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:
,jtaTG.>
>)u{%@Rcy{ 一、实现方法
OHW|?hI=[ @ULWVS#t2 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:
/2hRLyeAZ Q&+)Kp]A #pragma data_seg("shareddata")
?RIf0;G HHOOK hHook =NULL; //钩子句柄
h@'CmIZc UINT nHookCount =0; //挂接的程序数目
34[TM 3L]. static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
*-(o. !#1 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Ycx}FYTY static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
xtIF)M static int KeyCount =0;
#_`qbIOAj static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
s? Xgo&rS_ #pragma data_seg()
`iN\@)E Jf0i$ 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。
|:Maa6(W 0*9xau{( 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:
ho B[L}<c nz'6^D7`r BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
G<$8g-O;D cKey,UCHAR cMask)
D%LYQ
{
Sv0?_3C BOOL bAdded=FALSE;
$.:x3TsA for(int index=0;index<MAX_KEY;index++){
}~NXiUe if(hCallWnd[index]==0){
^nNpT!o hCallWnd[index]=hWnd;
CEBG9[| HotKey[index]=cKey;
`m8WLj HotKeyMask[index]=cMask;
Pa+_{9 bAdded=TRUE;
`u
R`O9)e KeyCount++;
1c429&- break;
WRA L/ }
_%Ua8bR$ }
C"mWO Y2] return bAdded;
lN8l71N^ }
1
?Zw //删除热键
kM1N4N7 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Cz$q"U {
Lfdg5D5.P BOOL bRemoved=FALSE;
,nCvA%B! for(int index=0;index<MAX_KEY;index++){
CWRB/WH: if(hCallWnd[index]==hWnd){
+Mhk<A[s if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
%W2U$I5 hCallWnd[index]=NULL;
f[.'V1 HotKey[index]=0;
rlawH}1b HotKeyMask[index]=0;
~Hv>^u
Mh bRemoved=TRUE;
hW/Ve'x[ KeyCount--;
(i1x< break;
WHOX<YJs }
Iz-mUD0; }
Q<g>WNb }
/Hq return bRemoved;
~tV7yY|zr }
6,M$TA ;+|Z5+7!6 GA/afc,V DLL中的钩子函数如下:
'Ha> >2M dKC*QHU LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
5*-RIs! 2 {
W[a"&,okqO BOOL bProcessed=FALSE;
sf[|8}( if(HC_ACTION==nCode)
)G?\{n- {
pwS"BTZ if((lParam&0xc0000000)==0xc0000000){// 有键松开
GCiG50Z= switch(wParam)
u*W! !(P/ {
zJl;|E". case VK_MENU:
*]h"J] MaskBits&=~ALTBIT;
2<p@G#( break;
k9<UDg_ Y case VK_CONTROL:
_x3=i\O, MaskBits&=~CTRLBIT;
^);M}~ break;
%n8CK-> case VK_SHIFT:
u0,QsD)_X0 MaskBits&=~SHIFTBIT;
)ZBNw{nh break;
n-],!pL^ default: //judge the key and send message
?daxb break;
TF5jTpGq }
-K(d]-yv for(int index=0;index<MAX_KEY;index++){
Zlh 2qq if(hCallWnd[index]==NULL)
D)DD 6 continue;
S@S4<R1{\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ys>n%24qP {
bKK'U4 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
/Z!$bD bProcessed=TRUE;
5/i/.
0?n }
w0Ex} }
~Dz:n]Vk/ }
}o7- 3!{L! else if((lParam&0xc000ffff)==1){ //有键按下
/]j{P4 switch(wParam)
gPc1oc( {
:4Nv6X61 case VK_MENU:
p8@8b " MaskBits|=ALTBIT;
<uJ
{>~ break;
}!> \Ja<\ case VK_CONTROL:
r79P|)\ MaskBits|=CTRLBIT;
S9
$t9o break;
`GY3H3B case VK_SHIFT:
M*D_pn& MaskBits|=SHIFTBIT;
Tp{jR< break;
+!px+*)bW default: //judge the key and send message
o<Mccj break;
K@xMPB8in }
K5T1dBl,0 for(int index=0;index<MAX_KEY;index++){
X=Ar"Dx}}s if(hCallWnd[index]==NULL)
UBM#~~sM continue;
'[%Pdd]!
