWnd){
=Q-k'= 6\ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
b._m 8z ~ hCallWnd[index]=NULL;
;FU|7L$H HotKey[index]=0;
3+ =I;nj HotKeyMask[index]=0;
>"%ob,c:# bRemoved=TRUE;
zzJja/mp KeyCount--;
#jBN?Z# break;
rFey4zzz }
!;v.>.lw
}
C`QzT{6! }
=\Iu$2r` return bRemoved;
<*<U!J-i }
EiWd+v,QJQ L2fZ{bgy void VerifyWindow()
*nRNg.i3D {
z\T Lsx for(int i=0;i<MAX_KEY;i++){
)MSZ2)( if(hCallWnd
!=NULL){ =xL )$DTg)
if(!IsWindow(hCallWnd)){ ?'eq",c#4N
hCallWnd=NULL; n*<v]1
HotKey=0; 1oty*c
HotKeyMask=0; T p<s1'"
KeyCount--; OX\$ nQ\o
} ^2S# Uk
} XN#&NT{t}
} M&KyA
} ~}'F887 f
E"qFXA>
BOOL CHookApp::InitInstance() $i#?v
{ (RE2I
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 7O)" `
hins=AfxGetInstanceHandle(); 8AL\ST51x"
InitHotkey(); FJ54S
return CWinApp::InitInstance(); \S4SI
} fPqr6OYz
^:KO_{3E
int CHookApp::ExitInstance() z)-c#F@%
{ I4=Xb^Ux
VerifyWindow(); QA?oJ_}y
UnInit(); p=Y>i 'CG
return CWinApp::ExitInstance(); *jITOR!uF`
} L(G92,.
@MbVWiv
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^zr^ N?a
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) h/)_)
r.x
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ [syj#
#if _MSC_VER > 1000 ^U@~+dw
#pragma once HC*?DJ,
#endif // _MSC_VER > 1000 2eb1lJdS
)8,|-o=
class CCaptureDlg : public CDialog .c+9P<VmC}
{ 5l{Ts04k%
// Construction [
MyE2^
public: r.yK,
BOOL bTray; V
'.a)6
BOOL bRegistered; w0lT%CPx
BOOL RegisterHotkey(); pQa:pX
UCHAR cKey; HrM$NRhu
UCHAR cMask; {tiKH=&J
void DeleteIcon(); >IfV\w32
void AddIcon(); vFv3'b$;G
UINT nCount; Bc5+ss
void SaveBmp(); 6'vbT~S!
CCaptureDlg(CWnd* pParent = NULL); // standard constructor L] %l51U
// Dialog Data F@YKFk+a
//{{AFX_DATA(CCaptureDlg) 4hs)b
enum { IDD = IDD_CAPTURE_DIALOG }; (?0`d
CComboBox m_Key; bHE2,;o
BOOL m_bControl; A8r^)QJP{
BOOL m_bAlt; A7Po 3n%Q
BOOL m_bShift; u<xo/=Z
CString m_Path; o\VUD
CString m_Number; (s<s@`
//}}AFX_DATA >ut" OL9J
// ClassWizard generated virtual function overrides ino:N5&;;
//{{AFX_VIRTUAL(CCaptureDlg) YJeyIYCs<
public: #xh_
virtual BOOL PreTranslateMessage(MSG* pMsg); 2JGL;U$
protected: EgjR^A1W2
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support sD;M!K_
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 3uWkc3
//}}AFX_VIRTUAL 4?\:{1X=
// Implementation Smw QET<H
protected: p4!:]0c
HICON m_hIcon; p'_%aVm7
// Generated message map functions 64>krmVIe
//{{AFX_MSG(CCaptureDlg) Yf@e=:
virtual BOOL OnInitDialog(); S$,'Q^~K
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); u\yVR$pQ
afx_msg void OnPaint(); Fh$slow4!
afx_msg HCURSOR OnQueryDragIcon(); w"Y` ]2
virtual void OnCancel(); n2B){~vE
afx_msg void OnAbout(); dt@P>rel
afx_msg void OnBrowse(); {i0SS
afx_msg void OnChange();
]:M0Kj&h
//}}AFX_MSG MK#wut
DECLARE_MESSAGE_MAP() \y`+B*\i
}; 'k0[rDFc#3
#endif Pz*_)N}j >
DyJ.BQdk)
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file EOj"V'!
