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:
TS=U%)Ik
\i<7Lk 一、实现方法
E#!.;AQ \vS >jB 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:
2|NQ5OA0 K=pG,[ChA #pragma data_seg("shareddata")
]a[2QQ+g HHOOK hHook =NULL; //钩子句柄
Ua~8DdW UINT nHookCount =0; //挂接的程序数目
9eR";Wm]) static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
g?cxqC< static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
k3]qpWKj static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
)d|s$l$?7 static int KeyCount =0;
kX)*:~* static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
8~BLTZ #pragma data_seg()
!:}m-iqQ1 IfY?P(P 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。
0}'/3Q Zt9ld=T 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:
4i<GqG xP27j_*m> BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
!HeQMz cKey,UCHAR cMask)
SEE:v+3| {
i8%@4U/ J BOOL bAdded=FALSE;
u('`.dwkc for(int index=0;index<MAX_KEY;index++){
|C0!mU if(hCallWnd[index]==0){
X}ihYM3y/ hCallWnd[index]=hWnd;
*Y!RU{w+Z HotKey[index]=cKey;
@CoUFdbz HotKeyMask[index]=cMask;
{CFy
% bAdded=TRUE;
X0]$Ovq( l KeyCount++;
1{1mL-I; break;
*_H]?& }
!\'HKk~V }
Tl+PRR6D* return bAdded;
%MCS_'N
J }
vN~joQ=d //删除热键
43~v1pf{! BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
AOz~@i^ {
V6k Dyl( BOOL bRemoved=FALSE;
J*AYZS-tSE for(int index=0;index<MAX_KEY;index++){
kxmsrQ>av if(hCallWnd[index]==hWnd){
8Au W>7_ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
h${=gSJc hCallWnd[index]=NULL;
g[\8s~g, HotKey[index]=0;
}FX:sa?5 HotKeyMask[index]=0;
1@F>E;YjL= bRemoved=TRUE;
,vBB". LY' KeyCount--;
VJ1rU mO~ break;
WmRu3O }
l% qh^0 }
o> &-B.zq }
5v sn'=yN return bRemoved;
Cm0K-~
U }
6y"T;.FAo m\_v{1g ME.!l6lm\ DLL中的钩子函数如下:
g!z &lQnZ E
0@u| LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
E
`V?Io {
*Xn6yL9 BOOL bProcessed=FALSE;
$y UPua/- if(HC_ACTION==nCode)
O:8Ne*L`D {
1bjWWNzQA if((lParam&0xc0000000)==0xc0000000){// 有键松开
):n'B` f}z switch(wParam)
#IJ6pg>K {
L D%SLJ: case VK_MENU:
.\3gb6S} MaskBits&=~ALTBIT;
~3|)[R=+p1 break;
6LqF*$+$` case VK_CONTROL:
:W+%jn MaskBits&=~CTRLBIT;
JM53sx4& break;
Kp!A
ay case VK_SHIFT:
D}N4*L1 MaskBits&=~SHIFTBIT;
j9BcoEl:; break;
j@4]0o default: //judge the key and send message
Sae*VvT6 break;
j{/5i`5m }
<X?xr f for(int index=0;index<MAX_KEY;index++){
<<-BQ
l~ if(hCallWnd[index]==NULL)
n-1 continue;
y!|4]/G]?t if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
t7*F, {
g'EPdE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
.Y }k@T40a bProcessed=TRUE;
F3x*dq2 }
*9`k$' }
uX6rCokr }
-oY8]HrXfK else if((lParam&0xc000ffff)==1){ //有键按下
kZfj"+p_S switch(wParam)
V5 Gy|X {
a;&0u> case VK_MENU:
+KOhDtLMG MaskBits|=ALTBIT;
3.rl^Cq1 break;
g3Ul'QJ case VK_CONTROL:
%2^V.`0T MaskBits|=CTRLBIT;
{yMkd4v break;
Z}3;Ych case VK_SHIFT:
V=Z%y$1Bc MaskBits|=SHIFTBIT;
ly@%1 break;
Z`n "}{ default: //judge the key and send message
ojVN-*5
break;
>}d6)s| }
Vq^b_^ for(int index=0;index<MAX_KEY;index++){
vF'IK, if(hCallWnd[index]==NULL)
%Siw> continue;
V3/OKI\o if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\\Z?v,XsS {
V h5\'Sn SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
4% 6@MQ[ bProcessed=TRUE;
dE3M }
.fK~IKA }
#.LI`nYA }
drp< f1`l8 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
p.,`3"C1 for(int index=0;index<MAX_KEY;index++){
~b[5}_L=> if(hCallWnd[index]==NULL)
MI`<U:-lP continue;
H8E#r*"-m if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
m5W':vM SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
WGUd@lC~ //lParam的意义可看MSDN中WM_KEYDOWN部分
wid }
}G"bD8+ }