E if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
3`{;E{ {
j6~`C
?( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
#a~BigZ[G bProcessed=TRUE;
XOQ0(e6 }
f(eXny@Y }
rP2h9Cb }
X[H .t$w5A if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
7-n HPDp' for(int index=0;index<MAX_KEY;index++){
3`vKEThY) if(hCallWnd[index]==NULL)
K@%T5M4j continue;
km5gO|V>m if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
SqRM*Cf= SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
2-N7%]h //lParam的意义可看MSDN中WM_KEYDOWN部分
mwsBj) }
a73VDQr I }
.m8l\h^3 }
KnA BFH return CallNextHookEx( hHook, nCode, wParam, lParam );
ub9[!}r't }
"DGap*=J
4|I;z 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:
Ja4M@z &v1E)/q{Z BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
}qoId3iY!7 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
r(Z?Fs/ Gf9sexn]l 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:
59SL
mj Bhx.q,X LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
mLkp*?sfC {
*y7Yf7 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
^W%F?#ELN2 {
vO~w~u5 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
RrCG(Bh SaveBmp();
3fpaTue|x return FALSE;
]+a~/ }
I3r")}P …… //其它处理及默认处理
q UmSB"#Z }
~xc/Dsb$ &[j9Up' C@t,oDU# 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。
xr@;w8X`^ V_m!<sr ( 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。
60nP'xfR a3w6&e` 二、编程步骤
K;rgLj0m 8%YyxoCH 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";
M=ag\1S&ZF fK]%*i_" 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
CMbID1M3 |.yS~XFJS 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;
4I2:"CK06 G4'Ee5(o 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;
lfCr`[!E ;/wH/!b 5、 添加代码,编译运行程序。
'm|T"Ym~ bo<.pK$ 三、程序代码
IgwHC0W &nVekE:! ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
D4y!l~_,%M #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
+HWFoK #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Whp`\E<< #if _MSC_VER > 1000
jck(cc=R #pragma once
{g`!2" #endif // _MSC_VER > 1000
+]-'{%-zK #ifndef __AFXWIN_H__
ia;osqW #error include 'stdafx.h' before including this file for PCH
L >"O[@ #endif
m{Uh{G$ #include "resource.h" // main symbols
n/*" 2 class CHookApp : public CWinApp
qa@;S,lp {
5Uy*^C7M^ public:
UY({[?Se CHookApp();
LY)Wwl*wc // Overrides
S *J{ // ClassWizard generated virtual function overrides
J@<f* //{{AFX_VIRTUAL(CHookApp)
%(6+{'j~# public:
W)]&G}U< virtual BOOL InitInstance();
p$x>I3C(\ virtual int ExitInstance();
J"GsdLG.- //}}AFX_VIRTUAL
qLxcr/fK //{{AFX_MSG(CHookApp)
VB4V[jraCF // NOTE - the ClassWizard will add and remove member functions here.
T|h!06 // DO NOT EDIT what you see in these blocks of generated code !
}S')!3[G //}}AFX_MSG
*>zOWocxD DECLARE_MESSAGE_MAP()
$0P16ZlPC };
D$H&^,?N LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
''q;yKpaz BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Eul3 {+] BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
s 72yu} BOOL InitHotkey();
&FOq c BOOL UnInit();
ht6}v<x.eA #endif
6(htpT%J CKe72OC //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
HN/YuP03[ #include "stdafx.h"
CH!\uK22 #include "hook.h"
nm%qm #include <windowsx.h>
m1]/8{EC7 #ifdef _DEBUG
>c
Tt2v #define new DEBUG_NEW
3$K[(>s #undef THIS_FILE
[okV[7 static char THIS_FILE[] = __FILE__;
Kx,X{$Pe #endif
sm G?y~ #define MAX_KEY 100
L[Y$ `e{zd #define CTRLBIT 0x04
XUR#| #define ALTBIT 0x02
&YD+s%OL #define SHIFTBIT 0x01
;O~FiA~`c #pragma data_seg("shareddata")
>j ].`T HHOOK hHook =NULL;
s?1Aj< UINT nHookCount =0;
hv>Xr=RE static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
%"
mki> static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
lWJYT<kt static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
x30|0EHYl[ static int KeyCount =0;
`}uM91; static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
d!Y%7LmSE@ #pragma data_seg()
yV L >Ie/ HINSTANCE hins;
.8ikcs void VerifyWindow();
5\}Y=Pa BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
%RF$Y=c'C //{{AFX_MSG_MAP(CHookApp)
wouk~>Jft // NOTE - the ClassWizard will add and remove mapping macros here.