#include "stdafx.h" 'xY@ x-o
#include "Capture.h" bNs4 5hDP
#include "CaptureDlg.h" q[q?hQ/b
#include <windowsx.h> B%CTOi
#pragma comment(lib,"hook.lib") sUJ%x#u}Fk
#ifdef _DEBUG Hmt^h(*/2
#define new DEBUG_NEW PXzsj.
#undef THIS_FILE Hb} X-6N
static char THIS_FILE[] = __FILE__; JF&$t}
#endif 9I27TKy
#define IDM_SHELL WM_USER+1 \MC-4Yz
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &Mq~T_S
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4fk8*{Y
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ~c^>54
class CAboutDlg : public CDialog e}/Lk5q!
{
xw^R@H
public: `*", <
CAboutDlg(); x+ncc_2n&D
// Dialog Data tz4
]qOH8
//{{AFX_DATA(CAboutDlg) v\16RD
enum { IDD = IDD_ABOUTBOX }; @AHm!9?o
//}}AFX_DATA IN8>ZV`j)
// ClassWizard generated virtual function overrides voP7"Dl[
//{{AFX_VIRTUAL(CAboutDlg) x3jb%`o#!
protected: * _a@z1
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "k*PA\U
//}}AFX_VIRTUAL (~CLn;'
// Implementation 5pr"d@.
protected: ::Ke^dp
//{{AFX_MSG(CAboutDlg) X[`bMa7IB(
//}}AFX_MSG F<>!kK/c
DECLARE_MESSAGE_MAP() `>0MNmu
}; )[0T16
2
rw%H
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) d\x7Zw>
{ ]f+ csB
//{{AFX_DATA_INIT(CAboutDlg) 8Ac)'2t;U
//}}AFX_DATA_INIT FZ!`B]]le,
} 6"Bic rY
R\o<7g-|
void CAboutDlg::DoDataExchange(CDataExchange* pDX) rSXh;\MfB4
{ u6>?AW1~
CDialog::DoDataExchange(pDX); _ZY)M
//{{AFX_DATA_MAP(CAboutDlg) hxCvk/7sT
//}}AFX_DATA_MAP s!n<}C
} }*.0N;;C
'YNT8w/3
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) DXz}YIEC
//{{AFX_MSG_MAP(CAboutDlg) ;"(foY"L
// No message handlers !x!07`+^u
//}}AFX_MSG_MAP Q+4Xs.#
END_MESSAGE_MAP() G}&Sle]
:'#TCDlOb
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) #fT*]NN
: CDialog(CCaptureDlg::IDD, pParent) 311LC cRp
{ ,%\o4Rc'o
//{{AFX_DATA_INIT(CCaptureDlg) 0a-:<zm
m_bControl = FALSE; oc8:r
m_bAlt = FALSE; T&Lb<'f
m_bShift = FALSE; vAyFm dJ^
m_Path = _T("c:\\"); Yjx|9_|Xn
m_Number = _T("0 picture captured."); {?'fyEeg
nCount=0; yAoe51h?
bRegistered=FALSE; \[Z?&
bTray=FALSE; w@N
//}}AFX_DATA_INIT m0v:\?S:
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 |V<h=D5W
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); )M)7"PC
} v\p;SwI
\Y"Wu
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) -_`>j~
{ }Ho Qwy|&
CDialog::DoDataExchange(pDX); _YF%V;X
//{{AFX_DATA_MAP(CCaptureDlg) rETRTp0HT
DDX_Control(pDX, IDC_KEY, m_Key); H^YSJ6
DDX_Check(pDX, IDC_CONTROL, m_bControl); =i~}84>
DDX_Check(pDX, IDC_ALT, m_bAlt); y@\V+
DDX_Check(pDX, IDC_SHIFT, m_bShift); c%=IL M4
DDX_Text(pDX, IDC_PATH, m_Path); J~#;<e{\"
DDX_Text(pDX, IDC_NUMBER, m_Number); ULQMG'P^D
//}}AFX_DATA_MAP I1PuHf Qs
} xQUu|gtL4
E9~Ghx.