R,-DP/ (im }
cxIAI=JK return CallNextHookEx( hHook, nCode, wParam, lParam );
"a<:fEsSE }
[9yy<Z5 M0]J`fL@ 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:
CH6;jo] w4RtIDW: BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
(62Sc] BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
.RbPO#( 1WI^RlWd( 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:
r6nWrO>y C`8.8 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
$wk(4W8E {
)
gxN'z if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
!z5Ozm+} {
B!J&=*=e //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Jn20^YG SaveBmp();
/^`do3a} return FALSE;
P+rDln{ }
4v`;D,dIu …… //其它处理及默认处理
WKq{g+a }
gi8f)MNP?~ :T#f&|Gg; Qn@[{%),4 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。
d;).| .}P qh6Q#s>tH 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。
"[CR5q9Pr Ubh)}G,Mg 二、编程步骤
\CYKj_c xBE}/F$45 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
L(HAAqRnJ '.7ER 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
,fhK f~f)6XU| 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
]'0}fuV w%%*3[--X 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
u_Xp\RJ zTw<9 Nf 5、 添加代码,编译运行程序。
h<g2aL21?F "?'9\<> 三、程序代码
f/sLQdK, +rka5ts ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
(b7',:_U7 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
a@C}0IP) #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
v
`;Hd8 #if _MSC_VER > 1000
Dp?lgw #pragma once
R'^J#"[ #endif // _MSC_VER > 1000
</2Cn@ #ifndef __AFXWIN_H__
:bqUA(k #error include 'stdafx.h' before including this file for PCH
4UMOC_ #endif
XM`&/) #include "resource.h" // main symbols
l(8@?t^; class CHookApp : public CWinApp
{3``B#} {
K#R|GEwr public:
}|],UXk{xB CHookApp();
FMT_X // Overrides
{v2[x W // ClassWizard generated virtual function overrides
Z5@E|O & //{{AFX_VIRTUAL(CHookApp)
Q3[nS(#Z/= public:
B_"PFWwg virtual BOOL InitInstance();
RAA,%rRhu( virtual int ExitInstance();
lr)9 U7 //}}AFX_VIRTUAL
|W5lhx0U //{{AFX_MSG(CHookApp)
x.'Ys1M // NOTE - the ClassWizard will add and remove member functions here.
5a:YzQ4 // DO NOT EDIT what you see in these blocks of generated code !
O]t)`+%q //}}AFX_MSG
-=qHwcId DECLARE_MESSAGE_MAP()
}-p-( };
LRSt >;
M LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
N({-&A.N BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
/mK]O7O7 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
{]O.?Yru? BOOL InitHotkey();
fjm3X$tR BOOL UnInit();
8o466m6/ #endif
[=>[ 2Ty r>t|.=! //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
;33SUgX #include "stdafx.h"
I:YE6${k! #include "hook.h"
S~^]ib0 #include <windowsx.h>
SfPtG #ifdef _DEBUG
wif1|!aL #define new DEBUG_NEW
H:mcex #undef THIS_FILE
5qkyi]/U8 static char THIS_FILE[] = __FILE__;
y)3OQ24 #endif
,W>-MPJn[8 #define MAX_KEY 100
$I9U.~* #define CTRLBIT 0x04
xN6}4JB #define ALTBIT 0x02
4Td)1~zc3 #define SHIFTBIT 0x01
~31-)*tJ] #pragma data_seg("shareddata")
/`7G 7pQ+ HHOOK hHook =NULL;
G#6O'G
N UINT nHookCount =0;
X&A2:A 6\+ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
j+2-Xy' static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
&0OH:P% static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
a,e;(/#\7 static int KeyCount =0;
hfs QAa static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
/1.gv~`+ #pragma data_seg()
^CB@4$! HINSTANCE hins;
7Kti&T void VerifyWindow();
x6Q_+!mnk BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
!ozHS_ //{{AFX_MSG_MAP(CHookApp)
0&c<1; // NOTE - the ClassWizard will add and remove mapping macros here.