n!X%i+|4x // DO NOT EDIT what you see in these blocks of generated code!
sRcS-Yw[S //}}AFX_MSG_MAP
B>d49(jy END_MESSAGE_MAP()
~p{YuW[e ]{{%d4 CHookApp::CHookApp()
.}+3A~ {
fwzyCbks // TODO: add construction code here,
Bonj K# // Place all significant initialization in InitInstance
=F/ R*5:T }
H>]*<2(=- zp'hA CHookApp theApp;
?;5/"/i LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
rAW7Zp~KK {
;H71A[M
T BOOL bProcessed=FALSE;
RhF<{U. if(HC_ACTION==nCode)
yU7XX+cB7 {
ND=JpVkvZ? if((lParam&0xc0000000)==0xc0000000){// Key up
F &5iA\ switch(wParam)
aYpc\jJ {
C9k"QPE case VK_MENU:
\7xc*v [ MaskBits&=~ALTBIT;
Oo(xYy break;
NL-PQ%lUA case VK_CONTROL:
"la0@/n MaskBits&=~CTRLBIT;
XknNb{. r break;
.Q@]+&`|}i case VK_SHIFT:
F>[^m Xw MaskBits&=~SHIFTBIT;
)G]J@36 break;
Xf{p>-+DL default: //judge the key and send message
\ E5kpm break;
"iK'O =M }
0lYP!\J3]% for(int index=0;index<MAX_KEY;index++){
|rhB@k if(hCallWnd[index]==NULL)
i^ILo,Q continue;
RCK* ?\m5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Y}yh6r;i {
.S=|ZP+ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
!rqs!-cCQ bProcessed=TRUE;
M
0G`P1o }
8/,s8u }
,5t_}d|3C= }
@ZV>Cl@%2 else if((lParam&0xc000ffff)==1){ //Key down
- \ew,y switch(wParam)
?,hGKSC {
z
[u!C/ case VK_MENU:
N5cC!K MaskBits|=ALTBIT;
l#+@!2z break;
|r+hj<K case VK_CONTROL:
i \lr
KA MaskBits|=CTRLBIT;
{Q]7!/>> break;
Z.aeE*Hs$ case VK_SHIFT:
Kh&a# ~c MaskBits|=SHIFTBIT;
P^lRJB<$Q break;
S4(?=,^- default: //judge the key and send message
,L>{(Q) break;
TDg<&ND3 }
XC/M:2$ for(int index=0;index<MAX_KEY;index++)
6B>*v`T: {
NJoHrhC=' if(hCallWnd[index]==NULL)
QOJ5 continue;
|
ObA=[j if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
NW21{}=4 {
)B~{G\jS SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
}>YEtA bProcessed=TRUE;
^QHgc_oDm }
pMUUF5 }
6BXZGE }
pm= s if(!bProcessed){
H6$pA^ for(int index=0;index<MAX_KEY;index++){
yB;K|MXy? if(hCallWnd[index]==NULL)
=3;!
5P continue;
"Nq5FcS9 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
vsI|HxpyC, SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
4Xn-L&0z }
iZ ;562Mo }
({C|(v9C7 }
=fhRyU:C[z return CallNextHookEx( hHook, nCode, wParam, lParam );
D42!# }
8<EU|/O f=4q]y#& X BOOL InitHotkey()
6"+bCx0: {
gG(9&}@( if(hHook!=NULL){
#.OCoc nHookCount++;
"88<{x L return TRUE;
ah!RQ2hDrV }
2&o3OKt else
|hu9)0P hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