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Nm|!#(L
//{{AFX_MSG_MAP(CCaptureDlg) 1Tu
*79A
ON_WM_SYSCOMMAND() V0)fZS@tf
ON_WM_PAINT() XLH0 ;+CL{
ON_WM_QUERYDRAGICON() D9z|VIw8
ON_BN_CLICKED(ID_ABOUT, OnAbout) 3YVi"
k?2
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ]\!?qsT3}
ON_BN_CLICKED(ID_CHANGE, OnChange) aG^4BpIP
//}}AFX_MSG_MAP mauI42
END_MESSAGE_MAP() vd8{c7g:n
!Y-98<|b
M
BOOL CCaptureDlg::OnInitDialog() eut-U/3: #
{ tg{H9tU;
CDialog::OnInitDialog(); ,T2G~^0
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); s0PrbL%_`
ASSERT(IDM_ABOUTBOX < 0xF000); ]Ux<aiY]a
CMenu* pSysMenu = GetSystemMenu(FALSE); b,CaWg
if (pSysMenu != NULL) @HOBRRm`
{ 2 $Tj84'X
CString strAboutMenu; B>2tZZko
strAboutMenu.LoadString(IDS_ABOUTBOX); >uSy
if (!strAboutMenu.IsEmpty()) p\bDY
{ rb|U;)C
pSysMenu->AppendMenu(MF_SEPARATOR); mya_4I
m
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); l,kUhZ@W
} @;'o2
} ;aw=MV
SetIcon(m_hIcon, TRUE); // Set big icon ,G2TVjz
SetIcon(m_hIcon, FALSE); // Set small icon wu)w
m_Key.SetCurSel(0); ;cQ6g`
bM\
RegisterHotkey(); WVI{oso#
CMenu* pMenu=GetSystemMenu(FALSE); DCZ\6WY1G)
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); %@u;5qD&
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 5F~'gLH/F-
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); gXjV?"^kUl
return TRUE; // return TRUE unless you set the focus to a control
YxP&7oq
}
Y*UA,<-
uXKERzg
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9^j &VmF
{ l6d$V9A
if ((nID & 0xFFF0) == IDM_ABOUTBOX) R=|{n'n$0|
{ m&?#;J|B$
CAboutDlg dlgAbout; 9M:O0) s
dlgAbout.DoModal(); 7R`mf
} Rp5#clsy
else % ClHCoyA
{ 6Aku1h
CDialog::OnSysCommand(nID, lParam); o|$AyS{1
}
~/P&Tub^
} 9<>wIl*T`
`b^Ru+(dM
void CCaptureDlg::OnPaint() 'nwx9]q
{ 9pX&ZjYP-
if (IsIconic()) ,]d,-)KX8
{ 07[_.i.l
CPaintDC dc(this); // device context for painting @w?P7P<O`
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); H XmS|PX
// Center icon in client rectangle =W"F[fD
int cxIcon = GetSystemMetrics(SM_CXICON); PBp^|t]E>
int cyIcon = GetSystemMetrics(SM_CYICON); L>3x9
CRect rect; ROous4 MG
GetClientRect(&rect); ^3UGV*Ypk
int x = (rect.Width() - cxIcon + 1) / 2; sashzVwJ-=
int y = (rect.Height() - cyIcon + 1) / 2; aXoVy&x=
// Draw the icon 6E^.7%3
dc.DrawIcon(x, y, m_hIcon); v+X)Qmzf~
} RR]CW
else WUh$^5W
{ $GTU$4u
CDialog::OnPaint(); LS917ci-
} wf:OK[r9
} hX=A)73(
fIsp;ca[k
HCURSOR CCaptureDlg::OnQueryDragIcon() 4/wa+Y+=vt
{ 9;B0Mq
py
return (HCURSOR) m_hIcon; 6Q${U7%7
} ;oc&Hb
=_:et0
void CCaptureDlg::OnCancel() 6,0_)O}\b
{ ;<(W% _
if(bTray) ; ShJi
DeleteIcon(); Mw;sLsu
CDialog::OnCancel(); RH&~+5
} rv|)n>m
%y@Hh=
void CCaptureDlg::OnAbout() FgB&b
{ c1E'$-
K@
CAboutDlg dlg; 6x%h6<#xh*
dlg.DoModal(); D?NbW @]
} `.i!NBA'6
<y?r!l=Am
void CCaptureDlg::OnBrowse() `0Oh_8"
{ z}MP)|aH:
CString str; /K.!sQ$
BROWSEINFO bi; U
15H2-`
char name[MAX_PATH]; T-U}QM_e
ZeroMemory(&bi,sizeof(BROWSEINFO)); lc~%=
bi.hwndOwner=GetSafeHwnd(); +Zaj,oEE
bi.pszDisplayName=name;
&2{tF
bi.lpszTitle="Select folder"; Ndi9FD3im
bi.ulFlags=BIF_RETURNONLYFSDIRS; >kW@~WDMu
LPITEMIDLIST idl=SHBrowseForFolder(&bi); #?/<
if(idl==NULL) v%iof1 T'
return; |bO"_U
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); d'G0m9u2
str.ReleaseBuffer(); a- |*?{o
m_Path=str; <gQIq{B?