$LtCI // DO NOT EDIT what you see in these blocks of generated code!
rWJKK //}}AFX_MSG_MAP
iGNZC{ END_MESSAGE_MAP()
I<S*"[nV 8*eVP*g CHookApp::CHookApp()
'i 8`LPQ {
_SQ]\Z // TODO: add construction code here,
pK)!o // Place all significant initialization in InitInstance
S~GS:E# }
;s5JYR _w7yfZLv+ CHookApp theApp;
N'?#g`*KW LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
i$H9~tPs {
`(~oZbErM BOOL bProcessed=FALSE;
S*H
@`Do%d if(HC_ACTION==nCode)
3*eS<n[uG {
>vNE3S_ if((lParam&0xc0000000)==0xc0000000){// Key up
ty8E;[' switch(wParam)
2=X.$&a {
ilQt`-O! case VK_MENU:
e)|5P MaskBits&=~ALTBIT;
HcHwvf6y break;
VRUA<x case VK_CONTROL:
D`)K3;h MaskBits&=~CTRLBIT;
Oo9' break;
,6x>gcR case VK_SHIFT:
2QKt.a MaskBits&=~SHIFTBIT;
{G{>Qa| break;
v R!
y# default: //judge the key and send message
KuMH,rXF break;
|^gnT`+ }
iO}KERfU for(int index=0;index<MAX_KEY;index++){
I\|.WrMNi if(hCallWnd[index]==NULL)
mH )i continue;
Zl?9ibm;@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Uf~5Fc1d = {
18>v\Hi< SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
2 e&M/{ bProcessed=TRUE;
JG{`tTu }
BVS
SO's }
fRp(&%8E }
Rp6q) else if((lParam&0xc000ffff)==1){ //Key down
2j$~lI switch(wParam)
2h1P!4W85 {
5X:3'* case VK_MENU:
4TSkm`iR MaskBits|=ALTBIT;
TpxAp',#7 break;
1tl qw case VK_CONTROL:
?3<Y/Vg%c MaskBits|=CTRLBIT;
</W"e!?X break;
40 zO4 case VK_SHIFT:
ts
r{-4V MaskBits|=SHIFTBIT;
Wlp`D break;
xsU3c0wbr8 default: //judge the key and send message
~w}=Oby'y break;
CW+gZ! }
$dug"[ for(int index=0;index<MAX_KEY;index++)
chM-YuN| {
:N' if(hCallWnd[index]==NULL)
9fsc>9 continue;
!p_l(@f if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
n%!50E6*: {
=>7czw:S1 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
X7?j90tH bProcessed=TRUE;
k7M{+X6[ }
>L$9fn/J }
#z}0]GJKj }
kH=qJ3Z if(!bProcessed){
[~?6jnp for(int index=0;index<MAX_KEY;index++){
jH<,dG:{ if(hCallWnd[index]==NULL)
rY)m"'puP continue;
m;PTO$-- if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
5Hs!s+ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
v+CW([zAx# }
&?k`rF9 }
-o57"r^x }
wd1>L) T return CallNextHookEx( hHook, nCode, wParam, lParam );
nWUau:% }
\!k\%j9 4thPR}DH} BOOL InitHotkey()
tR_DN {
!k#N]
9D3 if(hHook!=NULL){
<f0yh"?6VH nHookCount++;
,,-j5Y return TRUE;
E cd~H+ }
A$?o3--#]G else
zoj
w^%W hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
'Y/8gD~. if(hHook!=NULL)
~}Z{hs) nHookCount++;