F22]4DLHO if(hHook!=NULL)
H}1XK|K3#H nHookCount++;
UM+g8J{$*; return (hHook!=NULL);
k>\s6 }
6?0QzSpfC# BOOL UnInit()
(|y@ftr@ {
`n e9&+ if(nHookCount>1){
nqcD#HUv nHookCount--;
Et)j6xz/F return TRUE;
reoCyP\!! }
7V~
gqum BOOL unhooked = UnhookWindowsHookEx(hHook);
?U~`'^@ if(unhooked==TRUE){
lOIf4 nHookCount=0;
-li;w
tCS hHook=NULL;
hN;$'%^ }
Thp!X/2O` return unhooked;
U
owbk: }
$1D>}5Ex ?SoRi</1 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
6bbzgULl {
[;7$ 'lr%D BOOL bAdded=FALSE;
p,OB;Ncf/ for(int index=0;index<MAX_KEY;index++){
PV/ hnVUl if(hCallWnd[index]==0){
&=-{adm hCallWnd[index]=hWnd;
G\r>3Ys HotKey[index]=cKey;
t@BhosR- HotKeyMask[index]=cMask;
tW3Nry bAdded=TRUE;
o{K#LP KeyCount++;
1tCe#*|95 break;
nqib`U@" }
U+ief?;4F }
{'f=*vMI return bAdded;
MrS~u }
l;;"v) C8 r@H7J 5<Y- BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
cbX< {
KMV&c BOOL bRemoved=FALSE;
>=L<3W1 for(int index=0;index<MAX_KEY;index++){
a0B,[i if(hCallWnd[index]==hWnd){
-[5yp 2F-{ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
g; ZVoD hCallWnd[index]=NULL;
m<:g\_< HotKey[index]=0;
J|WkPv2 HotKeyMask[index]=0;
Uv=hxV[7y bRemoved=TRUE;
|-vn,zpe KeyCount--;
f9b[0L break;
X&|y| }
/A%31WE&1 }
DI:"+KMq{ }
roWg~U(S return bRemoved;
o~p%ODH }
6^Ax3#q IdL~0;W7 void VerifyWindow()
ZG-[Gz {
ZfWF2%]< for(int i=0;i<MAX_KEY;i++){
X}j_k=, C if(hCallWnd
!=NULL){ dWDf(SS
if(!IsWindow(hCallWnd)){ }!5+G:JAh
hCallWnd=NULL; ]1i1_AR'`
HotKey=0; XZ1<sm8t."
HotKeyMask=0; U P e@>
KeyCount--; |gJI}"T
} <a$'tw-8
} uI_h__
} 7V7iIbi
} .s>PDzM$
w!/se;_H+w
BOOL CHookApp::InitInstance() .c2Zr|X
{ ZHOh(
AFX_MANAGE_STATE(AfxGetStaticModuleState()); # F|w_P
hins=AfxGetInstanceHandle(); 8j&LU,
InitHotkey(); 'wP\VCL2>
return CWinApp::InitInstance(); a*KJjl?k
} H7R6Ljd?&S
dfA4OZ&
int CHookApp::ExitInstance() c=\H&x3X
{ .VfBwTh7q8
VerifyWindow(); OLgW.j:Ag
UnInit(); [n9X5qG~
return CWinApp::ExitInstance(); c27\S?\
Jd
} AU/L_hg
F\hU
V[
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file b:>t1S Ul
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) FaE,rzn)iD
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ LuUfdzH
#if _MSC_VER > 1000 KZt4 dr
#pragma once xO` O$ie
#endif // _MSC_VER > 1000 Oxhc!9F
dQH9NsV7g
class CCaptureDlg : public CDialog P[bj{lo
{ XCU>b[Cj,
// Construction (cEjC`]
public: Q GQ}I
BOOL bTray; uf&Ke
k,
BOOL bRegistered; K
trR+:
BOOL RegisterHotkey(); 0 P-eC|0
UCHAR cKey; C%\.