if(str.GetAt(str.GetLength()-1)!='\\') v~@pMA$(h
m_Path+="\\"; gk0( ANx
UpdateData(FALSE); =5(>q5Z*
} K*X_FJ
kNobl
void CCaptureDlg::SaveBmp() 5Hw~2 ?a,
{ .O0+H+
CDC dc;
?B}{GL2)
dc.CreateDC("DISPLAY",NULL,NULL,NULL); !BOY@$Y
CBitmap bm; PqiB\~o@Z
int Width=GetSystemMetrics(SM_CXSCREEN); paD !Z0v&
int Height=GetSystemMetrics(SM_CYSCREEN); E: $P=%b
bm.CreateCompatibleBitmap(&dc,Width,Height); N<IT w/@^
CDC tdc; fvdU`*|n)
tdc.CreateCompatibleDC(&dc); {l/-LZ.
CBitmap*pOld=tdc.SelectObject(&bm); Nw1#M%/!r!
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); U qFv}VsnF
tdc.SelectObject(pOld); aPm`^
q
BITMAP btm; UHTvCc
bm.GetBitmap(&btm); RM!<8fXYD
DWORD size=btm.bmWidthBytes*btm.bmHeight; 9*{[buZX
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); vJ-q*qM1
BITMAPINFOHEADER bih; B#.L
bih.biBitCount=btm.bmBitsPixel; 8q,6}mV
bih.biClrImportant=0; 4 Dw@r{
bih.biClrUsed=0; [&#/]Ul'
bih.biCompression=0;
l%1!a
bih.biHeight=btm.bmHeight; 'gTb A?+@5
bih.biPlanes=1; -\
EP.Vtz
bih.biSize=sizeof(BITMAPINFOHEADER); |~X ;1j!
bih.biSizeImage=size; C'o64+W^
bih.biWidth=btm.bmWidth; WYEKf9}
bih.biXPelsPerMeter=0; iX2]VRNx l
bih.biYPelsPerMeter=0; ~e+\k>^eN
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); j]aoR
static int filecount=0; w[IE
CString name; T`;%TO*Y
name.Format("pict%04d.bmp",filecount++); Z(ACc9k6:'
name=m_Path+name; /7t>TYip!
BITMAPFILEHEADER bfh; o!{w"K
bfh.bfReserved1=bfh.bfReserved2=0; 2M68CE
bfh.bfType=((WORD)('M'<< 8)|'B'); /p+>NZ"b
bfh.bfSize=54+size; Pyb Z)5u
bfh.bfOffBits=54; ,z-}t&
_t
CFile bf; }L# _\
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %Ntcvp)
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); uoX:^'q
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 5`gQ~
bf.WriteHuge(lpData,size); * Of4o
bf.Close(); /iJ4{p
nCount++; (+FfB"3]
} CJJzCVj
GlobalFreePtr(lpData); :QB<?HaS'
if(nCount==1) g'V>_u#(
m_Number.Format("%d picture captured.",nCount); PSZL2iGj9V
else d[V;&U
m_Number.Format("%d pictures captured.",nCount); b{]z
wpf
UpdateData(FALSE); Dm-zMCf}Q
} 7lBAxqr2
lJis~JLd`
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) bS"fkf9
{
sSi6wO$
if(pMsg -> message == WM_KEYDOWN) ),ma_{$N
{ >V*mr{/1
if(pMsg -> wParam == VK_ESCAPE) l33Pm/V2?