H-8_&E?6m return (hHook!=NULL);
'@"A{mrE }
8_3WCbe/ BOOL UnInit()
Hq,znRz~` {
}RQ'aeVl( if(nHookCount>1){
0- u,AD nHookCount--;
jjg&C9w T return TRUE;
.iST!nh }
zhU^~4F BOOL unhooked = UnhookWindowsHookEx(hHook);
XOEf," if(unhooked==TRUE){
O\ w-hk nHookCount=0;
ictOCF hHook=NULL;
cN)noGkp }
8,:lw3x1 return unhooked;
&pAmFe }
)(yKm/50 Q|Nw @7$` BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
b+$-f:mj {
YwJ<0;:+hS BOOL bAdded=FALSE;
+^a@U^V for(int index=0;index<MAX_KEY;index++){
^k!u if(hCallWnd[index]==0){
o|V=3y
Ok hCallWnd[index]=hWnd;
:Y)G- :S+ HotKey[index]=cKey;
lsVg'k/Z! HotKeyMask[index]=cMask;
mm N$\2 bAdded=TRUE;
O! w&3 p KeyCount++;
[8[`V)b break;
p0HcuB)Y }
;5}"2hU> }
;AT~?o`n return bAdded;
mMad1qCi7 }
S?Uvt? XMpE|M!c BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
@T{I;8S {
B|rf[EI> BOOL bRemoved=FALSE;
9bD ER for(int index=0;index<MAX_KEY;index++){
N'8}5Kx5 if(hCallWnd[index]==hWnd){
Y IVN;:B. if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
=7zvp,B hCallWnd[index]=NULL;
_i0,?U2C HotKey[index]=0;
z4(Q.0x7 HotKeyMask[index]=0;
Yk5Cyq bRemoved=TRUE;
-[7S. KeyCount--;
@34CaZ$k break;
M\=/i\- }
S&~;l/ }
y?V#LW[^E }
wU5= ' return bRemoved;
2tdr1+U?g }
}_cX" s efm#:>H void VerifyWindow()
.4,l0Nn`W {
vv`,H~M6 for(int i=0;i<MAX_KEY;i++){
*iujJi if(hCallWnd
!=NULL){ 9'h4QF+Y
if(!IsWindow(hCallWnd)){ oz\r0:
hCallWnd=NULL; .KE2sodq
HotKey=0; gz`P~7-w:
HotKeyMask=0; )cxML<j'
KeyCount--; mV'^4by
} {@3p^b*E)1
} 7f
q\
H{
} +FtL_7[v
} Xq.GvZS`
;O *o
BOOL CHookApp::InitInstance() -'::$
{
{ t+O7dZt%r
AFX_MANAGE_STATE(AfxGetStaticModuleState()); T~-PT39E
hins=AfxGetInstanceHandle(); #6qLu
InitHotkey(); kG]FB.@bG
return CWinApp::InitInstance(); /mFa*~dj2
} 4Awl
p+|(lrYC
int CHookApp::ExitInstance() t[?O*>
{ FR 1se
VerifyWindow(); }TAHVcX*p
UnInit(); he1W22
return CWinApp::ExitInstance(); h**mAa0fo
} "r.eN_d
RF.8zea{O`
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file tz"zQC$
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Xu#K<#V
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !JVpR]lWS
#if _MSC_VER > 1000 <MoKTP-<
#pragma once 0`l(c
#endif // _MSC_VER > 1000 z2.Z xL"*
5qx$=6PT
class CCaptureDlg : public CDialog NKS-G2Y<P
{ U `<?~Bz
// Construction !aub@wH3
public: k->cqtG
BOOL bTray; A/{0J\pA
BOOL bRegistered; e4?p(F-x(
BOOL RegisterHotkey(); |qTS{qQh{L
UCHAR cKey; Rt10:9Kz$
UCHAR cMask; -R-|[xN
void DeleteIcon(); 8rA?X*|S!