UCHAR cMask; p$OkWSi~
void DeleteIcon(); f<aJiVP
void AddIcon(); ^SH8*7l7
UINT nCount; BjyGk+A
void SaveBmp(); 1me16 5y<B
CCaptureDlg(CWnd* pParent = NULL); // standard constructor *wVWyC
// Dialog Data f6-OR]R5
//{{AFX_DATA(CCaptureDlg) ,Z6\%:/
enum { IDD = IDD_CAPTURE_DIALOG }; @{y[2M} %]
CComboBox m_Key; is [p7-
BOOL m_bControl; 9H4NvB{
BOOL m_bAlt; 7Eett)4
BOOL m_bShift; xxC2F:Q?U
CString m_Path; ?3{:[*
CString m_Number; ]M#OS$_O@
//}}AFX_DATA )kiC/Y}k
// ClassWizard generated virtual function overrides [#Y7iN&
//{{AFX_VIRTUAL(CCaptureDlg) &>&UqWL
public: )"Vd8*e
virtual BOOL PreTranslateMessage(MSG* pMsg); ,Rh6(I
protected: \ZPmPu9^(
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }Kc03Ue`%e
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 8LM 91
//}}AFX_VIRTUAL n_X)6 s
// Implementation ?$&iVN^UA
protected: iO_6>&(
HICON m_hIcon; kX)Xo`^Ys
// Generated message map functions Y
&"rf
//{{AFX_MSG(CCaptureDlg) TUV&9wKXo
virtual BOOL OnInitDialog(); "TboIABp:H
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); G`1FD
afx_msg void OnPaint(); [b<AQFh<c
afx_msg HCURSOR OnQueryDragIcon(); `96PY!$u
virtual void OnCancel(); P5^<c\Mr,Y
afx_msg void OnAbout(); C0$KpUB
afx_msg void OnBrowse();
*[^[!'kT&
afx_msg void OnChange(); hLf<-NM
//}}AFX_MSG 7P$>T
DECLARE_MESSAGE_MAP() vUU)zZB~
}; @L ,hA
v^
#endif 4)XZ'~|
SZ[,(h
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Fs,#d%4 @%
#include "stdafx.h" ?UGA-^E1
#include "Capture.h" bdUe,2Yi n
#include "CaptureDlg.h" 93aRWEu3
#include <windowsx.h> `/0S]?a.{B
#pragma comment(lib,"hook.lib") ;Iu}Q-b*
#ifdef _DEBUG ,J3s1 ]~^
#define new DEBUG_NEW <.yL&$9
#undef THIS_FILE yRt>7'@X
static char THIS_FILE[] = __FILE__; ,xeJf6es
#endif ;$Q&2}L[
#define IDM_SHELL WM_USER+1 DiLZ5^`]
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [aF^ D;o
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); mDT"%I"4j
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; <:rbK9MIl
class CAboutDlg : public CDialog bm+
#OI
{ E0Y>2HOuL
public: xy$agt>j>
CAboutDlg(); Ki DL]2
// Dialog Data XpLK0YI
//{{AFX_DATA(CAboutDlg) r#xq 8H=_m
enum { IDD = IDD_ABOUTBOX }; /d\#|[S
//}}AFX_DATA )@O80uOFh
// ClassWizard generated virtual function overrides M@=eW Z<
//{{AFX_VIRTUAL(CAboutDlg) !\ckUMZ\
protected: ^-yEb\\i
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support pSvqGJU3
//}}AFX_VIRTUAL vl{G;[6
// Implementation ?!4xtOA
protected: V#Hg+\{d
//{{AFX_MSG(CAboutDlg) d 18>0R
//}}AFX_MSG };z[x2l^
DECLARE_MESSAGE_MAP() &u@<0 1=
}; B?cn5
$ MN1:ih
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) &r)i6{w81
{ dP0%<Q|
//{{AFX_DATA_INIT(CAboutDlg) OcBKn=8
//}}AFX_DATA_INIT t[ Zoe+&
} {|;5P.,l
,W!v0*uxp&
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >*hY1@N1
{ d0Jaa1b~O
CDialog::DoDataExchange(pDX); f""+jc1
//{{AFX_DATA_MAP(CAboutDlg) cM= ?{W7~
//}}AFX_DATA_MAP |NsrO8H
}
9z9EK'g
w[bhm$SX]B
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^HYrJr$y
//{{AFX_MSG_MAP(CAboutDlg) =%O@%v
// No message handlers hd@ >p.
//}}AFX_MSG_MAP BO3#*J5S\
END_MESSAGE_MAP() |V 3AA
a=m7pe^
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 0\N n.x%
: CDialog(CCaptureDlg::IDD, pParent) :slVja$e
{ -/k;VT|
//{{AFX_DATA_INIT(CCaptureDlg) ]~!jf
m_bControl = FALSE; yt+"\d
m_bAlt = FALSE; tdl Y
m_bShift = FALSE; <d$L}uQwg
m_Path = _T("c:\\"); #fy#G}c
m_Number = _T("0 picture captured."); ?-y!FD}m&
nCount=0; \
nIz5J}3
bRegistered=FALSE; LZ97nvK
bTray=FALSE; km)5?
//}}AFX_DATA_INIT I(cy<ey+e
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 HR/"Nwr
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); "o=*f/M
} A1mxM5N
)@X
`B d
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Vz"Ja
{ K,VN?t<h
CDialog::DoDataExchange(pDX);
)N8[@
//{{AFX_DATA_MAP(CCaptureDlg) 5iG+O4n%
DDX_Control(pDX, IDC_KEY, m_Key); Hq[vh7Lux
DDX_Check(pDX, IDC_CONTROL, m_bControl); 'g4t !__
DDX_Check(pDX, IDC_ALT, m_bAlt); 1qR[&=/
DDX_Check(pDX, IDC_SHIFT, m_bShift); )<.BN
p
DDX_Text(pDX, IDC_PATH, m_Path); M:!Twz$
DDX_Text(pDX, IDC_NUMBER, m_Number); ~F</s.