return TRUE; 2|}+T6_q
if(pMsg -> wParam == VK_RETURN) glF; eT
return TRUE; V&\[)D'c
} +(1zH-^.
return CDialog::PreTranslateMessage(pMsg); }9W4"e 2)
} fvF?{k> ~}
( 8c9 /7h
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3T!lA
{ 0QOBL'{7)
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ W^]3XJP
SaveBmp(); I|
b2acW
return FALSE; 6Qy@UfB
} T2!6(,
s9
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ dK2p7xo
CMenu pop; 4*cU<
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); :X]itTrGs
CMenu*pMenu=pop.GetSubMenu(0); 6DuEL=C
pMenu->SetDefaultItem(ID_EXITICON); KNLfp1!
CPoint pt; nEkR1^30
GetCursorPos(&pt); G6FEp`
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 9)gC6IiW
if(id==ID_EXITICON) nY`RRC
DeleteIcon(); "G@g" gP
else if(id==ID_EXIT) ktdW`R\+
OnCancel(); FWHNj.r
return FALSE; dRaNzK)M
} YGPy@-,E
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0 SNIYkGE
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) V` 1/SQX
AddIcon(); {'2@(^3
return res; 5_z33,q2
} O2BDL1o
(;57 Vw
void CCaptureDlg::AddIcon() +[tE ^`-F
{ 4@ML3d/
NOTIFYICONDATA data;
S4h:|jLUF
data.cbSize=sizeof(NOTIFYICONDATA); D? 8rO"
CString tip; K?zH35f$
tip.LoadString(IDS_ICONTIP); cvfr)K[0
data.hIcon=GetIcon(0); d~`x )B(
data.hWnd=GetSafeHwnd(); h}cy D7Wn
strcpy(data.szTip,tip); eZdu2.;<
data.uCallbackMessage=IDM_SHELL; ,;Hu=;
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; \&i P`v`K
data.uID=98; Ffv`kn@
Shell_NotifyIcon(NIM_ADD,&data);
X~<("
ShowWindow(SW_HIDE); 3MY(<TGX
bTray=TRUE; nx^]>w
} =UJ:t Sr
z3K6%rb-
void CCaptureDlg::DeleteIcon() r.>].~}4
{ '=G|Sq^aO
NOTIFYICONDATA data; L.1_(3NG
data.cbSize=sizeof(NOTIFYICONDATA); ]jaQ[g$F
data.hWnd=GetSafeHwnd(); V8HnUuz
data.uID=98; B,@c;K
Shell_NotifyIcon(NIM_DELETE,&data); \7l-@6'7
ShowWindow(SW_SHOW); }`v~I4i
SetForegroundWindow(); 3`ELKq
ShowWindow(SW_SHOWNORMAL); }c`fW&
bTray=FALSE; O Vko+X`
} r]l!WRn
UF<uU-C"
void CCaptureDlg::OnChange() R&Jm
+3N
{ nZ@&2YPlem
RegisterHotkey(); 8&3V#sn'
} u
a~CEs
5KDGSo
BOOL CCaptureDlg::RegisterHotkey() QzzW x2
{ {FIXc^m'
UpdateData(); %QKRFPYhS
UCHAR mask=0; a(9L,v#?
UCHAR key=0; _',prZ*
if(m_bControl) nM-h&na{s
mask|=4; 3&[>u;Bp
if(m_bAlt) DiEluA&w9
mask|=2; c=L2%XPP
if(m_bShift) 5K<5kHpvJ{
mask|=1;
2;^y4ssg
key=Key_Table[m_Key.GetCurSel()]; Nv/v$Z{k
if(bRegistered){ 0LfU=X0#7
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 0em#-*|2"
bRegistered=FALSE; lm xr oHE
} g|<]B$yN#
cMask=mask; yfx7{naKC`
cKey=key; 9f',7i
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); @W^| ?
return bRegistered; P '>SmQ
} <0QH<4
)~+ e`q
四、小结 rfgI$eu
Qum9A
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。