void AddIcon(); 6t(I.>-
UINT nCount; 0"to]=
void SaveBmp(); |=9=a@l]P
CCaptureDlg(CWnd* pParent = NULL); // standard constructor -v7O*xm"
// Dialog Data SH${ \BKup
//{{AFX_DATA(CCaptureDlg) ~}fQ.F*7R
enum { IDD = IDD_CAPTURE_DIALOG }; !K$qh{n
CComboBox m_Key; '
;PHuMY#X
BOOL m_bControl; Lu@'Ee!>G
BOOL m_bAlt; QirS=H+~
BOOL m_bShift; ^E3 i]Oem
CString m_Path; +P?^Yx0d
CString m_Number; >^fkHbgNQ
//}}AFX_DATA j >wT-s
// ClassWizard generated virtual function overrides pNzSy"Y$
//{{AFX_VIRTUAL(CCaptureDlg) L)Iv]u
public: Y$SwQ;wl
virtual BOOL PreTranslateMessage(MSG* pMsg); .}.63T$h9
protected: m|5yET
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support T8ftBIOi
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); }.j09[<
//}}AFX_VIRTUAL _PR><L_
// Implementation 09psqXU@I
protected: 7u9!:}Tu
HICON m_hIcon; j>70AE3[8
// Generated message map functions dLs40 -R
//{{AFX_MSG(CCaptureDlg) CI };$4W~
virtual BOOL OnInitDialog(); J^R#
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 5#SD$^
afx_msg void OnPaint(); c5t],P
afx_msg HCURSOR OnQueryDragIcon(); s}pn5zMp:8
virtual void OnCancel(); 6fOh *
afx_msg void OnAbout(); )K0BH q7r
afx_msg void OnBrowse(); UvtSNP&/2d
afx_msg void OnChange(); rz@;Zn
//}}AFX_MSG [e:mRMi
DECLARE_MESSAGE_MAP() `f9I#B
}; zu~E}
#endif x3JX}yCX
y~cDWD<h
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file vZQ'
#include "stdafx.h" h* to%N
#include "Capture.h" ~HH#aXh*
#include "CaptureDlg.h" ;be2sTo
#include <windowsx.h> wlM"Zt
#pragma comment(lib,"hook.lib") QQ5G?E
#ifdef _DEBUG JY|f zL
#define new DEBUG_NEW CqRG !J
#undef THIS_FILE ,c%>M^d
static char THIS_FILE[] = __FILE__; BihXYux*
#endif BmRk|b
#define IDM_SHELL WM_USER+1 )@
/!B`
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); XkWO -L
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); uH}cvshv
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; )rTV}Hk
class CAboutDlg : public CDialog c:/H}2/C
{ 8}&O7zO?
public: b|cUKsL5
CAboutDlg(); (qDu|S3P
// Dialog Data .."=
//{{AFX_DATA(CAboutDlg) F0O/SI(cA
enum { IDD = IDD_ABOUTBOX }; tntQO!pM
//}}AFX_DATA yX}riXe
// ClassWizard generated virtual function overrides 36<PI'l#~
//{{AFX_VIRTUAL(CAboutDlg) !z
!R)6
protected: 0$ -N
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *20$u% z2
//}}AFX_VIRTUAL Xgge_`T9
// Implementation 'nOc_b0
protected: .kl _F7
//{{AFX_MSG(CAboutDlg) >i> %@
//}}AFX_MSG Ut;,Z
DECLARE_MESSAGE_MAP() )F\tU
}; NArql
?h;Zdv>`xz
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) t,mD{ENm&
{ fh0a "#L{
//{{AFX_DATA_INIT(CAboutDlg) ZgN )sVJ
//}}AFX_DATA_INIT U*.Wx0QM
} zFy0SzF
o1j_5c
PS
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #S57SD
{ V^a]@GK:
CDialog::DoDataExchange(pDX); W0]W[b,:u$
//{{AFX_DATA_MAP(CAboutDlg) 35dbDgVz$
//}}AFX_DATA_MAP oT5N_\
} ^f:oKKaAW;
Voi`OCut
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) R5i v]8X4W
//{{AFX_MSG_MAP(CAboutDlg) UZ8
vZ
// No message handlers %#!pAUP\&
//}}AFX_MSG_MAP `Zn2Vx
END_MESSAGE_MAP() RcQo1
ZeVb< g
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) wYxnKm~f
: CDialog(CCaptureDlg::IDD, pParent) h,:8TMJRRN
{ wB(A['k
//{{AFX_DATA_INIT(CCaptureDlg) >Ux5UD
m_bControl = FALSE; $O}:*.{(W
m_bAlt = FALSE; W0vdU;?%
m_bShift = FALSE; eGZ{%\PH<
m_Path = _T("c:\\"); u`Ew^-">
m_Number = _T("0 picture captured."); p&Usl.
nCount=0; <S*o}:iB
bRegistered=FALSE; iqCZIahf
bTray=FALSE; obUX7N
//}}AFX_DATA_INIT 3*13XQ
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 wYTF:Ou^5~
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); p=T,JAI t
} _x<CTFTL
/ESmQc:DWB
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) tvH{[e$
{ &yFt@g]
CDialog::DoDataExchange(pDX); Iu`B7UOF
//{{AFX_DATA_MAP(CCaptureDlg) !C&!Wj
DDX_Control(pDX, IDC_KEY, m_Key); /aa'ryl_%
DDX_Check(pDX, IDC_CONTROL, m_bControl); L&td4`2y
DDX_Check(pDX, IDC_ALT, m_bAlt); R8
1z|+c|_
DDX_Check(pDX, IDC_SHIFT, m_bShift); n
GE3O#fv
DDX_Text(pDX, IDC_PATH, m_Path); ZU%7m_ zO
DDX_Text(pDX, IDC_NUMBER, m_Number); $i@~$m7d-
//}}AFX_DATA_MAP <<>?`7N
} 9;3f`DK@2k
[eV!ho*r
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) .VF4?~+M-
//{{AFX_MSG_MAP(CCaptureDlg) Rg! [ic !