//}}AFX_DATA_MAP 'pJ46"D@m
} qMk"i@"
`qNhB\
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) lcv&/ A
//{{AFX_MSG_MAP(CCaptureDlg) RY>BP[h
ON_WM_SYSCOMMAND() @+9x8*~S'
ON_WM_PAINT() _;;'/rs
j
ON_WM_QUERYDRAGICON() ?f\;z<e|
ON_BN_CLICKED(ID_ABOUT, OnAbout) Slk__eC
ON_BN_CLICKED(IDC_BROWSE, OnBrowse)
KKfC^g
ON_BN_CLICKED(ID_CHANGE, OnChange) E5#Dn.!~
//}}AFX_MSG_MAP %[x oA)0!
END_MESSAGE_MAP() `30og]F0YJ
V!sT2
BOOL CCaptureDlg::OnInitDialog() K%XQdMv
{ $yZ(c#L
CDialog::OnInitDialog(); ;W/K7}
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); n^svRM]eQ
ASSERT(IDM_ABOUTBOX < 0xF000); 8IAf9
CMenu* pSysMenu = GetSystemMenu(FALSE); zfAkWSY
if (pSysMenu != NULL) q,ry3Nr4n
{ k63]Qf=5?N
CString strAboutMenu; +w(sDH~kd
strAboutMenu.LoadString(IDS_ABOUTBOX); jLANv{"
if (!strAboutMenu.IsEmpty()) w3l+BUn:X
{ P4M*vZq)
pSysMenu->AppendMenu(MF_SEPARATOR); FD}hw9VyF@
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); D[m+=-
} P,$|.pd'
} k *a?Ey$
SetIcon(m_hIcon, TRUE); // Set big icon e~Oge
SetIcon(m_hIcon, FALSE); // Set small icon N W/RQ(
m_Key.SetCurSel(0); PRs[!EB6
RegisterHotkey(); wkO8
CMenu* pMenu=GetSystemMenu(FALSE); ,?OV39h
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); k/"^W.B aj
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); x1gf o!BN
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ?B)jnBh|
return TRUE; // return TRUE unless you set the focus to a control 9q?\F
} sHk,#EsKH
v<*ga7'S
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 1eg/<4]hA
{ CXb-{|I}d
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ?!N@%R>5rN
{ hdi/ k!9[\
CAboutDlg dlgAbout; d"E@e21
dlgAbout.DoModal(); @~4Q\^;NX
} E3pnu.;U:_
else mfYY?]A*+
{ )1PZ#
CDialog::OnSysCommand(nID, lParam); X3C"A|HE9
} XHX\+&6
} j{.P'5e@pZ
$VWeo#b
void CCaptureDlg::OnPaint() H5L~[\
5t
{ VtNY~
if (IsIconic()) :YL`GSl
{ Ig9gGI,
CPaintDC dc(this); // device context for painting FME&vUh/
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); px@:t}
// Center icon in client rectangle q,#j
*
int cxIcon = GetSystemMetrics(SM_CXICON); [D]9M"L,vQ
int cyIcon = GetSystemMetrics(SM_CYICON); HFJna2B`
CRect rect; 3DNw=Ic0k
GetClientRect(&rect); eYQq@lrWv
int x = (rect.Width() - cxIcon + 1) / 2; t0[H_
int y = (rect.Height() - cyIcon + 1) / 2; rf2+~B{$,
// Draw the icon y7K&@Y
dc.DrawIcon(x, y, m_hIcon); hAPWEh^
} ^8,Y1r9`$
else X8F@U ^@
{ 8Ol#-2>k$
CDialog::OnPaint(); SF$]{
X
} -P;_j,~U
} NWuJ&+gcO5
J&64tQl*
HCURSOR CCaptureDlg::OnQueryDragIcon() bCM&Fe0GM
{ 8hx4s(1!
return (HCURSOR) m_hIcon; 0!WF,)/T7i
} 6g/ <FM
LX%K*nlj
void CCaptureDlg::OnCancel() J 3oEN'8S
{ ubC(%Y_k
if(bTray) `yjHLg
DeleteIcon(); ]9xuLJ)
CDialog::OnCancel(); 6m#V=4e*
} RUJkfi=$
/Iwnl
void CCaptureDlg::OnAbout() ()< E?D=
{ Cu5fp.OS7
CAboutDlg dlg; ^DL}J>F9G
dlg.DoModal(); ^4Nk13
} G_GPnKdd
7M#eR8*[se
void CCaptureDlg::OnBrowse() ?(9/V7HQ.5
{ s>=DfE-;"
CString str; _j$"fg
BROWSEINFO bi; 9H@I<`qGC
char name[MAX_PATH]; R3nCk-Dq
ZeroMemory(&bi,sizeof(BROWSEINFO)); ^/|agQ7D2
bi.hwndOwner=GetSafeHwnd(); P8tpbdZE-
bi.pszDisplayName=name; l+6y$2QR
bi.lpszTitle="Select folder"; }T@^wY_Ow
bi.ulFlags=BIF_RETURNONLYFSDIRS; o,| LO$~
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9(;5!q,Gsg
if(idl==NULL) ~F?vf@k
return; /az}<r8
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); .A;e`cKb
str.ReleaseBuffer(); _[zZm*
m_Path=str; X$o$8s
if(str.GetAt(str.GetLength()-1)!='\\') oF1{/ERS
m_Path+="\\"; Kjw4,z%\94
UpdateData(FALSE); `1|#Za~e
} *R] Ob9X
.Dn.|A
void CCaptureDlg::SaveBmp() pmm?Fq!s=
{ U} EaV<
CDC dc; ^Eu]i
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 4uQ\JD(*Eu
CBitmap bm; {!?
@u?M
int Width=GetSystemMetrics(SM_CXSCREEN); !N\<QRb\q
int Height=GetSystemMetrics(SM_CYSCREEN); wul$lJ?tE
bm.CreateCompatibleBitmap(&dc,Width,Height); K?;_T$^K
CDC tdc; T&M*sydA
tdc.CreateCompatibleDC(&dc); ?C('
z7
CBitmap*pOld=tdc.SelectObject(&bm); grvm2`u
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); XILB>o.^3
tdc.SelectObject(pOld); Gm,vLs9H$T
BITMAP btm; }2WscxL
bm.GetBitmap(&btm); ~r/"w'dB
DWORD size=btm.bmWidthBytes*btm.bmHeight; 3AKT>Wy =
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 'r&az BO
BITMAPINFOHEADER bih; G,tJ\xMw8
bih.biBitCount=btm.bmBitsPixel; N_dHPa
bih.biClrImportant=0;
Bw;gl^:UG
bih.biClrUsed=0; r57&F`{
bih.biCompression=0; 1&zvf4
bih.biHeight=btm.bmHeight; cT2&nZ
bih.biPlanes=1; )gOVnA/M
bih.biSize=sizeof(BITMAPINFOHEADER); lSMv9:N
bih.biSizeImage=size; bve_*7CEM
bih.biWidth=btm.bmWidth; 4*k>M+o/C4
bih.biXPelsPerMeter=0; ~UrKyA
bih.biYPelsPerMeter=0; #w%d
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); -s?f <f{
static int filecount=0; =NHE_4/p
CString name; rF9|xgFK
name.Format("pict%04d.bmp",filecount++); [}xVz"8 V
name=m_Path+name; r]e1a\)r
BITMAPFILEHEADER bfh; ,2t|(V*"&
bfh.bfReserved1=bfh.bfReserved2=0; $8/=@E{51
bfh.bfType=((WORD)('M'<< 8)|'B'); baLO~C
bfh.bfSize=54+size; [NG~FwpRf
bfh.bfOffBits=54; ~q5aMy d<
CFile bf; UQ0Sfu
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ u/wWP4'$J@
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Hrjry$t/J
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); `SFA`B)[5@
bf.WriteHuge(lpData,size); AcZ{B<
bf.Close(); }BF!!*
nCount++; bQU{)W
} |PGF g0li
GlobalFreePtr(lpData); 1NHiW
v
if(nCount==1) I5nxY)v
m_Number.Format("%d picture captured.",nCount); OyI?P_0u
else ` ,lm:x+(0
m_Number.Format("%d pictures captured.",nCount); YmrrZ&]q
UpdateData(FALSE); d=`a-R0
} L/ L#[
z7vc|Z|
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5j8aMnv s
{ /
.wO<l=
if(pMsg -> message == WM_KEYDOWN) AnF"+<
{ Sb2hM~
if(pMsg -> wParam == VK_ESCAPE) /+V}.