ON_WM_SYSCOMMAND() ]kC/b^~+m
ON_WM_PAINT() yw'b^D/
ON_WM_QUERYDRAGICON() YnZV.&4{
ON_BN_CLICKED(ID_ABOUT, OnAbout) R3;GMe@D#
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) =
E'\
ON_BN_CLICKED(ID_CHANGE, OnChange) Bor _Kib
//}}AFX_MSG_MAP "7_6iB&@<
END_MESSAGE_MAP() { Z<4
]wLHe2bEu
BOOL CCaptureDlg::OnInitDialog() Yrp
WGK520
{ w]w>yD>$
CDialog::OnInitDialog(); =8`,,=P^
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ^`
N+mlh
ASSERT(IDM_ABOUTBOX < 0xF000); 9kj71Jp&}
CMenu* pSysMenu = GetSystemMenu(FALSE); ;c"T#CH.
if (pSysMenu != NULL) o$I% 1
{ aML?$_6
CString strAboutMenu; ajF-T=5
strAboutMenu.LoadString(IDS_ABOUTBOX); il=y m
if (!strAboutMenu.IsEmpty()) X&sXss<fO%
{ @]u nqCO
pSysMenu->AppendMenu(MF_SEPARATOR); hR"j[
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Jvt| q5
} Q/ rOIHiI
} H)S&sx#q]
SetIcon(m_hIcon, TRUE); // Set big icon Y9fktg.
SetIcon(m_hIcon, FALSE); // Set small icon 0,*clvH\;
m_Key.SetCurSel(0); ]fz0E:x
RegisterHotkey(); Vrl)[st!;I
CMenu* pMenu=GetSystemMenu(FALSE); fNOsB^Y
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Z_{`$nW
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); +grIw#j
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); iL f:an*vH
return TRUE; // return TRUE unless you set the focus to a control '3B`4W,
} &!uw;|%
x]|8
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ZGrjb22M
{ ^LgaMmz
if ((nID & 0xFFF0) == IDM_ABOUTBOX) g#0h{%3A
\
{ VF1)dd
CAboutDlg dlgAbout; N=hr%{}c
dlgAbout.DoModal(); %/!n]g-
} Q*|O9vu'D
else (CKx
s
I@
{ $!P(Q
CDialog::OnSysCommand(nID, lParam); 9 ![oJ3
} gAt[kW< n
} O<nJbsl_w
MJ^NRT0?b
void CCaptureDlg::OnPaint() $P#Cf&R
{ idiJ|2T"G
if (IsIconic()) -'&4No
{ vaQZ1a,
CPaintDC dc(this); // device context for painting n|`L>@aw,
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); @@$=MSN
// Center icon in client rectangle JJJlgr]#
int cxIcon = GetSystemMetrics(SM_CXICON); ]eA<
int cyIcon = GetSystemMetrics(SM_CYICON); NQS@i'W=g
CRect rect; seWYY $$
GetClientRect(&rect); Am3^3>
int x = (rect.Width() - cxIcon + 1) / 2; DArEIt6Q
int y = (rect.Height() - cyIcon + 1) / 2; |0:&dw?*!
// Draw the icon Sqj'2<~W
dc.DrawIcon(x, y, m_hIcon); pjr,X+6o
} "-JJ6Bk
else zA[6rYXY
{ ]Cy1yAv={
CDialog::OnPaint(); #iD5&
klo\
} F*QZVg+<*X
} "orZje9AC
{'dpRq{c|
HCURSOR CCaptureDlg::OnQueryDragIcon() !FOPFPn
{ 9Mo(3M
return (HCURSOR) m_hIcon; lO},fM2j
} %v=z|d5-3
Th,15H
DA
void CCaptureDlg::OnCancel() U085qKyCw
{ )qs>Z?7
if(bTray) h,B ]5Of
DeleteIcon(); lVY`^pw?