return TRUE; s ;3k#-w
if(pMsg -> wParam == VK_RETURN) ?*oBevUnCY
return TRUE;
6tx5{Xl-o
} 4*AkUkP:T
return CDialog::PreTranslateMessage(pMsg); NO)Hi)$X6Y
} ]=gNA
tTjadnX
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) fwF&V^Dy
{ Mh=yIx</
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ /M,C%.-
SaveBmp(); yL2sce[
return FALSE; ;;4>vF#*
} '99rXw
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Zz,j,w0 Z
CMenu pop; d}RU-uiW
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); O]-)?y/
CMenu*pMenu=pop.GetSubMenu(0); F"-u8in`
pMenu->SetDefaultItem(ID_EXITICON); dd+hX$,
CPoint pt; H{)DI(,Y^P
GetCursorPos(&pt); l|kGp~
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ftb .CPWI
if(id==ID_EXITICON) T!f+H?6
DeleteIcon(); 8"'Z0
Ey
else if(id==ID_EXIT) xK*G'3Ge
OnCancel(); D(;jv= "/
return FALSE; X-,mNvz
} !_?K(X~/
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1Yk!R9.
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {"dvU"y)\
AddIcon(); B*OEG*t
return res; >='y+68
} 0?$jC-@k:
/` ;rlH*
void CCaptureDlg::AddIcon() ;L*Ku'6Mt
{ ]>9[}'u
NOTIFYICONDATA data; .4[\%r\i
data.cbSize=sizeof(NOTIFYICONDATA); _J,lF-,
CString tip; #\zC|%2+z
tip.LoadString(IDS_ICONTIP); }'KHF0
data.hIcon=GetIcon(0);
vE~>9
data.hWnd=GetSafeHwnd(); #+"1">l
strcpy(data.szTip,tip);
|F}6Zv
data.uCallbackMessage=IDM_SHELL; o?{-K-'B$
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; [g/ &%n0^
data.uID=98; 1zc aI^e#
Shell_NotifyIcon(NIM_ADD,&data); $etw'c0
ShowWindow(SW_HIDE); +s j2C
bTray=TRUE; .),Fdrg
} 1!S*z^LGl
;f!}vo<;
void CCaptureDlg::DeleteIcon() (y^svXU}a
{ SG4)kQ
NOTIFYICONDATA data; ?wi^R:2|j
data.cbSize=sizeof(NOTIFYICONDATA); gcA,u)z}R
data.hWnd=GetSafeHwnd(); kgb:<{pJ
data.uID=98; Fv} Uq\v[
Shell_NotifyIcon(NIM_DELETE,&data); @$7'{*
ShowWindow(SW_SHOW); tqFE>ojlI
SetForegroundWindow(); EXbaijHQG
ShowWindow(SW_SHOWNORMAL); :
GdLr
bTray=FALSE; 8C=8Wjm
} gq7l>vT.
HhZ>/5'(
void CCaptureDlg::OnChange() g=na3^PL6
{ (|2:^T+
RegisterHotkey(); oWLv-{08
} ^Q#g-"b
B9:
i.rQ
BOOL CCaptureDlg::RegisterHotkey() 0woLB#v9
{ Mp3nR5@d$
UpdateData(); K'c[r0Ew
UCHAR mask=0; Vr7L9%/wg
UCHAR key=0; I_s* pT
if(m_bControl) 4n0Iw I
mask|=4; Krd0Gc~\|
if(m_bAlt) wBlo2WY
mask|=2; wZg~k\_lF
if(m_bShift) {00Qg{;K|
mask|=1; 8zO;=R A7%
key=Key_Table[m_Key.GetCurSel()]; X/f?=U
if(bRegistered){ 8b:GyC5L
DeleteHotkey(GetSafeHwnd(),cKey,cMask); n`X}&(O
bRegistered=FALSE; S*NeS#!v
} szs.B|3X@*
cMask=mask; {O!B8a
cKey=key; 4*&2D-8<K
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Tg@:mw5
return bRegistered; 7Tc^}Q
} cz41<SFL
MMy\u) 4
四、小结 -KL5sK
-PCFOm"
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。