CDialog::OnCancel(); YGrmco?G
} B:qH7`s
clK3kBh~&
void CCaptureDlg::OnAbout() ,^,KWi9
{ prE~GO7Z
CAboutDlg dlg; X8l[B{|
dlg.DoModal(); s6SG%Vd
} }R5>ja0
$h1`-=\7
void CCaptureDlg::OnBrowse() F
VW&&ft
{ 7eb^^a?
CString str; HN,E+dQ
BROWSEINFO bi; b['Jr% "O
char name[MAX_PATH]; JmB7tRM8
ZeroMemory(&bi,sizeof(BROWSEINFO)); O o9 ePw7
bi.hwndOwner=GetSafeHwnd(); i)fAm$8#G
bi.pszDisplayName=name; 5Z{i't0CQ
bi.lpszTitle="Select folder"; KK"uSC
bi.ulFlags=BIF_RETURNONLYFSDIRS; |x*~PXb
LPITEMIDLIST idl=SHBrowseForFolder(&bi); SS OF\
if(idl==NULL) ''P.~~ezr5
return; (xw) pR
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); FbB^$ ]*
str.ReleaseBuffer(); [#S[=%
m_Path=str; EhDKh\OY5
if(str.GetAt(str.GetLength()-1)!='\\') _j t>%v4}4
m_Path+="\\"; M]&F1<
UpdateData(FALSE); rvjPm5[t
} ^g/
{xb8H
void CCaptureDlg::SaveBmp() M:V'vme)+
{ @R%n &
CDC dc; 2(V;OWY(@
dc.CreateDC("DISPLAY",NULL,NULL,NULL); !}7FC>Cx
CBitmap bm; tA'O66.
int Width=GetSystemMetrics(SM_CXSCREEN); 5tUp[/]pl
int Height=GetSystemMetrics(SM_CYSCREEN); #&zNYzI
bm.CreateCompatibleBitmap(&dc,Width,Height); !K:
CDC tdc; O ;,BzA-n
tdc.CreateCompatibleDC(&dc); K(P24Z\#
CBitmap*pOld=tdc.SelectObject(&bm); le1
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); LbX>@2(&
tdc.SelectObject(pOld); e7X#C)
BITMAP btm;
hUy"XXpr
bm.GetBitmap(&btm); B3 f Kb#T
DWORD size=btm.bmWidthBytes*btm.bmHeight; bHx09F]
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size);
~Dvxe
BITMAPINFOHEADER bih; qRk&b F/
bih.biBitCount=btm.bmBitsPixel; .}'49=c
bih.biClrImportant=0; 1b*Me'
bih.biClrUsed=0; dO/iL7K&
bih.biCompression=0; z8v] Kt &
bih.biHeight=btm.bmHeight; ^2C)Wk$
bih.biPlanes=1; 5[<"_
bih.biSize=sizeof(BITMAPINFOHEADER); Mrpz (})
bih.biSizeImage=size; \@IEqm6
bih.biWidth=btm.bmWidth; iZsZSW \
bih.biXPelsPerMeter=0; (`C#Tq
bih.biYPelsPerMeter=0; G i1Jl"
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Cq mtO?vne
static int filecount=0; 2>%|PQ
CString name; 1Pya\To,m
name.Format("pict%04d.bmp",filecount++); (9g L
name=m_Path+name; RsTz3]`yv
BITMAPFILEHEADER bfh; xi5G?r
bfh.bfReserved1=bfh.bfReserved2=0; @E Srj[
bfh.bfType=((WORD)('M'<< 8)|'B'); er<yB#/;-
bfh.bfSize=54+size; \YXzq<7
bfh.bfOffBits=54; m/
D ~D~
CFile bf; wm1`<r^M.
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1!N|a< #
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); M8_f{|!&
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }STTDq4
bf.WriteHuge(lpData,size); &6ymGo
bf.Close(); dJvT2s.t[
nCount++; rlUo#
} rV6&: \
GlobalFreePtr(lpData); ^,-2";2Xh
if(nCount==1) D\13fjjHlu
m_Number.Format("%d picture captured.",nCount); (^_j,4
else %5g(|Y]
m_Number.Format("%d pictures captured.",nCount); R1sWhB99
UpdateData(FALSE); !TNp|U!
} E; `@S
_E\Cm
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) P8&BtA
{ K_SURTys
if(pMsg -> message == WM_KEYDOWN) +8xC%eE
{ %P8*Az&]T
if(pMsg -> wParam == VK_ESCAPE) RpmOg
return TRUE; RIm8PV;N
if(pMsg -> wParam == VK_RETURN) }}?,({T|n
return TRUE; 19h@fA[:
} +,g3Xqs}X
return CDialog::PreTranslateMessage(pMsg); S4ys)!V1V
} MpNgp)%>
)44c[Z
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) m%ec=%L9
{ pie8 3Wy>
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ f(Su
SaveBmp(); !VDNqW
return FALSE; Svicw`uX0
} 3<
'bi}{
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <u_vL
WS
CMenu pop; 6 l,8ev
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); drwD3jx0xv
CMenu*pMenu=pop.GetSubMenu(0); Of}dsav
pMenu->SetDefaultItem(ID_EXITICON); /R(]hmW
CPoint pt; 1IPRI<1U
GetCursorPos(&pt); UdOO+Z_K%
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); H`bS::JI-
if(id==ID_EXITICON) w}qLI4
DeleteIcon(); 14pyHMOR
else if(id==ID_EXIT) p![UO I"W
OnCancel(); B&+)s5hh
return FALSE; 7 1+
bn
} }' p"q)
LRESULT res= CDialog::WindowProc(message, wParam, lParam); : Tcvj5
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) LrH"d
AddIcon(); JHXtKgFX
return res; ^)p+)5l
} *x-@}WY$U
&_$0lIDQ
void CCaptureDlg::AddIcon() at+Nd K
{ 3y%,f|ju
NOTIFYICONDATA data; Kw7uUJR
data.cbSize=sizeof(NOTIFYICONDATA); AM0CIRX$
CString tip; ()Q#@?c~
tip.LoadString(IDS_ICONTIP); tc0(G~.N
data.hIcon=GetIcon(0); 9e*o$)j_
data.hWnd=GetSafeHwnd(); /!'Png0!
strcpy(data.szTip,tip); YTD&swk
data.uCallbackMessage=IDM_SHELL; z"c,TlVN3
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; b]4\$ rW7
data.uID=98; @u@,Edh
Shell_NotifyIcon(NIM_ADD,&data); <{T5}"e
ShowWindow(SW_HIDE); Vq599M:)V
bTray=TRUE; xOx=Z\ c
} USg,=YM
qjsEyro$-
void CCaptureDlg::DeleteIcon() t"Bp#
U1
{ H0f] Swh0a
NOTIFYICONDATA data; 6j Rewj
data.cbSize=sizeof(NOTIFYICONDATA); !CdF,pd/)m
data.hWnd=GetSafeHwnd(); pr[V*C/
data.uID=98; ]$BC f4:
Shell_NotifyIcon(NIM_DELETE,&data); ;$67GK
ShowWindow(SW_SHOW); X%$1%)C9
SetForegroundWindow(); Q?bCQZ{-Lh
ShowWindow(SW_SHOWNORMAL); j 8)*'T
bTray=FALSE; `MHixQ;j
} I7\T :Q[
+Ks 3
void CCaptureDlg::OnChange() "A*;V
{ 0RjFa;j
RegisterHotkey(); /:v}Ni"6nF
} h$#PboLd
r PTfwhs
BOOL CCaptureDlg::RegisterHotkey() J|F!$m{
{ h1)ny1;
UpdateData(); 9^&B.6! 6
UCHAR mask=0; 'h@&rr@5
UCHAR key=0; J/QqwoR
if(m_bControl) 1gnLKf c
mask|=4; B@@tKn_CQ
if(m_bAlt) C[';B)a
mask|=2; )W6l/
if(m_bShift) @r^s70{}
mask|=1; K,6{c^qf
key=Key_Table[m_Key.GetCurSel()]; 6b%IPbb
if(bRegistered){ 7[mP@ {
DeleteHotkey(GetSafeHwnd(),cKey,cMask); W56VA>ia
bRegistered=FALSE; yVQW|D0,j
} cs_
cMask=mask; Sb?Ua*(L:
cKey=key; L7n G5i
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >$yA
,N
return bRegistered; ?Q$a@)x#
} V2xvuDHI
c<lEFk!g
四、小结 R^=v&c{@
WgG$ r
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。